Xtar VP2 won't stop charging!

witness · Aug 16, 2017

I have a Pila charger but recently got an Xtar VP2 for it's versatility. Whenever I charge my 18650s (on 1A) it takes it up to 2.0 V but the light stays red and shows it's still charging. Shouldn't the light go green and the charging stop when the battery is fully charged?

ven · Aug 16, 2017

2v? So the cell voltage on the readout shows 2v is this correct? If so the cell is no good, would not try and charge it. When fully charged, the cell should be around 4.2v and yes it turns green when the charge cycle is complete.

bltkmt · Aug 16, 2017

Sounds like a bum battery.

archimedes · Aug 16, 2017

Yes, 2.0V is below the range to even safely start charging (!)

witness · Aug 16, 2017

archimedes said:
Yes, 2.0V is below the range to even safely start charging (!)

Oops, sorry for the typo guys

. I meant to say 4.0V but, more importantly, about 1/2 an hour after I wrote this the light on my Xtar VP2 did finally go green. I guess it just takes a while to reach that last fully charged level.
Anyway, thanks every one for taking the time to reply.

ven · Aug 16, 2017

Yes, the last part of the charge does/can take a while. The charger rate will not be at 1a coming to the end, maybe 0.3a............maybe less. So its not unusual to see 4.18 or 4.19v for a good few mins-1/2hr or so. In fact, if you remove the cell when its close to 4.2v and before its finished the cycle, measure the V after 5 mins or so(or simply put back on the charger after a few mins). You will see the voltage closer to 4.15v once settled.

witness · Aug 16, 2017

ven said:
Yes, the last part of the charge does/can take a while. The charger rate will not be at 1a coming to the end, maybe 0.3a............maybe less. So its not unusual to see 4.18 or 4.19v for a good few mins-1/2hr or so. In fact, if you remove the cell when its close to 4.2v and before its finished the cycle, measure the V after 5 mins or so(or simply put back on the charger after a few mins). You will see the voltage closer to 4.15v once settled.

Actually, it stayed at 4.2 for about 20 minutes or so. It did go green though, so I'm not worried.

ven · Aug 16, 2017

witness said:
Actually, it stayed at 4.2 for about 20 minutes or so. It did go green though, so I'm not worried.

Thats normal

archimedes · Aug 16, 2017

Might also be worth mentioning that "last" ( ie, "top" ) ~ 10% charge puts the most wear on the cell ....

That's oversimplified a bit, but I usually don't mind taking mine off the charger a little early :shrug:

peter yetman · Aug 16, 2017

You do realise that 18650 Li Ion cells are 3.7 volts nominal and that if they drop too low, iro 2.4 volts, they should be disposed of?
I may be stating to obvious, but you never know.
P

archimedes · Aug 16, 2017

witness said:
Oops, sorry for the typo guys . I meant to say 4.0V ....

peter yetman said:
You do realise that 18650 Li Ion cells are 3.7 volts nominal and that if they drop too low, iro 2.4 volts, they should be disposed of?
I may be stating to obvious, but you never know.
P

Yes, it was a typo :ohgeez:

peter yetman · Aug 16, 2017

witness said:
Oops, sorry for the typo guys

That's a relief, I was concerned.
Sorry it must have taken me about 15mins to post, so I missed all the new stuff.
P

Xtar VP2 won't stop charging!

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