The battery on my Pro Rider E-Tourer is getting a bit old and tired. So far I've returned a cheap E-Bay one as well as a much pricier one from a company that Pro-Rider advocated, as they no longer sell them themselves. Its a 36v 10ah silverfish type, that follows the line of the seat post, under the saddle. They all look the same on the promotional pics, but the differences in weight, fit, and overall quality have been shocking. If anyone has had a comparable problem and solved it, I'd love to hear about that.