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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 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...