Difference between revisions of "DIY E-Bike Battery"

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(added 16-month self-discharge voltages)
(→‎Individual Cell Measurements: added capacity measurements!)
 
(One intermediate revision by one user not shown)
Line 32: Line 32:
 
=== Individual Cell Measurements ===
 
=== Individual Cell Measurements ===
  
−
{| class="wikitable"
+
{| class="wikitable" style="text-align: right;"
 
|+ K2 26650 Li-Ion Cells
 
|+ K2 26650 Li-Ion Cells
 
! scope="col"| Serial Number
 
! scope="col"| Serial Number
Line 38: Line 38:
 
! scope="col"| Out-Of-The-Box Voltage
 
! scope="col"| Out-Of-The-Box Voltage
 
! scope="col"| Self-Discharge Voltage
 
! scope="col"| Self-Discharge Voltage
 +
! scope="col"| Capacity (watt-hours)
 
! scope="col"| Remarks <!-- This column should be right-most. -->
 
! scope="col"| Remarks <!-- This column should be right-most. -->
 
<!-- ================ START OF ROW 00 ================ -->
 
<!-- ================ START OF ROW 00 ================ -->
Line 45: Line 46:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.682
 
|-
 
|-
 
| PH190223-132415
 
| PH190223-132415
Line 50: Line 52:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.770
 
|-
 
|-
 
| PH190223-132362
 
| PH190223-132362
Line 55: Line 58:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.808
 
|-
 
|-
 
| PH190223-132351
 
| PH190223-132351
Line 60: Line 64:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.898
 
|-
 
|-
 
| PH190223-132270
 
| PH190223-132270
Line 65: Line 70:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.932
 
|-
 
|-
 
| PH190223-132286
 
| PH190223-132286
Line 70: Line 76:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.876
 
|-
 
|-
 
| PH190223-132393
 
| PH190223-132393
Line 75: Line 82:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.802
 
|-
 
|-
 
| PH190223-132397
 
| PH190223-132397
Line 80: Line 88:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.945
 
|-
 
|-
 
| PH190223-132328
 
| PH190223-132328
Line 85: Line 94:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.943
 
|-
 
|-
 
| PH190223-132317
 
| PH190223-132317
Line 90: Line 100:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.862
 
<!-- ================ START OF ROW 01 ================ -->
 
<!-- ================ START OF ROW 01 ================ -->
 
|-
 
|-
Line 96: Line 107:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.824
 
|-
 
|-
 
| PH190223-132442
 
| PH190223-132442
Line 101: Line 113:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.835
 
|-
 
|-
 
| PH190223-132426
 
| PH190223-132426
Line 106: Line 119:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.908
 
|-
 
|-
 
| PH190223-132378
 
| PH190223-132378
Line 111: Line 125:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.915
 
|-
 
|-
 
| PH190223-132265
 
| PH190223-132265
Line 116: Line 131:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.880
 
|-
 
|-
 
| PH190223-132281
 
| PH190223-132281
Line 121: Line 137:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.873
 
|-
 
|-
 
| PH190223-132457
 
| PH190223-132457
Line 126: Line 143:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.876
 
|-
 
|-
 
| PH190223-132424
 
| PH190223-132424
Line 131: Line 149:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.640
 
|-
 
|-
 
| PH190223-132392
 
| PH190223-132392
Line 136: Line 155:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.710
 
|-
 
|-
 
| PH190223-132344
 
| PH190223-132344
Line 141: Line 161:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.737
 
<!-- ================ START OF ROW 02 ================ -->
 
<!-- ================ START OF ROW 02 ================ -->
 
|-
 
|-
 
| PH190223-132367
 
| PH190223-132367
 
| 020
 
| 020
−
| 0.00 😭
+
| 0.00
 
| 3.21
 
| 3.21
 +
| 8.886
 
|-
 
|-
 
| PH190223-132350
 
| PH190223-132350
Line 152: Line 174:
 
| 3.29
 
| 3.29
 
| 3.34
 
| 3.34
 +
| 10.678
 
|-
 
|-
 
| PH190223-132334
 
| PH190223-132334
Line 157: Line 180:
 
| 3.29
 
| 3.29
 
| 3.34
 
| 3.34
 +
| 10.845
 
|-
 
|-
 
| PH190223-132233
 
| PH190223-132233
Line 162: Line 186:
 
