NiteCore UM2 vs UMS2

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Icarus
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NiteCore UM2 vs UMS2

I noticed the UMS2 cost nearly double the price of the UM2. So, what are the differences and is the UMS2 worth the extra cost and why?

 

I have several chargers (all from XTAR) but now I'm looking for a charger to connect to a foldable solar panel to charge my lithium and NiMh batteries. All thoughts and ideas of what to buy are very welcome. 

 

Thanks.

Edited by: Icarus on 02/03/2021 - 21:53
d_t_a
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Try checking the in-depth reviews by HKJ. (search for the model name).

The most basic characteristics of these 2 chargers are listed in the table here (clicking the name goes to the review of each charger)

https://lygte-info.dk/info/roundCellChargerIndex%20USBIn%20UK.html

Icarus
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Thanks for the link! 

daffyh67
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My UMS2 carked it recently, one of the few chargers that fits longer protected 21700 cells.
Got the Vapcell S4 arriving tomorrow.
It was a little over 2 years old.

gravelmonkey
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Following this thread as I’ve got a UM2 because I didn’t realise there was a ?newer version.

Possibly a difference in the charging algorithm? HJK and others said the termination voltage for Li-ion was 4.25v for the UM2.

Icarus
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OP updated. 

zeljko9r
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I bought UMS2 a few days ago. LiIon termination voltage is 4.13V. It seems to me.. not so good. What do you think?

I don’t know why I bought this charger, it does not have a power bank option. I think I will get something for single cell with usb output.

ChibiM
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I have the UMS2 as well, fits the longest 21700 cells I have with easy. Most chargers don't.

That's the main reason I bought it.

 

Lux-Perpetua
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zeljko9r wrote:
I bought UMS2 a few days ago. LiIon termination voltage is 4.13V. It seems to me.. not so good. What do you think? (...)

That is more or less in line with HKJ's observation in his review. Mine leaves topped up batteries at resting voltages around 4.14 - 4.16V. Not great, not terrible.

If you are looking for a charger that clocks in at 4.20V check for Miboxer C4 or C4-12. All my Miboxer chargers settle very exactly at 4.20V (+/- 0.01V). It seems they have a much lower termination current (10mA or less) in the final CV phase. I have a Vapcell S4+ charger incoming. I hope this one will charge close to 4.20V, too.