(TECH) Battery specification

Dear seeedstudio,

what is the specification of battery, that i should use?

I bought this one: http://www.gme.cz/img/cache/doc/540/450/lithiovy-akumulator-nexcell-ics503040-600mah-3-7v-datasheet-1.pdf which has its protective circuit.

After few days i came to the module and battery was completly empty (with microUSB 5V plugegd in).

Can the protective circuit interface with battery charging within the GSM module? Do I need to start charging from code?

Thank you