This Keis 12V 2600mAH Li ion Battery Pack and UK Charger 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 5 Volt electronic devices with a USB connection. The charger pack, for 240 Volt British Mains, 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. An additional spare battery, i.e the Keis 12 Volt 2600mAH Battery Pack is also available.