Magicshine 2000-Lumen LED Bike Light with Improved Battery and Charger Magic shine MJ-880 2000 Lumens Max Power 2 Hour Runtime at Max Power, Battery and Charger Included and battery would not work at its maximum capacity at low temperature, such as below 10 F; 2x CREE XM-L LED putting out a total of 2000 Lumens.T6 Aluminum with Hard Anodized Finish Complete with 8.4v 6.6ah battery. When the light is not used for over 1 month, it is recommended to fully charge and discharge the battery pack once a month.