Li-on/NiMH charger that will refresh NiMH before charging?

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Gregerg
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Li-on/NiMH charger that will refresh NiMH before charging?

Hello I just joined after going a bit overboard ordering mostly Sofirn flashlights. I have an Xtar VC4 that I have been using for AA/AAA NiMH batteries. Full disclosure…I ordered the Xtar VP4 Plus Dragon yesterday after seeing a video of someone refreshing li-on batteries. I may have jumped the gun, since I don’t really need all the other features of the charger. I used to have a NiMH charger that did the refresh, and it died. https://www.amazon.com/gp/product/B003V89RYS/ref=ppx_yo_dt_b_search_asin...

I have been digging in the forums, and since refreshing isn’t necessary for li-on, it is hard to find people recommending what I’m looking for. BTW I have been using an Xtar VC4 for the AA/AAA charging, and may have messed up a couple of the slots. I would put batteries in any slot, but maybe I should have been making sure I used either 1 and 4, or 2 and 3…and not 1 and 2 for example.

Thank you for any tips!

Edit: ok I’m finding a few threads now that I’m searching for “refresh” instead of “drain before charging” lol

Edited by: Gregerg on 07/22/2022 - 13:25
Jimmyrig
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Nimh batteries generally don’t need to be discharged before charged.

Now if you want to try to recover some old ones that is a helpful feature. For that I prefer a generic charger like this that can charge and discharge just about anything (lipo,nicd,nimh,life,lead acid, etc). Plus they have much higher discharge rates than the aa chargers with the ability to cycle 5x times

Lots of different models exist here is one. Just get a cheap battery case and you are good

https://hobbyking.com/en_us/turnigy-accucel-6-80w-10a-1-6s-balancer-char...

ChrisGarrett
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If you have a discharging NiMH charger, just cycle them full and then empty a few times to spread the electrolytes around.

That’s just about the best we can do before the I.R.s (internal resistance) begin to climb and they’re ready for the recycle bin.

“Conditioning” is kind of misnomer.

Chris

Johnny_Bravo
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Jimmyrig wrote:
Nimh batteries generally don’t need to be discharged before charged.

Uhm, NiMH don´t have a memory effect like NiCd but there is still the lazy battery effect for long stored cells, but it´s not so problematic like the memory effect. Maybe a charger with a fast test mode (discharge and charge) is good enough to eliminate the effect.

lampliter
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I always do a Fast test on my Litokala Lii 500 for all my newly purchased nimh batteries to see if they’re near the mah written on the wrapper.

"The marvel of all history is the patience with which men and women submit to burdens unnecessarily laid upon them by their governments.” ~ U.S. Senator William H. Borah (1865-1940) affectionately known as the "Lion of Idaho"

Gregerg
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Well now I regret spending so much on the VP4. Came out to $79 after shipping. Thanks to everyone for explaining.