Hi, I need help choosing a battery.

So I am looking at 2 batteries that are almost Identical on Aliexpress. They're both 52v 35ah Triangle batteries made from Samsung 35e cells. However one has a bms rated for 40 amps continuous and the other is rated for 50 amps continuous. My Controller is rated for 45 amps.

Seems like a simple choice but it isn't. The 40 amp one is a smart bms with bluetooth and the seller is truthworthy. The other batteries seller has a high rating but not nearly as many ratings. Also their name is gibberish, which is never a good sign. Lastly, my 45 amp controller is programmable. I could limit amps to 40 to match the bluetooth bms.

BUT, I've read in multiple places you want a BMS that exceeds your controller rating with room to spare. Downtuning my controller to match a bms doesn't sound ideal. Also, my current battery is 2 30 amp packs in parallel, giving me a 60a limit that I've grown accustomed too.

So which one would you guys go for?

I would only focus on the quality of the cells and the maker's build quality

ignoring the BMS as most likely rubish not worth keeping anyway.

Really I would not buy from a random seller anyway, only from a source well recommended by someone I trust.

Saving 50% and getting something only 20% as good is not saving money.

Ok that makes sense. I was thinking about buying from the better seller and replacing the BMS with a better one anyway. I definitely want a smart bluetooth bms (if only because Im a nerd) but I want at least 60 amps continuous to be safe. As long as the pack comes with Samsung 35e cells it should be good.

caseylain said:

As long as the pack comes with Samsung 35e cells it should be good.

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Let them know if they turn out not to be genuine you'll be taking action.

And ideally be ready to cycle/load test immediately on receipt.

Will do, thanks!