Any hope for dead TF 10440?

Batteries and Chargers Rechargeable Batteries
1

I run 10440s in my EDC light. I swap them out every week or so to keep them topped off. A have a couple of black Trustfire 10440s in the rotation. When I went to swap batteries this morning the one in my Opus BT-C3400 showed null. I can barely get a reading from it on my digital meter. I can get 0.1v but it drops to 0v almost immediately.

Hoping my Opus didn’t kill it. I left it in there for a week, but given the features of the charger I didn’t think this was an issue. Is it possibly just a bad battery? Any way to get it charged?

2

It can hope to be reborn as an efest. :bigsmile:

3

I have similar dreams as Halo… I hope it makes it safely into a recycle bin and you pick up a few new Efests from MtnElectronics :beer:

4

Got it. Most of other LiIons are Efest. Heard about issues with the TFs - got a couple when I was in a hurry. Oh well.

Thanks.

5

Are your TF 10440s protected? Be aware that efest 10440 are not protected.

6

Yes and thanks for the tip. Aware that my Efest aren’t protected. Hasn’t been an issue for me. I try to not leave them in my charger too long but the Opus seems to handle them well regardless. I have other sizes of Efest unprotected batts as well - no issues so far.

I left the TF in the charger for a week because it’s protected. I figured even if the Opus wasn’t as well-behaved as it should be there wound’t be an issue.

7

With 10440s, over discharge is something to watch for as most aaa/10440 don’t have low voltage cut off. You could consider transplanting the protection board from your TF to a new efest. :bigsmile:

8

Hmmmm… never would have considered that. But the TF is toast anyway.

Thanks for the discharge note. I generally try to keep mine topped up and will be sure to not let them get too low.

9

I don’t like boost drivers with lithium ion cells. Better to get one light for 10440 and another for AAA. With direct drive or a “linear” driver you can tell the cell needs charging by the reduced output.

10

Most of my lights are regulated - I assume that’s the same thing(?). My EDC light certainly is. It gets a lot of use but never for much duration. The only risk to the battery is me accidentally leaving it on. It won’t get enough usage to go too low before I swap it out.

The wife uses some non-protected 18650s for work. Her light gets far more usage than any of mine. Hasn’t been a problem so far. Regular rotation with other batteries. Those things apparently go forever.

All things being equal I would choose protected for ease of maintenance and lower risk. Ironic that the only cell I’ve lost so far is a protected one.

11

maybe the protection board died?
not that it even has one despite claiming so.
any xxxfire batteries are a toss first ask questions later here.
buy junk buy many times.
buy quality buy once.

12

Yep. They were the first Li-Ions I bought before I started reading here and other forums. Everything else I have are Efest.