Cycleway town
Join Date: Jul 2014
Location: Milton Keynes, England
Posts: 1,402
Bikes: 2.6kw GT LTS e-tandem, 250w Voodoo, 250w solar recumbent trike, 3-speed shopper, Merlin ol/skl mtb, 80cc Ellswick
Mentioned: 7 Post(s)
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Quoted: 569 Post(s)
The supplied BMS tends to be a weak link, mine blew in both batteries before long and i spent 90 quid on a good quality pair.
The only reservation i have is that you're getting complete shutdown. If the battery wasn't giving enough, and your controller triggered safety cut-out for lack of power, the capacitors in the controller would keep the system and display alive, cutting only the motor. So i'm thinking the battery isn't your main suspect.
I have no idea how to test the controller, but as the display is only a reflection of it's state, the problem points to that. An external wiring fault would expose itself between components but your No1 factor here is the controller going full shutdown.