UltraFire RCR2 at 0.6V

[TeK]

I've just received new UltraFire unprotected RCR2 batteries from Kai. I think it's a necessary practice to check the voltage of Li-Ion batteries before charging them. So I checked these and they show 0.6V. AFAIK, this is way too low for Li-Ion. Should I send these back to Kai?

 

[Steve L]

Yes the cell needs to be returned. It would be damaged if the voltage falls below 2.5v. The battery should not be charged. For that matter a smart charger will not even charge it.

 

[LGCubana]

Funny enough, I was just doing a spot check on my batteries. I found an UF, RCR2 with a reading of .6v

This battery had not been used; since it's last recharging, 1 month ago.

Using an UF, WF-138 (set to 3.0v), I was able to recharge it to 3.34v
Took about 45 minutes

[Edit to Add]
The charging at 3.0v was to test the battery. I'm going to complete the charging process at the 3.6v setting.

 

[HarveyRich]

LGCubana: How did you get the RCR2 to fit this charger? Did you use a spacer? If so what type and where did you get it? I have the UF WF-138 switchable. It's supposed to be used for RCR123 batteries, I thought, which is why the space for charging is too longer for the RCR2.

 

[LGCubana]

I've got a couple of the spacers that AW sells with his CR2 offerrings.

BTW, right off of the charger (set to 3.6v), the battery measured 3.81v
But within 1 hr. it read 3.4v
Now 12 hrs. later, it reads 3.34v

 

[al2k]

I just received four Ultrafire R123A cell from DX, two of them measured under 1 volt (one was leaking) and the other two can't seem to hold a charge for more than a couple days (charge to 4.2, then they're back down to 3.x overnight). This was my first order of non-AW Li-Ion cells and probably my last.

 

[mdocod]

sounds like crap. great evidence not to buy cells from "cheapo" sources.