The stock battery is weak and hard to found a replacement. So I replaced it with nokia Bl6c1 which has a compatible dimension. You need to resolder the old battery circuit board to the new battery as the battery temp protection thermistor value is different.
My GPS/ GSM Tracker gave me wrong coordinate out of a sudden. Reset does not helo and end up open it up to takw a look. Found the GSM antenna contact has some corrosion, as it is used in somewhere with high humidity. Cleaning the contact and it works again.
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