[quote author=donaldson link=topic=270.msg2278#msg2278 date=1274887121]Since I have my Eken open, I took the opportunity to measure the battery pack. It is 100mm x 62mm x 6mm. It's very definitely two cells wired together in series. Sorry, there is no visible catalog number or other identification.[/quote]Hi,What do you think about two like this? http://www.aliexpress.com/product-fm/312691596-CEL443493-1600mAh-7-4V-Li-polymer-rechargeable-battery-wholesalers.html 2 x (93x34x4,4mm) = 93x68x4,4mm Do you think 68 mm is possible?Sorry for my bad english