It’s amazing how many of these machines get given away for pennies when they are not working right, yet a good working unit will cost in the hundreds!
The Boss DR-770 is the predecessor to the Boss DR 880 and has all the great sounds, patterns and more when comparing to the DR-660. These are not as underrated as the Zoom drum and sampler machines, but are definitely not given the credit they deserve in todays music. So if you have the opportunity to pick one up for pennies due to a “Low Battery” error, well I suggest you pick it up.
The DIY Article for replacing the battery of the Boss DR770 can be found here.