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This new battery didn't perform much better, perhaps an extra 12 hours with the same ...
on 4 March 2017
I have a Samsung Galaxy GT-S5830 and the old battery was lasting about 12 hours with WiFi, data and G3, and 20 minutes talk time. This new battery didn't perform much better, perhaps an extra 12 hours with the same usage (WiFi etc.). However, this is always going to be the case when the phone is used as a mini computer - the demands are just too much for the small battery. Checking the battery function did lead me to realise that although I had WiFi etc on, most of the time I didn't need these functions because I use my other devices (iPad, MacBook, Kindle Fire) to do most of my data work, plus I don't want be alerted about incoming emails all the time. So, I switched off WiFi and data, and changed to 2G, and with 30 minutes talk the battery has been running for 36 hours and is at 50% charge - it will probably run for 3 days with an hour of talk on these reduced settings. I was thinking of buying a Nokia retro-brick, but having lobotomised my phone (it definitely is no longer smart) I already have a Samsung brick (and no charging for 3 days, so far).