I've had my iphone since September 2013, and trough bad charging methods (charging at 60%+ a lot, charging when not needed), and I've accumulated over 550 charge cycles. I have about 70% of the original 1430mAh battery. The battery doesn't last very long, and has started to fluctuate randomly. Is it a good idea to replace the battery? I've found a battery kit online for $10, so I'll be doing it myself. I'm comfortable inside electronics, upgraded a computer, built a computer, opened and repaired a Wii, dismantled a laptop and monitor.