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The attached picture shows two 120 AH LiFePO4 cells that have been overcharged. Stupidly, I bypassed my controller, and connected a trickle charger directly, and then promptly forgot about it. I found them several days later swollen as shown in the picture with well over 7 volts (2 cells) . I...

I am making up a 6.4 v battery. Doug

I misstyped, I meant: "I need a three stage charger without stages 1 and 3"

Matt, I got your two cells from UPS today. 2 days. Impressive! They arrived undamaged, fully charged with identical voltages. Good you packed them in foam. Looks like the box got thrown around a bit. Thanks Doug

I am working on an autonomous sailboat that will be 3 or 4 months at sea. I am powering it with two 120 AH LiFePo4 cells giving me 6.4 V. I will be drawing power at a maximum of 200 mA, and charging it with a max of 10A solar. My question is do I really need a BMS.. I can balance the cells...

As it turns out, the geometry of my cells has recently changed, and my "proper busbar" no longer fits. I thought that a 5" length of 14 AWG THHN would be fine for testing, since my highest current is 10 Amps. Doug

OK, there seems to be a consensus building here. I suppose I want to know what is going on inside these cells, before I discharge them and perform surgery on them. Robby, now that you mention it, most high-post responders are somewhat negative to my posts. John, I am relying on my...

Matt, I know what you are thinking: You are thinking that after your last sale, you will still have two cells left. Yes? Doug

When I said "well over 7 volts (2 cells)" that was the voltage of both cells. Each cell stayed well below 4 volts. Current would have been 0.5 A., or 2 Watts per cell. They never got hot. I messed with them today and they seem a bit softer than a month ago. I have been slowly discharging...

No, No, there is no evidence of liquid or gas leakage. If I didn't see them, I would think they were working as if they were new.

Much good information. Thanks! This 6 ft model boat is for this contest: https://www.microtransat.org/ It is a transatlantic "challenge" that has been going on annually since 2010, with only one successful completion. Reliability, reliability, simplicity, and weight are the four most...

Matt, You sold me 2 120 Ah batteries in 2021. I need another 2. Are these still for sale? Doug

I'll take two. I am in Virginia