Bought a "cheap" battery off ebay - laudation 36V 10ah Li-ion Battery 18650 (10s3p) for $135 shipped
https://www.ebay.com/itm/laudation-3...72.m2749.l2649


It is supposed to have Built-in Panasonic NCR18650BD batteries.
Although the batteries are the right "color" they are unmarked, so I'm doubtful that is what they are. Certainly doesn't have the tel-tail black stripes at the ends of the cells.

I'm using this on a tiny controller (max 12 amps, probably 10 continuous), but the battery got hot after running hard - which doesn't sound right. Its rated 15amp continuous

. It did give me about 1hr 15min run time which is is what I expect.

The wiring is flimsy - not what I am used to at all. I did swap out the connectors to something more reliable. Cells are wrapped in cardboard - not really expecting more at this price point

Oddly, they sent me a charger even though it was not supposed to be included.