Rechargeable batteries and wallwarts

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76nemo

76nemo

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Location
Ogdensburg, NY
I was asked a question today that completely stumped me. My brother misplaced his wallwart for his 2,000,000L light we use for coyote hunting. He found a bag of six:-?, and asked me what one was which, a couple weren't marked.

I quickly said, "No problem, I'll go home and look at mine". Well darn it, misplaced mine as well:mad:

He used the one he was sure was the one that belonged with the unit. It won't charge. Wart says 6V out and I get 10:confused:

I know I can contact the manufacturer, that's obvious. My question is,....is there any kind of charting/formula for recharging different size batteries where I could figure this out by myself depending on battery specifics? Never been asked this before!


I have yet to yank the battery for it, just curious as to if this is something one could figure out on their own with the listed spec's that come with the unit. Anyone:confused:
 
Mebbe the instruction manual has the info.

If not, Google the manufacturer, see if they have a website, and maybe you can download the manual for it.
 
480sparky said:
Mebbe the instruction manual has the info.

If not, Google the manufacturer, see if they have a website, and maybe you can download the manual for it.
Click to expand...


I can easily do that Ken, I want to know if I, myself could figure it out on my own considering what specifically the type of battery was.
 
I don't have hunting in my blood, everyone else in my family does. You think your adrenaline gets pumping when you see a ten point. Imagine it being 1:00am in the morning by the moonlight and having 10-15 coyotes closing in on you. I've got 3 1/2" #2 buckshot that says,...."Let's rock and roll". THAT's adrenaline!!!!!
 
76nemo said:
He used the one he was sure was the one that belonged with the unit. It won't charge. Wart says 6V out and I get 10:confused:
Click to expand...
That's no doubt the unloaded voltage output.

A 2M CP light most likely uses a 12v H4 bulb, so you should look for a charger rated somewhere between 12-14v, and probably in the 300-500ma range.

Also, make sure the output is DC, like a car cord would be, and the plug is most likely going to be center-positive. It'll probably have a 5.5mm/2.1mm sizing.
 
090217-2150 EST

My high power flashlight is labeled 12 VDC on the connector and center positive. I have two jacks. One for the wall DC supply and the other for car charging. Using the car charger cable in both jacks showed no voltage. Therefore, there is an internal series diode and I expect a series current limiting resistor.

Going in thru the battery jack current starts to flow at 13 V and increases very rapidly with very little increase in voltage. This clearly has a low internal series resistance. In a car with the engine not running it is unlikely there would be any charging.

Going thru the line charger jack current starts to flow about 13.5 V and is 14 V at 200 MA. The charger open circuit voltage is 17 V and rated at 12 V 1.5 A. This path has higher internal resistance and maybe other circuitry than a diode only.

.
 
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