Testing LiitoKala "7Ah" LiFePO4 Cells

In this episode, I test out a 4s2p arrangement of LiitoKala "7000 mAh" LiFePO4 cells. If you believe the label, this would end up with 14Ah capacity in a small package.

All in all, not what I expected. The pack works well, although it's slow to charge, but I was glad to try them out.

*Update* - I realize my calculations at the end of the video don't make much sense. I actually don't remember how long the endurance test ran, but the power analyzer measured 9.386 output until the inverter did a low-voltage cutoff. It was 2.3+ amps draw, perhaps for 4 hours.

*Update 2* - I did not take into account the power used during the high-load test in the beginning, so the total capacity for this test was 9.386 + however much used during the brief 22A draw CW test.

*Update 3* - When charging the battery after this video overnight, I used a different charger that goes to 14.6v and doesn't stop till the BMS cuts connection (instead of the Imax B6 "smart" charger that I used prior to this test). The total delivered into the battery from overnight charge was 12.039A. So it may really be a 14Ah battery or close to it.

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Parts List (Disclosure: I get a small commission on Amazon and eBay links, no change in price to you):
- LiitoKala "7000 mAh" LiFePO4 cells: https://www.aliexpress.com/item/2019-new-LiitoKala-Lii-70A-32700-3-2v-7000mAh-lifepo4-rechargeable-battery-cell-5C-discharge-battery/32966494333.html
- BMS: http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5575500276&toolid=10001&campid=5338528437&customid=&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F4S-BMS-Protection-PCB-Board-100A-3-2V-LiFePo4-18650-Battery-Balance-Packs-12-8V%2F283387223636%3FssPageName%3DSTRK%253AMEBIDX%253AIT%26_trksid%3Dp2057872.m2749.l2649
- Pure Nickel Strips 0.15mm thick 100mm long: https://amzn.to/2H210Ah
- Double cell battery holders for 32650 cells (will fit 32700): https://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_id=114&ipn=icep&toolid=20004&campid=5338528437&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F10pcs-32650-2x-Battery-Holder-Bracket-Cell-Safety-Anti-Vibration-Plastic-Spacer%2F162626276679%3FssPageName%3DSTRK%253AMEBIDX%253AIT%26_trksid%3Dp2057872.m2749.l2649
- Or print your own cell holders with a 3D printer: https://www.thingiverse.com/thing:2966931
- PVC Blue Shrink Wrap 170mm wide: https://amzn.to/2Xc6j9t
- LED mini voltmeters: https://amzn.to/2H3va5d
- Flat latching switches: https://amzn.to/2Y7Ss0v
- 5.5x2.1 power connectors (for charging): https://amzn.to/2ViPHMQ
- Anderson Powerpole connectors: https://amzn.to/2RfrNww
- ATO fuse holder 12AWG wire: https://amzn.to/2MQj6Kw

Or build a lower capacity but higher charge rate & higher discharge rate battery:
- https://youtu.be/AY1jIrknXCs
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Видео Testing LiitoKala "7Ah" LiFePO4 Cells канала AD6DM Dennis