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Thanks all. Very quick responses. For info I noticed the walk mode was working (intermittently) so I thought there must be some power there. I then pedalled it back up the slope and suddently the motor cut in (took much longer to cut in than the original battery but once going was OK). There...

So I have a Ridgeback Arcus with crank motor (Dapu MD250S). I detest this thing but wont bore you with the details. After a firmware update that fixed the bike dropping from 50% to 0% charge instantly the bike never does more then 19 miles on full charge. Doesnt matter what assistance level...