Anyone who has ridden a lead acid powered ebike will tell you the range sucks and the bike is heavy as a brick. Lead batteries have given electric bikes and other electric vehicles a bad name. A Lithium battery pack transforms an electric bike from recreation to a means of transportation.
These pictures show a modern fully managed Lipo battery pack. Another option is an unmanaged pack built from Radio controlled aircraft batteries.
Some basic advantages and disadvantages of the two types of Lipo Packs:
Managed Battery packs
Advantages: The managed pack automatically shuts off when any cell becomes fully discharged, protecting the cells from damaging overdisscharge.
Managed packs balance while charging automatically. The user only needs to plug in a charger and wait for the green light to illuminate on the charger. Full charge usually takes only 1- 1.5 hours for a 48v 10 ah pack.
For more information use this website – Lithium Cells
R/C Packs- unmanaged packs
Advantages: The pack size can be tailor fit to the users’ needs. 4 individual R/C packs yeild about 15-20 miles range on flat ground. For a short ride of only 5- 8 miles the user could pack just two packs for a very light weight pack. Alternatively 10 – 20 packs could be stacked together to yeild close to 80 miles of range.
The cost of the unmanaged R/C packs is significantly lower than managed packs.
Individual R/C packs are available in a range of capacity, discharge rate and chemistry choices while fully managed packs generally come in 2 or 3 capacity choices and tend to offer lower discharge rates. Discharge rate is unimportant to users of lower powered ebikes but high powered machines need high discharge rate batteries. For very high amperage motor and controller configurations unmanaged R/C packs are the only feasible option