Originally Posted by
dbf73
Bought first gen Di2 in 2011 w external battery and it has been flawless. At least 1000 miles between charges until this month when the battery only held a charge for a hundred or so and then totally died. Nice thing about living in same city as QBP is that LBS had a new battery the same afternoon
update - turns out battery not bad. New battery dead after a day. Operation on charged battery fine but quick drainage guess due to partial short somewhar. Since this is my trainer bike now, I’ll wait til outdoor season a regular thing and then investigate further. For now will remove battery when not riding