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Post by Deleted on Feb 17, 2020 17:35:29 GMT
Lately I've become a little obsessed with reviving dead batteries. I didn't have much luck with some AGM batts, but I had a few NiMH and NiCad items for power tools which were well used and suffering badly from memory effect. I put them on a series of discharge / charge cycles using a quite cheap Chinese pulse charger item with, I have to say, good effect. I don't entirely believe the displayed values but the Ah capacity has been improved to a usable degree. I think with repeated charge/discharge treatments I might see further improvement. I seem to have better results with NiCad over NiMH.
Anyway, just watched a youtube video of someone reviving a lithium batt that the charger reported as faulty and therefore useless junk. The fix was to hook the defective batt to another with a higher AH rating and leave it for a while, then re-attempt to charge the lithium batt. It then accepted a charge.
Anyone tried this with a automotive-size lithium battery?
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Post by Deleted on Feb 17, 2020 17:38:42 GMT
Lithium batteries will result in the end of the world as we know it.
They look good but in reality it's a sheep in wolf's clothing.
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Post by naughtyfox on Feb 17, 2020 18:02:37 GMT
I suppose it's a hobby that keeps old people off the streets.
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Post by Deleted on Feb 17, 2020 20:52:42 GMT
Lithium batteries will result in the end of the world as we know it. They look good but in reality it's a sheep in wolf's clothing. Well I hear they require some really specific maintenance conditions. But whats your objection? |
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Post by JohnV on Feb 18, 2020 1:16:36 GMT
Lithium batteries will result in the end of the world as we know it. They look good but in reality it's a sheep in wolf's clothing. Well I hear they require some really specific maintenance conditions. ?? LiFePO4 less so than Pb's IMO ........ you want batteries to abuse totally ? try NiFe or H2O |
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Post by peterboat on Feb 18, 2020 10:48:56 GMT
Lately I've become a little obsessed with reviving dead batteries. I didn't have much luck with some AGM batts, but I had a few NiMH and NiCad items for power tools which were well used and suffering badly from memory effect. I put them on a series of discharge / charge cycles using a quite cheap Chinese pulse charger item with, I have to say, good effect. I don't entirely believe the displayed values but the Ah capacity has been improved to a usable degree. I think with repeated charge/discharge treatments I might see further improvement. I seem to have better results with NiCad over NiMH. Anyway, just watched a youtube video of someone reviving a lithium batt that the charger reported as faulty and therefore useless junk. The fix was to hook the defective batt to another with a higher AH rating and leave it for a while, then re-attempt to charge the lithium batt. It then accepted a charge. Anyone tried this with a automotive-size lithium battery? NIMH require dropping to a very low voltage with a light load the charging and holding there for 36 hours cycle 3 times and they are like new! I have them in my Honda insight and they are capable of 300k miles so long lasting if looked after |
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Post by Deleted on Feb 18, 2020 12:40:07 GMT
Thanks Peter, I shall persevere some more but I suspect the reason I'm having difficulty with one NiMH batt is that it has a dead cell. The batt is rated at 14.4v (drill and jigsaw item) and even after a trickle charge the voltage registered on a multimeter is below that, about 13.5 volts. I'm going for a deep discharge and try again one last time.
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Post by Deleted on Feb 18, 2020 12:41:41 GMT
Well I hear they require some really specific maintenance conditions. ?? LiFePO4 less so than Pb's IMO ........ you want batteries to abuse totally ? try NiFe or H2O Who said anything about abuse? |
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