I think that it can help youMobile phone batteries range from about 700 mA-hrs to 1200 mA-hrs. Smart phones have larger in 1000 - 1300 mA-hrs range.
Rs of battery starts out about 0.15 ohms and degrades as it is cycled. At 300-400 cycle the Rs may double.
Charging depends on manufacturer. Typically about 0.2 to 0.6 of mA-hrs rating current. Li-Ions need several safety failsafe measures for charging. The two most important are never charge a cell phone battery that is below 1.8 vdc and charger voltage must not exceed 4.25 vdc. A battery less then 3.0vdc needs a <0.1C trickle charge until voltage comes up to about 3.4 vdc.