This battery pack is a direct-fit replacement for the back/vibrato cover on a Strat®. The ideal power solution for Fishman Fluence pickups, these lithium-ion packs require no modification of your guitar. They can also be used to power other onboard 9-volt pickups and accessories, provided they do not exceed the pack’s 10 mA current limit. As a result, this battery pack is not suitable for devices with higher power demands, such as Sustainer pickups or similar systems. Featuring a current capacity similar to a premium 9-volt alkaline battery, this battery pack is rechargeable via a standard mini-USB cable, which is included in the box. LED indicators let you know when the battery pack is “full” and when it’s time to recharge. Complete recharge time from “empty” is 3 hours or less, and a full charge offers weeks, not hours, of playing time between charges (depending on load). Strat® is a registered trademark of FMIC.