vulcanears wrote: ↑May 11 2019 8:52amThank you so much for your insight, everyone
I ride 100km on long days, but I live right in the city center, so I can swap battery packs at home once or twice a day. So I thought the best option was to get 2 packs around 600Wh-700Wh each and cycle them between 4.1V and 3.3V.
I would like to go with Reention or Hailong battery packs, because I find the form factor very convenient. (If there are better options out there, I'm always grateful for brainstorm inspiration!) They come with 18650 cell holders, so using different battery sizes would mean a lot more work when building packs.
It is so true tha have one bigger battery instead of two small will give 4 times more lifetime to the battery pack, as other have mentionned. The battery will only live halve the stress than two big ones.
You maentionned reintion or hailong pack. You can probably pack 10S6P in those at most....
I would say, with the range you need, build yourselve a triangle frame pack and put 10S8P or 10S10P or 10S12P inside of it...
With that much in parallel, for only a 250W setup, Panasonic GA cells will be more than enough, but really, find the cheapest name brand cell you can find and it will be fine (by brand name, I mean the Big Four: Either Panasonic, Sony, Sanyo, LG-Chem or Samsung... oops that was five).
Build something like that, It will be super reliable and you will never worry about range :