Streamlight 18650 Charger Kit - Capable of charging a single 18650 battery or two simultaneously - Dual input: accepts either 5V micro-USB or Streamlight “traditional” AC or 12V DC power sources; Micro-USB input with custom locking feature charges from Streamlight AC/USB adapters or most other USB sources - Impact-resistant polymer construction - 18650 button-top lithium ion battery on-board safety control circuit; rechargeable up to 500 times - Charge time - Single bay: 3.5 hours (either bay) - Both bays: 3.5 hours left bay (priority) and 6.5 hours right bay - Individual bay LEDs for battery charge status - Charger: 4.5 in (11.4 cm); 2.4 oz (68 grams) - Battery: 2.75 in (7.0 cm); 1.7 oz (48 grams) - Use with Streamlight products that accept 18650 batteries, including the ProTac HL® USB and ProTac HL® 4