IN order to maintain the health of your handphone's battery, you have to completely drain it before recharging. Verdict:FALSEThis myth actually was true at one point but since the adoption of Lithium Ion (Li-ion) batteries, it's largely false. When charging a partially discharged NiMH or NiCAD battery, you are actually overcharging it which increases the growth of crystals within the battery. These crystals have jagged edges and sharp corners which can harm the insides of the battery and decrease its capacity. Crystal build-up is also the culprit here, it's just that how they build up in a Li-ion battery is different from NiCAD and NiMH.