nukezero
10 kW
Assuming you have a 8T MAC motor and BBS 48v, and you want to build a new battery pack, what cells would you use? Assume that you require 30A constant. Right now, both my battery packs are a meager 10Ah and after 2.5 years, they lost capacity. I'm down to 6-7Ah at best. Having learnt my lesson, I think it's best to build with more Ah now so when it loses 30% after 2-3 years, it still has at least 10-12Ah.
I am currently using 18650-25R the blue ones.
Based on my 2 hour research and update, it seems that today, the most popular cells are:
Sanyo/Pano 18650 GA
Sanyo 20700B 4000mAh !! whopping capcity0
Samsung 21700-30T gray cells
LG MJ1 (not as good as sanyo)
Samsung 35E
But here's my problem. If I were to go with 20700/21700 sized cells, I found that they do not have cell-spacer/holders like they do with the 18650. Also, it would appear that 20700/21700 seem to have better voltage drop than 18650, and some companies claim they have longer cycle life/life span. If that is the case, is there any more reason to continue buying 18650 for ebikes? Considering how eBikes, we can easily use 20700/21700 in a triangle pouch bag.
I am currently using 18650-25R the blue ones.
Based on my 2 hour research and update, it seems that today, the most popular cells are:
Sanyo/Pano 18650 GA
Sanyo 20700B 4000mAh !! whopping capcity0
Samsung 21700-30T gray cells
LG MJ1 (not as good as sanyo)
Samsung 35E
But here's my problem. If I were to go with 20700/21700 sized cells, I found that they do not have cell-spacer/holders like they do with the 18650. Also, it would appear that 20700/21700 seem to have better voltage drop than 18650, and some companies claim they have longer cycle life/life span. If that is the case, is there any more reason to continue buying 18650 for ebikes? Considering how eBikes, we can easily use 20700/21700 in a triangle pouch bag.