Are motherboards available for the 3G? I have a 16 Gig "G" but it will not turn on and I have been told it needs a...

FitBit says that the battery is a nicad rechargeable that must be discharged to 20% of its' capacity before charging and but be used every day to obtain the 30 month expected life. They only replace a unit that is less than 12 mos. old. As yet, there is no way to change the battery even here on iFixIt.