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Some advice Please.

dieselmarine

dieselmarine

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I just bought this nice solid/sturdy Ryobi flashlight and I would really like to make it into a 445nm laser. The battery and charger was sold separately, The battery is a 4V 6Wh, So heres what I would like to know what driver should I use ? What kind of resistors or diodes will I need to drop the current from the battery so that it does not destroy the driver?
-Sarge
 

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Meatball

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I don't see why a flexdrive wouldn't work that. As long as its safe for that battery to be run down to 2.2V, it will be fine.
 
chipdouglas

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^^^^. your batt could be a car bat and the flex drive will still work. just check your batts voltage after you charge it to make sure it is not higher than the 5.5 input of the flex.

michael
 
dieselmarine

dieselmarine

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6Wh is way to much for a flex drive to handle, I tried powering up a flex drive
set@800mA for a 445nm 750mW laser with 3x AAA Energizer Advanced Lithiums, It didn't work the diode was blinking and the flex drive got very hot and when I put in some duracells it worked perfectly. A car battery will destroy a flex drive unless the amps are dropped down!

-Sarge
 
Meatball

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6Watt hours? Is there some kind of minimum current draw for this type of cell?

The flexdrive should not draw any more current than it needs at those 4V.

Did you perhaps, mean 14 Volts instead of 4?
 
dieselmarine

dieselmarine

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Meatball said:
6Watt hours? Is there some kind of minimum current draw for this type of cell?

The flexdrive should not draw any more current than it needs at those 4V.

Did you perhaps, mean 14 Volts instead of 4?
Click to expand...

No its a 4v 6Wh battery, thats all I know thats why I asked for some help!
what does 6Wh stand for?
-Sarge
 
Last edited:
Meatball

Meatball

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6 Watt-hours

It can provide 6 Watts for one 1 hour, or 1/6 Watts for 6 hours.

It capacity, instead of millAmp hours- mAh,

it's Amp- hours.
 
chipdouglas

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please check your voltage at full charge. that is the most important thing here.

michael.
 
qumefox

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You have it backwards dieselmarine. Battery capacity doesn't matter (unless it's not enough) The more the better. Capacity, regardless of what units it's measured in, is always more = better. The more capacity, the longer the runtime you'll get from it.

What matters is the voltage. The max for a flexdrive is 5.5v. My guess is the energizer lithium's you tried were probably close to 2v per cell new and you were just giving the flexdrive more voltage than it was happy with.

BTW 6Wh @ 4v = 1500mAh.
 
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