I have a device with a 14.4V battery (a Roomba) and I wish to design a LiIon battery + charging system to replace the existing arrangement.
I would like to charge it with the standard charger that comes with the Roomba. The current battery box will take 8 - 18650 size cells.
My question is will a 4 cell, 14.4 V 4S Li-ion Lithium Battery 18650 Charger Protection Board 15A work to protect the batteries so I can use the standard charger that will provide 20 V to the charger protection board?
I was looking at using this: http://www.ebay.com/itm/321820489871?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Any ideas? Thanks!