If you have a multimeter (or know someone working with electronics) you can check of it holds any charge at all.
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Ps 2.
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When dropped in salt water a lot of stuff can fail. But reading that it used to work before you opened it my guess is that you didn't connect it back properly.
EDIT: Reading again I realized that it has been waterdamaged. Then there is a lot of things than can have failed. It can be your battery. But it's not certain.
Ps.
If you have a multimeter (or know someone working with electronics) you can check of it holds any charge at all.
EDIT: Reading again I realized that it has been waterdamaged. Then there is a lot of things than can have failed. It can be your battery. But it's not certain.
Ps.
If you have a multimeter (or know someone working with electronics) you can check of it holds any charge at all.
Your battery is dead or not connected properly.
Try to open it up and reconnect the battery.
If that doesn't help your battery is dead.
Ps.
If you have a multimeter (or know someone working with electronics) you can check of it holds any charge at all.