Recently, my Roomba (iRobot) wasn't charging as it was kept for 2 years as it is.
I pulled out the battery pack and found that it's voltage was only 0.37v which means all the cells were deep discharged and probably dead. I put apart the battery pack and found 12 cells each 1.2v 3000mah capacity C type NiMH batteries. Then I measured voltages of all of all of them. Some measured 0.01V, some 0.04V and some 0.03V, which means all of them were dead. I tried charging them separately from my Nitecore Smart Charger but it showed an error.
I was going to dispose them off, but on doing some research I found out NiMH cells have good life and they don't die that easily. They can get deep discharged and can be revived easily unlike lithium cells. This means the cells aren't really dead? In most cases, yes.
So I found this great trick to revive dead NiMh batteries. To my surprise, it worked! You just need 1 cell that isn't dead (fully or partially charged) above 1.2V. Luckily I was somehow able to charge one cell from my charger directly. I don't know how that happended.
In this video, I am going to show you a simple trick which can revive your dead batteries in less than a minute. From 0.01v the voltage rised to 1.25v and then I could charge them normally with any compatible charger. Might not work in all cases. Make sure to charge the batteries within half and hour as they are not going to hold the increased voltage for long.
CAUTION: This trick only works for NiMH batteries which are 'rechargeable'. Don't try this with lithium/alkaline or any other type of batteries!
Even for NiMH batteries this MAY NOT work.
Perform this experiment at your own risk.
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