A lithium-Ion battery that went inactive or dead may be revived. Li-ion batteries typically have a maximum voltage of about 4.2V and at moderation are around 3.7V.  Once the battery hits 3.4V, it goes inactive and practically dead at 3.0V. The Li-Ion battery may be revived by following some simple procedures (it may or may not be successful, so you may just have to purchase a new battery).