9V DC output suitable for Guitar Multi-Effects Pedal Processor and more. Please note our battery DC port is inner Positive(+), outer Negative(-). But most guitar pedal input port is inner Negative(-), outer Positive(+). If you want to use this battery to power the guitar pedal, you must need a reversed polarity cable to connect the pedal with our battery, or will damage the guitar pedal. Our package not include this reversed polarity cable. Must be confirm the polarity before you connect it.
Please be sure to turn on the switch of the battery (at position "-") for charging. If not, it will not charge. If you have any questions, please contact us to get support, we will do our best to help you.