| 3.29
 
| 3.29
 
| 3.34
 
| 3.34
 +
| 10.792
 
|-
 
|-
 
| PH190223-132269
 
| PH190223-132269
Line 167: Line 192:
 
| 3.29
 
| 3.29
 
| 3.34
 
| 3.34
 +
| 10.758
 
|-
 
|-
 
| PH190223-132462
 
| PH190223-132462
Line 172: Line 198:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.813
 
|-
 
|-
 
| PH190223-132398
 
| PH190223-132398
 
| 026
 
| 026
−
| 3.19 🙁
+
| 3.19
 
| 3.32
 
| 3.32
 +
| 9.369
 
|-
 
|-
 
| PH190223-132414
 
| PH190223-132414
Line 182: Line 210:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.759
 
|-
 
|-
 
| PH190223-132413
 
| PH190223-132413
Line 187: Line 216:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.788
 
|-
 
|-
 
| PH190223-132333
 
| PH190223-132333
Line 192: Line 222:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.646
 
<!-- ================ START OF ROW 03 ================ -->
 
<!-- ================ START OF ROW 03 ================ -->
 
|-
 
|-
Line 198: Line 229:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.740
 
|-
 
|-
 
| PH190223-132361
 
| PH190223-132361
Line 203: Line 235:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.785
 
|-
 
|-
 
| PH190223-132345
 
| PH190223-132345
Line 208: Line 241:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.798
 
|-
 
|-
 
| PH190223-132329
 
| PH190223-132329
Line 213: Line 247:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.863
 
|-
 
|-
 
| PH190223-132296
 
| PH190223-132296
Line 218: Line 253:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.697
 
|-
 
|-
 
| PH190223-132280
 
| PH190223-132280
Line 223: Line 259:
 
| 3.29
 
| 3.29
 
| 3.34
 
| 3.34
 +
| 10.765
 
|-
 
|-
 
| PH190223-132409
 
| PH190223-132409
Line 228: Line 265:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.776
 
|-
 
|-
 
| PH190223-132425
 
| PH190223-132425
Line 233: Line 271:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.696
 
|-
 
|-
 
| PH190223-132440
 
| PH190223-132440
Line 238: Line 277:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.765
 
|-
 
|-
 
| PH190223-132360
 
| PH190223-132360
Line 243: Line 283:
 
| 3.29
 
| 3.29
 
| 3.32
 
| 3.32
 +
| 10.744
 
<!-- ================ START OF ROW 04 ================ -->
 
<!-- ================ START OF ROW 04 ================ -->
 
|-
 
|-
Line 249: Line 290:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.620
 
|-
 
|-
 
| PH190223-134648
 
| PH190223-134648
Line 254: Line 296:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.757
 
|-
 
|-
 
| PH190223-134519
 
| PH190223-134519
Line 259: Line 302:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.762
 
|-
 
|-
 
| PH120223-134644
 
| PH120223-134644
Line 264: Line 308:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.798
 
|-
 
|-
 
| PH190223-134515
 
| PH190223-134515
Line 269: Line 314:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.669
 
|-
 
|-
 
| PH190223-134691
 
| PH190223-134691
Line 274: Line 320:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.822
 
|-
 
|-
 
| PH190223-134713
 
| PH190223-134713
Line 279: Line 326:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.874
 
|-
 
|-
 
| PH190223-134628
 
| PH190223-134628
Line 284: Line 332:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 11.145
 
|-
 
|-
 
| PH190223-134632
 
| PH190223-134632
Line 289: Line 338:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 11.249
 
|-
 
|-
 
| PH190223-134760
 
| PH190223-134760
Line 294: Line 344:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.829
 
