Originally Posted by
gauvins
... . 4x18650 Lithium batteries ....
If you buy some Li Ion batteries, there are a lot of counterfeit ones out there and there are lots of ones that claim great power which they do not have. I have bought several that were worthless.
I got lucky and got some from a seller on Amazon that appeared to have their rated capacity but I just checked and that seller no longer sells Li Ion batteries, so I have no suggestions on where to buy.