Where to buy Li-Polymer Battery?
Li-Polymer Battery is widely adopted in Remote Controlled Toy industry. The life of Li-Polymer battery is longer than Ni-Mh and other old fashion battery.
However, you have understand that the Li-Polymer battery requries much more knowledge to charge.
First, you must have a digital balancing charger if you want to make your lipo live longer.
There are many Balancing Charger in the market, but such as www.swanghobby.com are selling
some Balancing Charger which can stop charging the lipo when it is full. Surely, the balancing charger can deliver power to each cell balancingly.
You may check: http://www.swanghobby.com/li-polymer-battery-and-charger-c-201.html
Also, when you start to buy a li-polymer battery , please make sure that you know the LOAD AMP by your machine such as motor.
Here is a simple forumla.
If the battery is 5000mah 30C, that's mean it can deliver 5A (5000mah / 1000) x 30 = 150A per hour.
If your motor load is 75A, that's mean it can run 2 hour continuously.
You can check more 30C , 20C li-polymer battery at here http://www.swanghobby.com/li-polymer-battery-and-charger-c-201.html