<!-- ================ START OF ROW 05 ================ -->
 
<!-- ================ START OF ROW 05 ================ -->
 
|-
 
|-
Line 300: Line 351:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.393
 
|-
 
|-
 
| PH190223-134712
 
| PH190223-134712
Line 305: Line 357:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.558
 
|-
 
|-
 
| PH190223-134631
 
| PH190223-134631
Line 310: Line 363:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.480
 
|-
 
|-
 
| PH190223-134708
 
| PH190223-134708
Line 315: Line 369:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.497
 
|-
 
|-
 
| PH190223-134595
 
| PH190223-134595
Line 320: Line 375:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.558
 
|-
 
|-
 
| PH190223-134755
 
| PH190223-134755
Line 325: Line 381:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.590
 
|-
 
|-
 
| PH190223-134536
 
| PH190223-134536
Line 330: Line 387:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.520
 
|-
 
|-
 
| PH190223-134692
 
| PH190223-134692
Line 335: Line 393:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.628
 
|-
 
|-
 
| PH190223-134696
 
| PH190223-134696
Line 340: Line 399:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.599
 
|-
 
|-
 
| PH190223-134599
 
| PH190223-134599
Line 345: Line 405:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.622
 
<!-- ================ START OF ROW 06 ================ -->
 
<!-- ================ START OF ROW 06 ================ -->
 
|-
 
|-
Line 351: Line 412:
 
| 3.29
 
| 3.29
 
| 3.38
 
| 3.38
 +
| 10.739
 
|-
 
|-
 
| PH190223-134675
 
| PH190223-134675
Line 356: Line 418:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.715
 
|-
 
|-
 
| PH190223-134697
 
| PH190223-134697
Line 361: Line 424:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.767
 
|-
 
|-
 
| PH190223-134584
 
| PH190223-134584
Line 366: Line 430:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.809
 
|-
 
|-
 
| PH190223-134744
 
| PH190223-134744
Line 371: Line 436:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.879
 
|-
 
|-
 
| PH190223-134596
 
| PH190223-134596
Line 376: Line 442:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.633
 
|-
 
|-
 
| PH190223-134740
 
| PH190223-134740
Line 381: Line 448:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.695
 
|-
 
|-
 
| PH190223-134643
 
| PH190223-134643
Line 386: Line 454:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 11.051
 
|-
 
|-
 
| PH190223-134681
 
| PH190223-134681
Line 391: Line 460:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.863
 
|-
 
|-
 
| PH190223-134568
 
| PH190223-134568
Line 396: Line 466:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.842
 
<!-- ================ START OF ROW 07 ================ -->
 
<!-- ================ START OF ROW 07 ================ -->
 
|-
 
|-
Line 402: Line 473:
 
| 3.29
 
| 3.29
 
| 3.38
 
| 3.38
 +
| 10.666
 
|-
 
|-
 
| PH190223-134739
 
| PH190223-134739
Line 407: Line 479:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.820
 
|-
 
|-
 
| PH190223-134761
 
| PH190223-134761
Line 412: Line 485:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.769
 
|-
 
|-
 
| PH190223-134680
 
| PH190223-134680
Line 417: Line 491:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.719
 
|-
 
|-
 
| PH190223-134551
 
| PH190223-134551
Line 422: Line 497:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.741
 
|-
 
|-
 
| PH190223-134676
 
| PH190223-134676
Line 427: Line 503:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.765
 
|-
 
|-
 
| PH190223-134563
 
| PH190223-134563
 
| 076
 
| 076
−
| 0.65 😢
+
| 0.65
 
| 3.33
 
| 3.33
 +
| 10.773
 
|-
 
|-
 
| PH190223-134723
 
| PH190223-134723
Line 437: Line 515:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.813
 
|-
 
|-
 
| PH190223-134745
 
| PH190223-134745
Line 442: Line 521:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.811
 
|-
 
|-
 
| PH190223-134664
 
| PH190223-134664
Line 447: Line 527:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
−
<!-- ================ START OF ROW 07 ================ -->
+
| 10.754
 +
<!-- ================ START OF ROW 08 ================ -->
 
|-
 
|-
 
| PH190223-134728
 
| PH190223-134728
Line 453: Line 534:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 11.277
 
|-
 
|-
 
| PH190223-134564
 
| PH190223-134564
Line 458: Line 540:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 11.429
 
|-
 
|-
 
| PH190223-134724
 
| PH190223-134724
Line 463: Line 546:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.742
 
|-
 
|-
 
| PH190223-134627
 
| PH190223-134627
Line 468: Line 552:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.689
 
|-
 
|-
 
| PH190223-132318
 
| PH190223-132318
Line 473: Line 558:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.815
 
|-
 
|-
 
| PH190223-132446
 
| PH190223-132446
Line 478: Line 564:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.787
 
|-
 
|-
 
| PH190223-132365
 
| PH190223-132365
Line 483: Line 570:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.836
 
|-
 
|-
 
| PH190223-134709
 
| PH190223-134709
Line 488: Line 576:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.706
 
|-
 
|-
 
| PH190223-134693
 
| PH190223-134693
Line 493: Line 582:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.729
 
|-
 
|-
 
| PH190223-132399
 
| PH190223-132399
Line 498: Line 588:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.863
 
