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Do you have any idea what your capacity is 9 years later?

I discharged one of the packs. No apparent change in the cells' physical appearance.

Thanks for the input. Yes, mine do have labels. Is manufacture date decipherable from them? I plan to experiment with them, mostly. I was thinking of a small basic solar installation at home just for kicks, but I remain undecided. Lately, I’ve been capacity testing the individual cells in one...

Steve, I appreciate the thoughtful and detailed reply. Thank you. I will give it a go and report back. Seasons greetings to you, too.

Thanks for the reply. They are at 100% SOC in the images above. I'll discharge them and pay closer attention to their physical condition. I've considered your suggestion of making one good battery, but I was reluctant to release the cell compression for fear of making the swollen cells worse...

I acquired two "new," old stock GBS LFP 200Ah 12v packs (GBS LFP200Ah-A cells) primarily to learn and experiment with. They'd been sitting in their boxes in a pole barn in Michigan for an unknown duration, but perhaps 3-5 years. Pack voltages were around 13.14v when I opened them. I added a...

Obvious enough now. Thanks for deciphering. And that explains a lot.