If the Z3 cannot hold a charge for very long, it may mean that the battery is becoming permanently depleted. If this is the case, the battery will need to be replaced. Follow the battery replacement guide for the Sony Xperia Z3 found here.
We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.
Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!