Disclosed are methods, systems, and devices for charging a battery pack based on a temperature of the battery pack. The temperature of the battery pack is determined and compared with a reference temperature value. In response to determining that the temperature of the battery pack is less than the reference temperature value, heating-optimized pulses, having a first frequency, are applied to the battery pack. The heating-optimized pulses comprise a sequence of alternating positive and negative pulses, and carry a net positive charge. Concurrent to applying the heating-optimized pulses to the battery pack, the temperature of the battery pack is determined. In response to determining that the temperature of the battery pack is more than the reference temperature value, charging current is applied to the battery pack.