Modern Li-ion batteries have an average life of 12 months before the start declining in performance but can decline if performance much faster if not treated correctly.
Before purchasing a replacement check that no other factors are causing the batteries decline such as:
Moving to a low signal area
Running background applications
Having 3G, Wi-Fi or Bluetooth enabled when not required
How to get the most out of your new battery
Try and give your battery a full charge / discharge as often as possible, run the battery all the way down and fully charge - this will help condition the battery
Avoid partial charges
Avoid constant trickle charges (such as USB charging)
Please be aware that all new batteries need an initial couple of full charge cycles (Full charge / discharge) before reaching maximum performance
HAZARDOUS GOODS: Li-ion batteries are classed as hazardous items and cant be shipped using many postal services such as Royal Mail. We ship all batteries using an express fully tracked specialist company.