| Table of Contents |
|---|
Lithium Phosphate (LiFePO4) Battery Pack
...
Original Battery Confguration - 12S8P
New Configuration - 4S8P x 3
Could use 3 BMSs for this configuration or just one.
...
Someone else's solution
Capacity Tests
First Discharge Test
...
Thoughts:
...
...
Single Battery Tests
...
Out of 2 batteries, it appears that we have 42-44% capacity left. 
The rated capacity of these batteries is 2500 mAh. It appears that the average capacity seems to be around: 1186 mAh.
| Chart | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
| Chart | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ||||||||||||||
|
| Code Block | ||||
|---|---|---|---|---|
| ||||
812 818 902 917 935 952 964 1017 1083 1087 1092 1095 1101 1109 1111 1119 1163 1187 1203 1213 1236 1255 1262 1277 1287 1332 1333 1431 1467 1478 1828 1891 |
...
Battery Pack Tests 4S8P
| Pack | Original Capacity | Starting Voltage | Final Voltage | Capacity (mAh) | % Capacity | ~Capacity/Cell | Notes |
|---|---|---|---|---|---|---|---|
| 2 | 20Ah | 14.4 (3.6v/cell) | 8v | 10156 | 51% | 1270 mAh | BMS Added |
| 2 | 14.0 ( 3.5v/cell) | 10.25 | 9935 | 50% | 1241 mAh | Charged with Car Charger. Cells: 3.46, 3.48, 3.53, 3.53 Not a lot of time between charge and discharge test. Discharged cells: 3.07, 3.01, 2.75, 2.73 | |
| 2 | 13.52 | 10.25 | 9683 | 48% | 1210 mAh | Charged with Car Charger. Cells: 3.36, 3.38, 3.38, 3.39 Discharged cells: 3.02, 2.95, 2.51, 2.43 | |
| 2 | Using new tester. 5A load Battery was charged a while ago and left to sit. | ||||||
| 3 | 20Ah | 14.4 (3.6v/cell) | 8v | 10926 | 55% | 1366 mAh | Could the battery be overcharged? |
| 3 | 8v | 9791 | 49% | 1224 mAh | |||
| 3 | 8.49v | 7727 | 39% | 965 mAh | BMS Added. | ||
| 3 | 8.55v | 6315 | 32% | 789 mAh | Charging via power may be the issue? Discovered that I had connected the cell voltage connectors in the wrong order. | ||
| 3 | 13.91 (3.48/cell) | 11.27? | 8123 | Cells balanced before test to: 3.52, 3.58, 3.31, 3.32 BMS is attached. Stopped at 11.27v because 1 cell voltage had dropped too low. Needs to be better balanced or taken apart and re-purposed. | |||
| 3 | All: 13.52 | 11.13 | 8052 | 40% | 1006 mAh | Before charge: Cells: 3.45, 3.47, 3.30, 3.30 | |
| 3 | 13.27v | 12.2?? Bounced back maybe? | 7270 mAh/ 90.58 Wh | Using new tester. 5A load Battery was charged a while ago and left to sit. | |||
| 4 | B-: 13.7 C-: 13.6 P-: 12.57 | 9.34 | 10924 | 55% | 1366 mAh | BMS Attached. Charged with C- using Car Lion Charger Cells: 3.46, 3.43, 3.41, 3.42 @9500mAh: 12.5V on all -Terminals Is there a voltage regulator on the output? @10945mAh - V=9.34 Disconnected - Cells: 2.80, 2.85, 2.87, 2.89 Restarted discharge and it said v=11.4v. | |
| 4 | 13.62 B-: 13.62 C-: 13.62 P-: 13.62 | 9.66 Read 10.6 after disconnect. | 11202 | 56% | 1400 mAh | Charged on C- using iMax B6 - Took 11845 mAh over 228min | |
| 4 | 10350mAh / 128.77Wh | Using new tester. 5A load Battery was charged a while ago and left to sit. | |||||
| 5 | 13.49 B-: 13.49 C-: 13.49 P-: 13.49 | 11.54 | 4537 | 23% | 567 mAh | BMS Attached. Charged with C- using Car Lion Charger Cells: 3.56, 3.32, 3.32, 3.32 After discharge: Cells: 2.28, 3.16, 3.17, 3.16 | |
| 5 | 4498 | Garbage | |||||
| 6 | All: 13.55 | 9.84 | 9435 | 47% | 1179 mAh | Charged on C- using Auto Charger | |
| 6 | 12.21 | Using new tester. 5A load Battery was charged a while ago and left to sit. | |||||
| 3,6 | 13.2 | Combined pack 3/6 Charged using battery charger to full Discharged at 10A using new tester | |||||
| 2,4 | 20.20 Ah / 249 Wh | Combined pack 2/4 Charged using batter charger to full Discharged at 10A using new tester First Stop - 20Ah @10A, Second Stop - @1A |
.
Notes:
Battery pack #1
- was disassembled into singles in order to to test single batteries.
...