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I hope these guys http://edisonjunior.com/about.html know what they are doing with lithium batteries, and POP is made out of fire-resistant materials and includes proper battery management system.

These days you can get a single chip that nearly does all the "battery management" for you.

example: http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=e...

The example that you've given is is a single cell, linear charge management controller.

For a 26Ah (what voltage?) LiIon (LiPoly?) pack you need a lot more than that. Balancing, temperature monitoring, overcharge/over-discharge protection, current limit.

That isn't the only chip microchip makes for recharging, but it's probably the cheapest. There are more complicated (larger) chips that do everything from overcharge protection, temp monitoring, etc. Some applications don't need all that fancy stuff. The chip I linked is 4 years old, but they make new versions of the chip almost every year.

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