<!-- ================ START OF ROW 09 ================ -->
 
<!-- ================ START OF ROW 09 ================ -->
 
|-
 
|-
Line 504: Line 595:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.736
 
|-
 
|-
 
| PH190223-134660
 
| PH190223-134660
Line 509: Line 601:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.719
 
|-
 
|-
 
| PH190223-134531
 
| PH190223-134531
Line 514: Line 607:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.742
 
|-
 
|-
 
| PH190223-134707
 
| PH190223-134707
Line 519: Line 613:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.785
 
|-
 
|-
 
| PH190223-132382
 
| PH190223-132382
Line 524: Line 619:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.732
 
|-
 
|-
 
| PH190223-132301
 
| PH190223-132301
Line 529: Line 625:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.804
 
|-
 
|-
 
| PH190223-132445
 
| PH190223-132445
Line 534: Line 631:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.636
 
|-
 
|-
 
| PH190223-134516
 
| PH190223-134516
Line 539: Line 637:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.610
 
|-
 
|-
 
| PH190223134757
 
| PH190223134757
Line 544: Line 643:
 
| 3.29
 
| 3.29
 
| 3.32
 
| 3.32
 +
| 10.635
 
|-
 
|-
 
| PH190223-132223
 
| PH190223-132223
Line 549: Line 649:
 
| 3.29
 
| 3.29
 
| 3.40
 
| 3.40
 +
| 10.686
 
<!-- ================ START OF ROW 10 ================ -->
 
<!-- ================ START OF ROW 10 ================ -->
 
|-
 
|-
Line 555: Line 656:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.723
 
|-
 
|-
 
| PH190223-132376
 
| PH190223-132376
Line 560: Line 662:
 
| 3.29
 
| 3.29
 
| 3.32
 
| 3.32
 +
| 10.736
 
|-
 
|-
 
| PH190223-132349
 
| PH190223-132349
 
| 102
 
| 102
−
| 3.24 🙁
+
| 3.24
 
| 3.32
 
| 3.32
 +
| 10.813
 
|-
 
|-
 
| PH190223-132430
 
| PH190223-132430
Line 570: Line 674:
 
| 3.29
 
| 3.29
 
| 3.36
 
| 3.36
 +
| 10.786
 
|-
 
|-
 
| PH190223-132297
 
| PH190223-132297
Line 575: Line 680:
 
| 3.29
 
| 3.29
 
| 3.32
 
| 3.32
 +
| 10.668
 
|-
 
|-
 
| PH190223-132302
 
| PH190223-132302
Line 580: Line 686:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.730
 
|-
 
|-
 
| PH190223-134521
 
| PH190223-134521
Line 585: Line 692:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.600
 
|-
 
|-
 
| PH190223-134762
 
| PH190223-134762
Line 590: Line 698:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.628
 
|-
 
|-
 
| PH190223-132410
 
| PH190223-132410
Line 595: Line 704:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.682
 
|-
 
|-
 
| PH190223-132383
 
| PH190223-132383
Line 600: Line 710:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.619
 
<!-- ================ START OF ROW 11 ================ -->
 
<!-- ================ START OF ROW 11 ================ -->
 
|-
 
|-
 
| PH190223-132312
 
| PH190223-132312
 
| 110
 
| 110
−
| 3.28 😟
+
| 3.28
 
| 3.33
 
| 3.33
 +
| 10.486
 
|-
 
|-
 
| PH190223-132456
 
| PH190223-132456
Line 611: Line 723:
 
| 3.29
 
| 3.29
 
| 3.34
 
| 3.34
 +
| 10.401
 
|-
 
|-
 
| PH190223-132429
 
| PH190223-132429
Line 616: Line 729:
 
