E-mag charger

[feildsweeper13]

I looked around the forum and found a thread that said that the car charger runs 14.4 into the charger. I didnt get a charger with my emag and I blew money that I have'nt even been paid so of coarse I'm too broke to afford a charger for my battery thats running low. Anyway, I have a 14.4 drill with a charger that turns off(unlike the agd one by what I hear) when the battery is fully charged. Would I be ok if I ran jumpers from the terminals on the charger to the battery BEFORE I plugged it in? If so, how long would it take to get a good charge on a near dead battery. My charger says:

In:120v AC, 60Hz
Out: 14.4v DC, 1.3A
CLASS 2 POWER SUPPLY

[FlawleZ]

Well, here's what my E-Mag charger's output/input

NIMH Battery Charger
16.8V/650 mAh
Input 10-15 VDC

And when the light turns green it's done so I usually just kinda watch mine every so few minutes and unplug it when it's done charging.

[feildsweeper13]

is it a radio shack or an agd?

[FlawleZ]

is it a radio shack or an agd?

AGD.

[feildsweeper13]

I'm trying to rig up something cheaper because I'm broke, and will be broke for a long while so I cant afford 80 for a charger and another 10 for a cord.

[feildsweeper13]

Does anyone know how to get around this???

[Spacemanvic]

Just remember this:

You blow your battery, your out the $40 for a battery, $80 for a charger and $10 for the wire....

[feildsweeper13]

Good point..... I guess I wont be playing for a while.

[11 Bravo]

I am not sure where I read it, but I think it was on this forum or in a link from this forum. Any way I saw that you can use a 12v charger from radio shack. I would search and see if you can find that info. It explained how to do it and also described exactly what charger to get.

[feildsweeper13]

I found that link but it only shows you how to do a house charger. The charger unit itself(part no. #1487) is what I'm trying to bypass.

[No Excuse]

You can knock up a simple trickle charger very easily.

You will need a regulated DC power supply (around $10) a resistor and a diode (less than 1$ each). The output voltage of the DC power supply needs to be a couple of volts higher than the output voltage of the battery. EG when I charge the 6V batt in my angel, I use a 9V adapter.

You use a resistor to limit the charging current from the DC supply, and a diode to prevent current flowing the other way.


Heres how to wire it up:
The + from the power supply goes to the + of your diode, the - from the diode (the side with the black line) goes to one leg of your resistor, the other side of the resistor goes to the + of the battery. Connect the 0V from the battery to the 0V from the DC supply.


Heres how you calculate what resistor you will need: (In practice you are unlikely to find the exact value you have calculated, instead pick an available resistor that is slightly bigger than the calculated value.)



Your trickle current should be roughly 1/10 of your batteries nominal current output. Which is probably about 1amp. If its slightly more or less it doesnt matter.

The voltage accross your resistor is the voltage of your power supply - 0.7V (for the diode) - the voltage of the battery.

The resistance of your current limiting resistor = the voltage across the resistor / the trickle current.



I have used simple chargers like this on my angel and my emag without any problems...
I always leave it overnight to charge but it works very well..

[Phobos]

The radio shack power supply supplies the AGD battery charger. Its a $25 set up that replaces your $10 cord so you can charge at home.