21700 vs.18650 cells I'm looking at this 52v pack.

decksrx

1 mW
Joined
Aug 12, 2018
Messages
11
Location
Massachusetts
My current set-up is a 1500 watt DD kit from e bikeling. This is the link to the kit.
https://ebikeling.com/collections/ebikeling-ebike-conversion-kit/products/waterproof-48v-1500w-700c-direct-drive-rear-ebike-conversion-kit-1
For the last 2 years I was running a 48v 13ah battery with Samsung cells. After finding this site, I now know a little bit more about e bikes, batteries, etc. I now know it was just a matter of time before that battery was going to fail, and it did. I'm about 250lbs., mainly just take short trips (4-to5miles) mostly flat roads. I've booth knees replaced,so I just can't do that much pedalling. I'm looking into going to a 52v. battery, and this one was suggested to me by someone on this site.
https://www.eco-ebike.com/collections/batteries/products/52v-15ah-21700-cell-hailong-shark-battery
Does anyone have any thoughts or experience with or about this battery and company?
Any help is welcome and thanks in advance.
 
40a continuous discharge looks very dodgy to me.
Cell ratings Samsung INR21700-50E UNPROTECTED Li-ion battery. Not protected with a pcb. Don't charge above 4.2V ! Check the polarity before using or charging.! Keep distance from water. Storage : below 45 °C! Don't discharge below 3V!
Continuous Discharging Current : 10A
Max Discharging Current (pulse) for 1 sec : +/-15A

Other sites list them at 9.8a continuous.
So 30a discharge would be safe, I would be worried going over that.
 
48G from samsung would easily handle it. You would be on the edge using the 40a pack at 40a (the controller looks to be 40a).
 
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