| 3.29
 
| 3.29
 
| 3.34
 
| 3.34
 +
| 10.522
 
|-
 
|-
 
| PH190223-132285
 
| PH190223-132285
 
| 113
 
| 113
−
| 3.24 🙁
+
| 3.24
 
| 3.32
 
| 3.32
 +
| 11.400
 
|-
 
|-
 
| PH190223-132377
 
| PH190223-132377
Line 626: Line 741:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 14.682
 
|-
 
|-
 
| PH190223-132366
 
| PH190223-132366
Line 631: Line 747:
 
| 3.29
 
| 3.29
 
| 3.32
 
| 3.32
 +
| 10.532
 
|-
 
|-
 
| PH190223-134633
 
| PH190223-134633
Line 636: Line 753:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.617
 
|-
 
|-
 
| PH190223-134585
 
| PH190223-134585
Line 641: Line 759:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
 +
| 10.706
 
|-
 
|-
 
| PH190223-132218
 
| PH190223-132218
Line 646: Line 765:
 
| 3.29
 
| 3.29
 
| 3.33
 
| 3.33
−
| Slightly torn wrapper 😟
+
| 10.610
 +
| Slightly torn wrapper
 
|-
 
|-
 
| PH190223-132447
 
| PH190223-132447
Line 652: Line 772:
 
| 3.29
 
| 3.29
 
| 3.32
 
| 3.32
 +
| 8.131
  
 
|}
 
|}
Line 663: Line 784:
 
==== First Charge ====
 
==== First Charge ====
  
−
A custom 5-cell holder was made from wood and brass strips (26650 cell holders are wiedly expensive , given how cheap 18650 cell holders are) and plugged in to a [https://www.toolkitrc.com/m7 ToolkitRC M7], which was plugged in to the benchtop power supply. This setup was used to charge 5 cells at a time (24 times) to charge the cells to 3.60V, the maximum setting the M7 can charge LiFePO₄ cells to. Then, the cells were charged 2 at a time on a [https://www.nitecorestore.com/Nitecore-D2-DigiCharger-p/chg-nite-d2.htm NiteCore Digicharger D2] to 3.65V.
+
A custom 5-cell holder was made from wood and brass strips (26650 cell holders are wiedly expensive , given how cheap 18650 cell holders are) and plugged in to a [https://www.toolkitrc.com/m7 ToolkitRC M7], which was plugged in to the benchtop power supply. This setup was used to charge 5 cells at a time (24 times) to charge the cells to 3.65V, the maximum setting the M7 can charge LiFePO₄ cells to. Then, the cells were charged 2 at a time on a [https://www.nitecorestore.com/Nitecore-D2-DigiCharger-p/chg-nite-d2.htm NiteCore Digicharger D2] to 3.70V.
  
 
==== Self-Discharge ====
 
==== Self-Discharge ====

Latest revision as of 20:19, 21 September 2023

A project by Jpt4 and AVH to homebuild batteries for their personal ebikes.


Contents

[edit] Cells

120 (total) LiFePO₄ 26650 cells purchased from Battery Hookup for the $228. Their specifications are as follows:

  • Make/Model: K2 LFP26650E
  • Size: 26650
  • Voltage: 3.2
  • Capacity: 3.8 amp-hours (12.16 watt-hours)
  • Maximum Voltage: 3.65 (safe) 4.1 (maximum)
  • Minimum Voltage: 2.5 (safe) 2.0 (minimum)
  • Continuous Discharge Current: 12 amps
  • Maximum Discharge Current: 28 amps for 30 seconds
  • Recommended Charging Current: 3.8 amps

[edit] Packaging

The cells arrived in a tightly-fitting two-piece vacuum-formed plastic package that holds all the cells vertically in a 10x12 grid. The top of half of the package had some splits and cracks near one corner. The package, along with a desiccant pack, was in a thin plastic bag, zip-tied shut, in an exactly-fitting cardboard box.

[edit] Labels and Markings

Each cell is marked from the factory: 

  Li-Ion IFpR27/65
+ K2 Energy LP26650E-3800-21 -
  3.2V 3.8AH(12.16Wh)

Also, each cell has a serial number in a QR code near the negative terminal, (usually, but not always) on the side opposite the label. The dot-matrix printer that made the codes wasn't perfectly aligned, so many cells have codes that are slightly distorted and difficult to scan. Using the Barcode Scanner app, the codes could be scanned more reliably sideways, or at not-quite-90-degree angles.

