about your current battery, yeah maybe that's what was happening. Hold off on buying a new battery because this new motor and controller might work fine with that battery. (nevermind, I just read your last post.)....yeah you can't go wrong with
http://ebikes.ca ...I'm sure they'll hook you up with some good stuff. They got me a really nice motor and rim and controller. Been using it for a year now with no problems.
My fingers are crossed! :-)
When looking at lithium, you want to keep in mind what it's C rating is and how many continous amps you'll be using. Your new controller is a 25 amp controller . So for example, if you bought a Thundersky battery which is rated at 2C and it's capacity is 20AH...then 20AH x 2C = 40 amps. So you can use any controller 40 amps or under and it won't hurt the battery. So you take the capacity x the C rating = .
I look at Thundersky, and you were absolutely right - For the money was an excellent buy. Having said that and being very new at this, I thought the safest route is to simplify!? It seems as you need to do a bit more work, that is you have to either watch the balancer manually (which is probably better any way), or make it work with BMS.
The prices were also great at HighTekBikes, but almost all their batteries out of stock!
So with your 25 amp controller, if you got a 10AH pack then you'd need one rated for about 2C or more. So a 15AH pack that's rated at 2C might be what is best for you as far as lifepo4 goes. Or just about any LIPO pack would work since those are all high C rate packs.