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The most cost effective ones are not exactly on the market.
You order the parts and the needed tools/devices from the land of the free mail order businesses, and then you follow some youtube tutorial for instructions how to build your battery. Saves you thousands.
It is a good way to have a fire hazard at home, if you don't know what you're doing.
Owning a home AND being stupid is a good way to become poor. So what.
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