Summary: My partner prefers no frills mobile phones. The original battery was no longer holding a charge and was being charged every day. There are many batteries of this type on the market but when you read the specifications it seems obvious that they are copies. This one, although more expensive, seems to match the original spec. perfectly. So far this battery is holding its charge for 2-3 days. What more can I say? It does what I expect it to do.
Summary: Old battery had been in use for 3 or 4 years. It was not holding its charge, and did not seem to last very long when I was making calls as well as using Bluetooth all the time. New battery is great. I am avoiding overcharging it. Charge seems to last longer during heavy use, and battery holds its charge when not in use.