Fishman Rechargeable Battery Pack STWH

The battery itself does what it's supposed to do. The main problem with it is not very clever physical design. Forming the device as a backplate is a good idea but the inside part of the pack might be too bulky for the middle spring in the tremolo cavity, but also for some claws or even sustain blocks. The Tremsetter I had inside the guitar had to be removed so that the inside of the battery pack could fit. So, don't forget to measure everything before you order and to consult someone within the store, regarding battery pack size, or be prepared to modify your instrument.