Has it got a conductor in or on it.?
- Thread starter 123hotchef
- Start date
mr migwire
It's more fun with metal.
- Messages
- 1,874
- Location
- fife
just posted a pic in my edited post above...
123hotchef
Member
- Messages
- 14,343
- Location
- Kent
i am learning about batteries now didnt know there were so many
Yeah I seen but still no wiser. lol
mr migwire
It's more fun with metal.
- Messages
- 1,874
- Location
- fife
its just a plastic tube that makes the battery fatter to take up the space this would fill... http://www.lightinthebox.com/18650-...214569159674&gclid=CL3V253n9s8CFUGNGwodp0kCOw
GW8IZR
Gone.
- Messages
- 2,323
- Location
- Anglesey
Just beware that things like torches, particularly head torches are mainly designed to work with low power batteries, for example dry cells, Duracell etc and as such don't really have much by way of circuit protection in them. If you substitute the low power battery with a high power li-ion battery the cell is capable of generating huge currents, more than enough to melt the wires connecting the cell pack to the torch unit. If that happens when its on your head it will smart.
Its just something else to think about when modifying the design as well as the longer run time.
mr migwire
It's more fun with metal.
- Messages
- 1,874
- Location
- fife
most led torches are supplied with the AA cartridge or the adapter for a single 3.7v cell...
GW8IZR
Gone.
- Messages
- 2,323
- Location
- Anglesey
But the race for more capacity means more energy and more risk and maybe the designer didn't consider that future change, dunno.
I have an LED lenser thingy head torch and between the bit on the back of your head and the dimmer / power circuit there is a wire.. no protection at all. In the event of that dimmer failing the full power would be dumped into the regulator strapped to your head.. its just something to think about.
123hotchef
Member
- Messages
- 14,343
- Location
- Kent
fook that i am leaving the 3 aaas in the head torches then
GW8IZR
Gone.
- Messages
- 2,323
- Location
- Anglesey
To be fair it would be really easy to fix, it just needs a very small wire ended fuse, then you get long run time and it shouldn't set your head on fire if it all goes wrong.
Something like this would prob do the job:
http://www.ebay.co.uk/itm/like/1220...=1006608&device=c&campaignid=661151662&crdt=0
Something like this would prob do the job:
http://www.ebay.co.uk/itm/like/1220...=1006608&device=c&campaignid=661151662&crdt=0
Migmac
Forum Supporter
- Messages
- 8,619
- Location
- Kintyre. Scotland
Been using the 18650 batteries in torches and head torches for a few years now, never had any issues. Bought a cheap dive torch off the bay( I don't dive, live in soggy Argyll) it works with three AAA batteries. Fit a 18650 ino and it works just the same, no heat coming from any where it's not meant to
123hotchef
Member
- Messages
- 14,343
- Location
- Kent
do they last longer than 3aaa's? do they alos just stop working when a charge is needed or do they run dimmer and dimmer like the standard AAAs
GW8IZR
Gone.
- Messages
- 2,323
- Location
- Anglesey
These cells appear to be the brand 'UltraFire' as per ebay .. good marketing name :-)
At least the fire happened when it was on charge not on someone's head, only set the bedroom on fire.
<edit> also worth watching this youtube video of a cheap Chinese cell with no protection
At least the fire happened when it was on charge not on someone's head, only set the bedroom on fire.
<edit> also worth watching this youtube video of a cheap Chinese cell with no protection
Last edited:
probably not real ultrafire cells, there's loads of fakes coming out of china
saw some on an ebike forum ,the cells had a couple of watch batteries inside them, bare wire joining them up the the ends of the battery and then they were full of flour to take up the extra space!
(and there were loads of them, not just one or two)
saw some on an ebike forum ,the cells had a couple of watch batteries inside them, bare wire joining them up the the ends of the battery and then they were full of flour to take up the extra space!
(and there were loads of them, not just one or two)
Migmac
Forum Supporter
- Messages
- 8,619
- Location
- Kintyre. Scotland
They do last longer, how much I'm not sure. They go off without warning when flat
