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Author Topic: Battery voltage for my little flashlight ?  (Read 4374 times)

Offline Bob Masters

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Battery voltage for my little flashlight ?
« on: June 12, 2001, 02:37:00 pm »
I have several of those old palm-sized flashlights from the early 1900's and they take a wierd battery pack about the size of two AA batteries. Can anyone tell me if two
AA batteries equals the original voltage soz I'll know whether-or-not to run them in series or parallel.
My old battery pack doesn't state the voltage on it.........and its a Rayovac !

Thanks !
-Bob-
« Last Edit: November 14, 2004, 01:53:54 am by tim »

Offline Chris W. Millinship

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Battery voltage for my little flashlight ?
« Reply #1 on: June 30, 2001, 06:56:00 pm »
Hmm, must have missed this one before.

Anyway, I`m no expert on early flashlights or the batteries they run on (is that battery pack an original then? normally those old carbon cells corroded away didn`t they?) but I reckon the simplest way to find out your light`s voltage is by trial and error. Hook a single AA cell to it- the zinc carbon type not the new fancy lithium ones cos their voltage is ever so slightly higher- improvise connections if you have to. Then see how bright the bulb is. If it`s dim, you`re probably safe to try 2 AA cells in series. If it`s fairly bright, you`ll probably only need one cell (or 2 identical ones in paralell). Unhook it right away if it`s bright white to prevent any damage- but that`s doubtful on just one cell.

If you have access to a variable power supply that goes from 0 volts upwards, smoothly variable then you could try that- keep turning the voltage up until you think the bulb is at about the right brightness, then take note of the setting. I`m sure you know that vintage flashlights don`t burn as bright as modern ones do- take care. It`s all too easy to turn the volts up too far and fry your poor light`s bulb.
But I doubt any flashlights would have operated on less than 1.5 volts so you`re probably OK with the battery test.




Offline Scott

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Battery voltage for my little flashlight ?
« Reply #2 on: July 02, 2001, 10:07:00 pm »
I'd guess three volts, or two cells in series. it's rare to find an old flashlight that uses more than a 6 volt battery,but I'd start off easy with a single "AA" first. Is the bulb the usual threaded base miniature one? If so, I'd put in a new one and not risk the old one. Most flashlights-new and old-are of the two cell(3 volt,tho' the bulb may be stamped 2.47 or some such)type.