Lithium-ion batteries

>>1104608
The goto is hobbyking

Lower prices in the Asian storeally but slow shipping.

Faster shipping but hire price in the American warehouse

>>1104608
Use power tool batterys or a golf cart battery.

You can't just put lots of hobby batteries in a motorbike. With the amount you will need complex battery management and cooling will be needed.

>>1104788
fuck that shit. op, just hook them as you like and charge those bad boys at 5C

>>1104608
Just make sure the batteries have good BMSs. Obviously for safety, but also to make charging easier the system more reliable. I like LiFePO4 batteries, they're slightly more expensive and slightly bulkier but won't violently explode if you sneeze on them. Dakota Lithium aka Clean Republic make nice ones for ebikes.

>>1104608
bmsbattery.com
Well that's where I got mine for an electric bicycle.

Aliexpress is where I've got my last three 20ah 48v batteries. There's some reliable dealers on there.

Delivery is usually 3-4 weeks, but half the price of a UK supplier.

I discovered someone using these for motorbikes recently. Energy density is lower than the best 18650 cells but rated for 40A charge 100A continuous discharge. They are basically normal NMC li-ions but doped with graphene oxide flakes to reduce resistance allowing for large currents. The guy who bought some said they sell them for around $20 per 10ah cell or $29 for the 20ah.

For DIY the energy trade off is probably worth avoiding complex cooling systems needed for 18650 cells.

http://www.szwestart.com/ProductView.asp?ID=1083