recDNA
Flashaholic
- Joined
- Jun 2, 2009
- Messages
- 8,761
I have a multimeter but I don't know how I can test drain with the flashlight closed and if open contact is lost so no dra?
What light do you need to test?
If you can remove the tailcap put your test leads between the battery and the metal contact area of the tube. With your multimeter set on A or mA and your leads plugged into A or mA and common, put one lead on the battery's negitive contact and the other lead on the battery tube where the tailcap would normally make contact. While the light is off any reading you get is the parasitic drain.
Not positive on the TK40, but the others definitely have no parasitic drain.
The TK40 does have a nasty parasitic drain, even the manual says "If you leave the flashlight unused for a couple of days, please unscrew the head 2.5 turns to prevent slow discharge of batteries."
I have a multimeter but I don't know how I can test drain with the flashlight closed and if open contact is lost so no dra?
I was quoted that the TK40 would take about a year to deplete its nimh batts or 20 months to deplete lithium AA's. This is covered by HJK in the TK40 thread part three. Im not that worried about it after those numbers.
Im glad i don't have this light then. 20 months till complete drain may sound "ok", but when you considder your usage of the light, and a crucial need for light... If your batteries are not fresh, but "should" provide enough emergancy light even after months of non use, a paracitic drain may drain the batteries to the point of being useless.
If i am aware of a paracitic drain, i will simply not buy that light. It would have to be so small drain that it would take 10 years to drain the power, in order for me to even considder it. I heard that there is a light that has memory, yet no drain. I think that should be saught after by all manufacturors
Well, since "parasitic drain" is a feature of the design and not a flaw, why?
If you are storing your cells in the light long enough for it to matter, the cells don't need to be stored in the light even if it has no parasitic drain.
Well, since "parasitic drain" is a feature of the design and not a flaw, why?
If you are storing your cells in the light long enough for it to matter, the cells don't need to be stored in the light even if it has no parasitic drain.
Would you want to try to install 8 AA's in that holder in the dark?
Why not keep the batteries in the holder, then only install the holder when needed? There's definitely no parasitic drain in the battery holder itself. And if you drop it, easier to find one big holder rather than one (or more) AAs.
It is rather tricky to do that, any light, with a tail switch, where you can just remove the tailcap and measure the current drain, will not have any parasitic drain. It usual has to be lights with the switch mounted on the head or with 3 connections from the battery tube to the head.
Why not keep the batteries in the holder, then only install the holder when needed? There's definitely no parasitic drain in the battery holder itself. And if you drop it, easier to find one big holder rather than one (or more) AAs.
Well, since "parasitic drain" is a feature of the design and not a flaw, why?