To make it easier for us to keep track of the cells, the first time each cell was removed from the packaging, it was given a three-digit number corresponding to the row and column they were from in the box. 000 is from the top-left, 009 is from the top-right, 110 is from the bottom-left, and 119 is from the bottom-right. The labels are written in permanent marker on the ample blank, white space on the cell wrappers, and underlined so that there is no ambiguity which way the number is supposed to be read.

[edit] Individual Cell Measurements

K2 26650 Li-Ion Cells
Serial Number Label Out-Of-The-Box Voltage Self-Discharge Voltage Capacity (watt-hours) Remarks
PH190223-132431 000 3.29 3.33 10.682
PH190223-132415 001 3.29 3.33 10.770
PH190223-132362 002 3.29 3.33 10.808
PH190223-132351 003 3.29 3.33 10.898
PH190223-132270 004 3.29 3.33 10.932
PH190223-132286 005 3.29 3.33 10.876
PH190223-132393 006 3.29 3.33 10.802
PH190223-132397 007 3.29 3.33 10.945
PH190223-132328 008 3.29 3.33 10.943
PH190223-132317 009 3.29 3.33 10.862
PH190223-132458 010 3.29 3.33 10.824
PH190223-132442 011 3.29 3.33 10.835
PH190223-132426 012 3.29 3.33 10.908
PH190223-132378 013 3.29 3.33 10.915
PH190223-132265 014 3.29 3.33 10.880
PH190223-132281 015 3.29 3.33 10.873
PH190223-132457 016 3.29 3.33 10.876
PH190223-132424 017 3.29 3.33 10.640
PH190223-132392 018 3.29 3.33 10.710
PH190223-132344 019 3.29 3.33 10.737
PH190223-132367 020 0.00 3.21 8.886
PH190223-132350 021 3.29 3.34 10.678
PH190223-132334 022 3.29 3.34 10.845
PH190223-132233 023 3.29 3.34 10.792
PH190223-132269 024 3.29 3.34 10.758
PH190223-132462 025 3.29 3.33 10.813
PH190223-132398 026 3.19 3.32 9.369
PH190223-132414 027 3.29 3.33 10.759
PH190223-132413 028 3.29 3.33 10.788
PH190223-132333 029 3.29 3.33 10.646
PH190223-132394 030 3.29 3.33 10.740
PH190223-132361 031 3.29 3.33 10.785
PH190223-132345 032 3.29 3.33 10.798
PH190223-132329 033 3.29 3.33 10.863
PH190223-132296 034 3.29 3.33 10.697
PH190223-132280 035 3.29 3.34 10.765
PH190223-132409 036 3.29 3.33 10.776
PH190223-132425 037 3.29 3.33 10.696
PH190223-132440 038 3.29 3.33 10.765
PH190223-132360 039 3.29 3.32 10.744
PH190223-134729 040 3.29 3.33 10.620
PH190223-134648 041 3.29 3.33 10.757
PH190223-134519 042 3.29 3.33 10.762
PH120223-134644 043 3.29 3.33 10.798
PH190223-134515 044 3.29 3.33 10.669
PH190223-134691 045 3.29 3.33 10.822
PH190223-134713 046 3.29 3.33 10.874
PH190223-134628 047 3.29 3.33 11.145
PH190223-134632 048 3.29 3.33 11.249
PH190223-134760 049 3.29 3.33 10.829
PH190223-134552 050 3.29 3.33 10.393
PH190223-134712 051 3.29 3.33 10.558
PH190223-134631 052 3.29 3.33 10.480
PH190223-134708 053 3.29 3.33 10.497
PH190223-134595 054 3.29 3.33 10.558
PH190223-134755 055 3.29 3.33 10.590
PH190223-134536 056 3.29 3.33 10.520
PH190223-134692 057 3.29 3.33 10.628
PH190223-134696 058 3.29 3.33 10.599
PH190223-134599 059 3.29 3.33 10.622
PH190223-134756 060 3.29 3.38 10.739
PH190223-134675 061 3.29 3.33 10.715
PH190223-134697 062 3.29 3.33 10.767
PH190223-134584 063 3.29 3.33 10.809
PH190223-134744 064 3.29 3.33 10.879
PH190223-134596 065 3.29 3.33 10.633
PH190223-134740 066 3.29 3.33 10.695
PH190223-134643 067 3.29 3.33 11.051
PH190223-134681 068 3.29 3.33 10.863
