Torches flickering when using certain RCR123s

[gadgetnerd]

Hi all, I hope you might be able to help me with an interesting phenomenon I've observed.

I recently bought 4 unprotected RCR123's from lighthound for use in my HDS/Novatac/Ra torches. All of these lights can handle unprotected RCR123s gracefully, so I don't bother with protecteds.

http://www.lighthound.com/index.asp?PageAction=VIEWPROD&ProdID=2574

I charged all the batteries up in an Ultrafire charger and have been using them for a few weeks without problems. However I noticed that one of the batteries actually causes the torch (any of them) to flicker every 2-3 sec. If I put one of its siblings in the torch the flicker goes away. The thing is if I measure the offending cell its voltage is the same (~4V) as all of the others.

The torches are all well looked after, lubricated and have isopropanol cleaned contacts.

Has anyone seen this or have an explanation for it?

EDIT: Oops I realised I posted in the wrong thread by mistake. Sorry Mods!

 

[Misterbean]

sounds like the battery could have a dented/damaged contact that is making it loose contact with the flashlight. i know you probably have checked that already but thought i'd mention it.

 

[gadgetnerd]

Thanks Misterbean, yeah I already checked that. The torches flicker even if sitting untouched on a stable surface.

I'm pretty sure it's some kind of weird internal resistance problem with the cell, but I'm not an electrochemical engineer...

 

[Misterbean]

it does sound like it is an internal problem with the battery. it may have problems delievering a constant high current. have you tried it in those lights on the lowest output settings? in any case it looks like you have a busted cell(might be able to return it).

 

[SilverFox]

Hello Gadgetnerd,

Interesting problem...

Flickering can be caused by poor contact. Are you able to see any physical differences in the cell that is not working properly?

On the other hand, it could be a problem inside the cell and you should probably get it replaced.

I will move this thread over to the battery and electronics section.

Tom