The Tactacam REVEAL Lithium Cartridge is a long-life rechargeable battery for Reveal Cameras. Built-in battery meter keeps you updated on the battery life of you lithium pack REPLACES UP TO 1,000 AA BATTERIES Keeping your camera charged and cash in your pocket. BENEFITS No more time wasted loading AA batteries Eliminates excessive battery waste Saves money on non-rechargeable batteries over the life of your Reveal Cameras Charge Status There is a small red indicator light on the battery cartridge. When the battery is connected to the power cable: Charging = solid / constant / not blinking Fully Charged = no light / LED is off Error = blinking / LED is flashing (Error typically occurs if the charger is not the correct voltage, 5V)