PH190223-134568 069 3.29 3.33 10.842
PH190223-134579 070 3.29 3.38 10.666
PH190223-134739 071 3.29 3.33 10.820
PH190223-134761 072 3.29 3.33 10.769
PH190223-134680 073 3.29 3.33 10.719
PH190223-134551 074 3.29 3.33 10.741
PH190223-134676 075 3.29 3.33 10.765
PH190223-134563 076 0.65 3.33 10.773
PH190223-134723 077 3.29 3.33 10.813
PH190223-134745 078 3.29 3.33 10.811
PH190223-134664 079 3.29 3.33 10.754
PH190223-134728 080 3.29 3.33 11.277
PH190223-134564 081 3.29 3.33 11.429
PH190223-134724 082 3.29 3.33 10.742
PH190223-134627 083 3.29 3.33 10.689
PH190223-132318 084 3.29 3.33 10.815
PH190223-132446 085 3.29 3.33 10.787
PH190223-132365 086 3.29 3.33 10.836
PH190223-134709 087 3.29 3.33 10.706
PH190223-134693 088 3.29 3.33 10.729
PH190223-132399 089 3.29 3.33 10.863
PH190223-134535 090 3.29 3.33 10.736
PH190223-134660 091 3.29 3.33 10.719
PH190223-134531 092 3.29 3.33 10.742
PH190223-134707 093 3.29 3.33 10.785
PH190223-132382 094 3.29 3.33 10.732
PH190223-132301 095 3.29 3.33 10.804
PH190223-132445 096 3.29 3.33 10.636
PH190223-134516 097 3.29 3.33 10.610
PH190223134757 098 3.29 3.32 10.635
PH190223-132223 099 3.29 3.40 10.686
PH190223-132441 100 3.29 3.33 10.723
PH190223-132376 101 3.29 3.32 10.736
PH190223-132349 102 3.24 3.32 10.813
PH190223-132430 103 3.29 3.36 10.786
PH190223-132297 104 3.29 3.32 10.668
PH190223-132302 105 3.29 3.33 10.730
PH190223-134521 106 3.29 3.33 10.600
PH190223-134762 107 3.29 3.33 10.628
PH190223-132410 108 3.29 3.33 10.682
PH190223-132383 109 3.29 3.33 10.619
PH190223-132312 110 3.28 3.33 10.486
PH190223-132456 111 3.29 3.34 10.401
PH190223-132429 112 3.29 3.34 10.522
PH190223-132285 113 3.24 3.32 11.400
PH190223-132377 114 3.29 3.33 14.682
PH190223-132366 115 3.29 3.32 10.532
PH190223-134633 116 3.29 3.33 10.617
PH190223-134585 117 3.29 3.33 10.706
PH190223-132218 118 3.29 3.33 10.610 Slightly torn wrapper
PH190223-132447 119 3.29 3.32 8.131

[edit] Cell Testing

[edit] Out-Of-Box Voltage

When the package arrived, each cell's voltage was measured with the bench multimeter. (Also, its QR code was scanned, and its label written on.)

[edit] First Charge

A custom 5-cell holder was made from wood and brass strips (26650 cell holders are wiedly expensive , given how cheap 18650 cell holders are) and plugged in to a ToolkitRC M7, which was plugged in to the benchtop power supply. This setup was used to charge 5 cells at a time (24 times) to charge the cells to 3.65V, the maximum setting the M7 can charge LiFePO₄ cells to. Then, the cells were charged 2 at a time on a NiteCore Digicharger D2 to 3.70V.

[edit] Self-Discharge

This unintentional test was the result of effectively shelving the project for 16 months after the cells were charged. Cells with greater self-discharge (bad) will show lower voltages; cells with voltages closer to 3.65V have low self-discharge. Voltages were measures the same way out-of-box voltage was measured.

The results of this test were very encouraging. The cells held a much more consistent voltage than they had had out of the box, even the ones that had arrived severely discharged. This bodes well for their long-term performance in a battery.

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