Features and Benefits: Charge with existing Stinger chargers, USB cord or lithium ion bank charger; Long-lasting lithium ion battery pack with multiple charging options; Charges in 5 hours; Integrated safety circuit protects battery pack from overcharge/overdischarge; 2.75 in (7.0 cm); 1.7 oz (48 grams); A long-lasting SL-B26 USB rechargeable battery pack offers multiple charging options using existing Stinger smart chargers and bank chargers to charge inside the light; use a dual USB cord to charge the battery pack outside the light or a Li-ion battery bank charger to charge multiple batteries at once.