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I have direct access to a battery vendor here in Illinois for LiFePO4 packs of all shapes and sizes. All brand new items. I have bought my K2 Energy LiFePO4's from them. I can sell anyone these batteries if you would like too but it's not my primary business and I don't have much time for it...

I might add that there is foam inside the 100AH battery box and it's nice and snug. I also used Great Stuff foam to back fill the green K2 energy builds.

I personally use this one. The reason I use this and not a higher amperage one is some of the packs I use recommend a max charge amperage at 18 amps. Be aware of maximum charging rates...