Before last week i have very little knowledge of ebikes, batteries, electricity etc., but since then I have spent all my free time researching for the best/cheapest way to make a decent ebike.
I'm looking for something to use as my main form of transportation, hoping to only have to use my car when i need to go more than 15 miles away. My main stubmiling block (as it seems to be with everyone) is which battery to go with. I originally wanted a chain setup so i could have more leeway to play with things like gear ratios, but to simplify the design I decided to go with a BD-36 from Battery Space. Its one of the cheapest hubs i've seen and still 600w at 36v, plus what i've read seems good reviews. Are their better options options at a similar price (250-300)?
I've always been more of a DIYer and i've done a little bit of soldering, so for batteries I decided I wanted to build my own pack. I'm planning on 48v and 15-20ah. I was wondering if anyone had input on the following options:
D size Nickel Cadmium Rechargeable Battery 7000 mAh (R1ED-GD7000)
80 batteries - 40s2p
48v, 14ah, 28 amps at 2C, $.75 per/WH
TrustFire Protected TR 18650 2500mAh 3.7V Batteries
104 batteries - 13s8p
48v, 20ah, 40 amps at 2C, $.41 per/WH
Trustfire 18650 24000mAH w/built in PCB
91 batteries - 13s7p
48v, 16.8ah, 33.6 amps at 2C, $.51 per WH
Powerizer 10000mAH D Cells
40 batteries - 40s1p
48v, 10ah, 20 amps at 2C (rated to 30amps), $.55 per WH
Alright, bunch of newbie questions:
1. Better cells for what i'm looking to do?
2. Do these have enough amps? Would they be able to run the BD36 efficiently?
3. Are multiple parallel strings ok? I see one guy on these forums made a pack with 500 AA 2600mah (50s10p) batteries.
4. If i was going to use either B or C of these options should i build them as parallel strings and put them in series or in series then parallel? Or does it matter?
5. I wasnt able to find a data sheet for the Trustfires, anyone know how they would handle 2C?
6. Can you solder a battery with built in PCB without damaging it?
Thanks for your time!