# Replacing a Ni-Mh battery to AC input?

1. Sep 6, 2009

### hermtm2

Replacing a Ni-Mh battery to AC input???

Hello,

3. Sep 6, 2009

### hermtm2

Re: Replacing a Ni-Mh battery to AC input???

I have a Makita 6223d. It is a set with a work light which use the same battery pack. I need 2 of them. Each one of the battery is \$75. Anyway I will try~.

Thanks.

4. Sep 6, 2009

### negitron

Re: Replacing a Ni-Mh battery to AC input???

There are also many places which will rebuild packs for you:

http://www.primecell.com/pctools.htm

Personally, I'm a DIY kind of guy but if don't think you can do it, the price is certainly right. Or at least better.

5. Sep 6, 2009

### vk6kro

Re: Replacing a Ni-Mh battery to AC input???

Cordless drills draw a lot of current, especially when you are working them hard.
Also, if you power them from the mains power, they are not cordless any more.

So, that would be difficult, but not impossible.

A better solution is to make up a battery pack and attach it to the drill with a short cable.
You would need to get a 12 volt battery from somewhere (like a motor cycle battery) and put it in a box that has a handle on it so you could carry it easily.
You can used the old battery holder as a connector to the drill. Just remove the old batteries and attach the cable to where the batteries used to connect.

You could also get about 10 NiMH (Nickel Metal Hydride) D cells and connect them in series to give you a 12 volt supply. You can get holders for these batteries at electronic stores, but not for 10 at a time. You might need 5 holders with 2 batteries in each.

You would have to arrange a charger, too. This should be one that detects when the battery is fully charged and stops the charging.

Before starting this, get a price on a new drill. It may be cheaper than making up a new battery pack.

6. Sep 6, 2009

### waht

Re: Replacing a Ni-Mh battery to AC input???

Basically under heavy torque the current can peak above 20 amps. So unless you can find a suitable switching power supply, the simplest solution it to rebuild the battery pack.

7. Sep 6, 2009

### hermtm2

Re: Replacing a Ni-Mh battery to AC input???

huh...

Rebuild not a DIY...

Thanks.

8. Sep 6, 2009

### vk6kro

Re: Replacing a Ni-Mh battery to AC input???

I've tried that a few times and it always works out cheaper to get a new drill.

Also, they seem to put them together with strips of stainless steel joining the batteries so you have to silver solder them. Did you find that?

9. Sep 6, 2009

### hermtm2

Re: Replacing a Ni-Mh battery to AC input???

I just sas the video on Youtube.

10. Sep 6, 2009

### hermtm2

Re: Replacing a Ni-Mh battery to AC input???

I can't even find how to disassemble the battery pack. I would like to see inside before it goes to gabage can.

11. Sep 6, 2009

### negitron

Re: Replacing a Ni-Mh battery to AC input???

Probably sealed. You've got nothing to lose by carefully cutting it open along the seam, since it's dead anyway. But first, look under any labels, since manufacturers like to hide screws there.

12. Sep 6, 2009

### hermtm2

Re: Replacing a Ni-Mh battery to AC input???

There was not the hide one. Also it seals completely.

13. Sep 6, 2009

### negitron

Re: Replacing a Ni-Mh battery to AC input???

Time to break out the hot knife.

14. Sep 6, 2009

### vk6kro

Re: Replacing a Ni-Mh battery to AC input???

Look for hot glue, too. A hot air gun will melt that OK.

If all else fails, my angle grinder will make short work of most things. Putting it back together afterwards is the hard part.

Even a bit of red-hot nichrome wire will slice neatly through plastic.