Place it inside a sealed plastic bag in addition to a sealed plastic container. This will prevent it from getting wet.
Do not use paper bags or foils as water can easily penetrate these materials.
Place the sealed battery inside the freezer and leave it overnight or at least 12 hours.
By exposing the battery to low temperatures such as the inside of a freezer it allows the battery cells to recharge a little enough to hold sufficient charge to be connected to a phone charger.
Remove the battery from the freezer. Allow it to warm up to room temperature.
Do NOT use the battery while it’s still cold.
Wipe any moisture off of the battery.
Insert it back into your phone but leave the device off. Plug the phone into the proper charger and allow the device to charge for 48-hours.
After the device has charged for 48-hours turn the device on and check the batteries power level. You may find that your once dead battery is revived and is now able to hold a charge again.
Jump-starting the Battery
First gather your supplies. You’ll need the following:
9-volt battery—Any brand will do.
Electric tape—You’ll need no more than five inches.
Electrical wire—Basic thin electrical wire will do. Red (+) and black (-) are preferred.
Connect the electrical wire to the positive and negative terminals of the cell phone battery first as these are smaller. You can identify the terminals of the battery by simply looking at the side of the battery. It will have a plus (+) and minus (–) sign to mark the terminals. Remember to use two separate wires or split wires for each of the terminals.
Do not connect the positive and negative terminals of either battery with itself.
Most cell phone batteries have more than two terminals use the ones that are furthest from each other or the ones on the outside. The center terminals are not to be used.
Cover the connections with electric tape. Take note which wires go to which terminals of the battery as not to connect a positive side to a negative.
Connect the wire coming from the positive terminal of the cell phone battery to the positive terminal of the 9-volt battery.
Do the same with the negative wire.
Do not connect opposite polarity positive to negative because this can short out your cell phone battery.
Secure the connection of the wires and the terminals of the batteries with electrical tape.
Place them in a cool dry place away from any water or heat.
Leave the connection for up to a minute or until your cell phone battery gets slightly warm. You should check the battery every 10-seconds or so for heat.
Remove the connections once the cell phone battery gets a little warm to touch.
Insert the cell phone battery back into your phone and check to see if your phone powers on.
Check the battery level once your phone is on. If the level is low plug the phone into a charger and wait until it is fully charged.
When cell phone batteries have reached their limit or are left discharged for a long period of time they eventually lose their ability to hold a charge. If your cell phone battery dies you don’t need to throw it out right away why not try reviving it first? Maybe all the battery needs is just a little push to make it functional again. Learn how by proceeding to Step 1.