Recover deep discharged NiMH batteries with a simple uncontrolled charger

When your fancy controlled battery charger fails to detect deep discharged batteries, you have to go back to the basics.
Extremely simple Universal Ni-Cd Battery Charger teardown: • Extremely simple Unive...
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[@PurpKing4377]

Happy new year and welcome back

[@DrCassette]

Thank you! A happy New Year to you, too :)

[@fhwolthuis]

I had an almost dead motorcycle battery which didn't detect on the modern charger because it was so empty. Just held a 9v batterij against the poles for a second and presto, the charger started charging again 😂

[@gerryp9711]

Wellcome back.

[@mattinwinkymg]

Easiest way is to directly connect a fully charged battery to a dead one. Just watch temps. The idea is that the current burns the crystalline structures that cause the short in the battery and then restores it.

[@Greloteur]

It's quite bit the same for a car battery very low that won't be detected by an "intelligent" charger.
You Can take a second good battery, starting cables, en let for 10/20 minutes the good one charging this way the sick one. Then the intelligent thing will do his work 😁.
I will test this for accus. 👌

[@lbuuk8139]

Interesting video

[@philspencelayh5464]

I agree, I have an "intelligent" charger and every now and then it will say "bad" about one of my cells. I put it in my "basic" charger for half an hour or so and then the, perhaps not so "intelligent" charger will do its job.

[@Luke-san]

I sometimes do the same and actually wondered why they don't use like a 10K resistor to like a 5V, or was it 3V with this charger (I have the blue one from Conrad), line? I believe there will be some voltage across the plus and minus terminals and eventually the battery will be detected and charged. But you are absolutely right it's easier to see something happen and eventually put it in the charger. Like 20 years ago I would jumpstart them by connecting an fully empty cell to a charged one but since Li-ion there is no way that I will do that.

[@deebeenine]

I have the same problem with my Technoline BC 1000 charger that's very similar to your Voltcraft charger. I just connect the drained batteries to another 1,5 V cell for a few seconds to get rid of the "null" display. But unfortunately most of these batteries are lost once they were deep discharged and never regain their original capacity.

[@DrCassette]

After recovering the batteries seen in the video, I moved them over to the fancy charger which I set to discharge mode first, to avoid any memory effect. I was surprised how long discharging then took, the recovery had already charged the batteries quite a bit. But you are right, only time will tell if the batteries survived this incident.

[@Brrrap743]

Id connect it a few times every time it faulted and then it will read minimum voltage

[@coryengel]

Did it work?

[@DrCassette]

I was able to later fully recharge the batteries on my usual fancy charger. However, I have not put them back into use again yet, so I don't know if the charge capacity has suffered from this incident.