2-Pack Sigma SD14 Battery with Universal Charger- Replacement Sigma BP-21 Digital Camera Battery and Charger Replacement Sigma SD14 Battery and Charger Universal Charger features adjustable slider to charge different lithium-ion batteries (3.6V/3.7V/7.2V/7.4V) & AA/AAA batteries. Charge your battery by plugging the charger into a USB port. Lifetime Warranty Sigma BP-21 Battery Specs - Capacity: 1600mAh, Voltage: 7.4V,, Upstart Battery Brand On Sale for a Limited Time!