I purchased two manual XL batteries in January, used them constantly for a few months... then I got a Chuck, which died a month later... used the XL batteries as backup while it was being repaired... then the Chuck died again and I gave up on it... back to my V4L batteries, which were still going strong... then I bought two ego/Riva batteries, both of which died after only a month... and I'm now back to using my XL batteries, and they are still kicking! Great product, guys.. 