Originally posted by 11111energy
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BMS, thats a given. There should never be a battery pack sold without its own BMS.
Capacity and voltage. My experience after my first 4 1/2 years 18,000K trouble free battery... Bigger capacity is always nice. Any kind of hills will use your battery alot quicker than riding on flatland. So consider your style of riding . I routinely go out for 50-60K. If Im going to the mountains I pedal on the flatland parts as much as I can to save my battery for the grunt up the hills. The higher the voltage you get the better for torque but the more battery you need so its a tradeoff. So in my case, I knew from experience that I wanted the biggest 48V downtube pack I could get which is 19 AH. Another way to do it is having a primary average size pack and add a secondary battery pack on a long day trip.
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