Streamlight 18650 Charger Kit -Capable of charging a single 18650 battery or two simultaneously. Dual input: accepts either 5V micro-USB or Streamlight &ldquo,traditional&rdquo, 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 statusCharger: 4.5in / 2.4ozBattery: 2.75in / 1.7oz