: I have seen quite a few single cell li-poly mobile phone batterries for sale
: on ebay at very good prices. Is it feasable to strip off the plastic and
: solder them together to make a cheap Li-poly batttery pack?
Are they li-poly already? All phone batteries that I've seen are li-ion,
they are in metal cases (not in mylar pouches as li-poly), which makes them
heavier per capacity, and also their electrolyte is liquid (not solid),
which makes them far more dangerous in case of overcharge or short. I have
one li-ion pack for Pico Stik, but in the future will stick to lipolys.