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Panasonic ES-RT51 battery problems?
If your razor battery runs down after only a few shaves e.g jumps from 60% to zero Let the razor completely discharge by leaving it switched on until the blades stop moving completely. (This can take over 24 hours so be patient) When they are stop moving recharge the battery and you will find the battery will charge and discharge just like new!
(This may take a couple of discharge cycles). Only charge the battery when it is flat after this and the problem SHOULD not reoccur.
There is no way to revive a rechargeable battery once they go bad. Rechargeable batteries have a lifespan that is affected by how many times they have been discharged and recharged and how fully discharged they are between recharges. Most batteries will last longer if they are fully discharged before recharging and allowed to cool completely before recharging, heat being the main culprit to their longgevity. They will eventually reach a point where they will not charge anymore or if they do they will not hold a full charge for any appreciable time. The best test for the batteries ability to take a charge is to completely deplete the battery either through working it or sitting on the couch with the trigger pulled until it stops working completely, let it cool down then put it in the charger. If it charges, use it to see how long it lasts. If it dies quickly it needs to be replaced.
The manual says to charge for 16 hours if it has not been used in awhile. They say nothing about it over charging, but the batteries need to be used and let discharge through shaving. A fresh/new battery is supposed to last about 2 weeks before needing a recharge. I think keeping them charged all the time cuts down on battery life.
First try a REFRESH by discharging it COMPLETELY than re-charging it COMPLETELY (do that 4-6 times) nice week end project ha!, than if it still won't charge completely ASK FOR A REPLACEMENT OR REFUND... (if it's new it should be under waranty)
I hope you are observing the following:-
Recharging only when the batteries are almost
Continuously recharging or continuously using
as a corded razor will reduce life of batteries
Charge only when the indicator in charge meter starts blinking.
It appears that your batteries are gone. Hope you
have replaced the batteries with the new ones. Use a good brand
You didn't specify how old you model is.
Generally I would say, the battery is failed.
You might try taking it to whereever you bought it and politely ask for a replacement. Its also a good idea not to leave these in cars during sub freezing weather.
Your internal rechargeable Lithium battery must be getting old and therefore starting to loose its capacity to charge completely. Another symptom is significant reduction in Total play time and faster discharge on standby.