In our testing of the EVO 4G (review), we found the battery life to be not so great. A surefire way to get better battery life from any device, the EVO 4G included, is to get a larger battery (like the one we recently reviewing for the HD2). Seido is showing off their 3500mAh battery on their website, which adds a considerable amount of size to the (already-large) device. The battery is listed as “coming soon” with no price showing.

(via: Good and EVO)