My power bank is not working because it had been gone in water
How to fix it
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@shubhamsha69113 your power bank will either have capacitors or rechargeable Li-ion batteries (usually 18650) as well as a battery controller board. It is very possible that either the batteries (capacitors) or the controller have gotten shorted out. You would need to disassemble your power bank, then clean all the parts with 90%+ isopropyl alcohol. After a proper cleaning you will have to check the batteries (individually) as well as the controller. You will most likely have to rebuilt the power back.
Leaving water immersed devices to dry is not a good idea since you will end up with more corrosion damage. The water has to be properly cleaned out. Also, rice does not work. It maybe a good desiccant but does not remove water from electronic circuit boards i.e. your controller. Using rice is the equivalent of doing nothing and just waiting for parts to die because of corrosion.
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What is the make and model number of the power bank?
The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the power bank's operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away
First do not try to charge or to use your power bank and then disconnect and remove the battery as soon as possible to minimize any further damage.
Then you need to dis-assemble the rest of the power bank and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives which may leave conductive residues and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better
Here is a link that describes what happens. Electronics Water Damage
As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove the shields that may be covering some components as the water may have got in under there. The ends of any flex cables and their connectors need to be cleaned as well
Hopefully after you have done all it might possibly work correctly again.
If this process seems too daunting, take your power bank to a reputable, professional electronics repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.
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