This Keis 12V 2600mAH Li ion Battery Pack is designed for all Keis Dual Power heated products including the Keis V501 Premium Heated Vest in Black and Red. The battery has a 2.6 AH capacity and can be used to charge or power up 5Volt electronic devices with its USB connection. This spare keis battery, can be charged using the Keis Li-ion Battery Charger UK, for 240 Volt British Mains, with the Keis Li-ion Battery Charger EU, for European 110 Volt EU mains or with the Keis 12V Li-Ion battery pack and UK Charger and is equipped with a LED charging status monitor. This Keis battery pack measures Height; 7 cms, Width 7cms and Depth of 2 cms. and weighs 200 grams. The initial charging time is ~ 4 hours, and then 2 to 3.5 hours from a totally discharged condition.