Fishman Universal Battery Pack, rechargeable lithium-ion battery pack that can be fitted to amost any cover, pickguard, control plate or similar metal or plastic part, capacity similar to a premium 9-Volt alkaline battery, recharging via included mini-USB cable, USB cable battery life approx. 200 hrs., dimensions: 38.1mm x 44.3mm x 10.9mm, weight: 45g, color: black