Why does my phone only work when its charging
it starts up and then goes off repeatedly.
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If your phone only works when connected to the charger, most probably the battery is failing to hold its' charge and will need to be replaced. Even rechargeable batteries have a life span.
Here is the Ifixit guide on how to replace the battery.
Here is a link to just one supplier of the battery. If this supplier doesn't suit you there are others, just go online and search for Samsung Galaxy S5 Active battery.
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