Thank you dr_frost_dk for this really educating tread. Spent the last 3 days reading. This is very interesting and I didn't know until now that the physical limitations with todays battery technology is 1400 mA with a battery of this size. I have found here in Sweden a cheap replacement Bl-5j battery 9.98 Euro: http://www.hittabatteri.se/bl-5j According to them they use Chinese manufacture (SCUD) that work together with big companies such as Nokia and Motorola. They also claim to use lithium-cells of grade A type and that there batteries have double protective circuits. I am also curious of what charger/discharger you are using, (manufacture brand). I am thinking of maybe building a better charging station using the Japod BL-5J Replacement because it seems to me that the stock wall charger does a fair job combined with the built in BQ2415 charge chip but it could improve. Also I would like to know, I have learned back in the days you used NIMh batteries for cellphones you should always charge the battery for 24 h before use. This because the battery would "grow" and preform better, is this also true for the LiIon battery ? And how did it go with your fuse ? Did you find someone to replace it ? If not you could provide me with a picture of the fuses exact location on the circuit board maybe I can solder in a new. I use to chip Play station one and have done soldering of small surface mounted circuits before. I guess you live in Denmark and I work night there so maybe you live close.