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Cordless drill batteries


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My cordless drill batteries are not the Li-ion ones, whatever was in use prior to them ni-cad something..

And they don't like being left alone for six month. Twice now I've had to replace them with new ones when we return to NZ. They power the drill no problem when we leave but won't hold a charge when we return. I think the issue is Chinese made rubbish because we have a ni-cad(?) powered el-cheapo made in Germany drill on the boat and it is perfectly happy about being left alone for 6 months.

Is there (1) any solution to this and (2) has anyone ever opened up the battery pack a d replaced the cells with those rechargeable ones and if so is it worthwhile/successful?

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NiCad has an issue of growing little strings of crystals that short the cells out. They can often be restored,

Discharge till absolutely flat in the drill by leaving it running till the drill stops running, Then charge fully.
Make up a small load like a lightbulb or little DC motor. Then discharge till absolutely flat again, which may take overnight. then fully charge again.
Every now and then, letting the battery fully discharge and fully charge is good practice.

Yes the packs can often have lots of smaller batteries inside that can be replaced. But just whether you can get the right size to fit into the pack will not be clear till you pull the pack apart. Just solder wires between each battery. The real McCoys will be spot welded tabs.

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Can I expand this thread a little bit by asking.....what are a good set / brand of 12V chargeable drills to keep on my boat...?  Something better than cheap chinese sh%t but not so expensive I would have to take out a mini mortgage.

 

Ryobi 18v! They make a 12v>18v charger that fast and there is a huge range of tools that are reasonably priced, but also have a 7 year warranty.

 

One of my favorites in the range is this fan - sooo good when you stuck in the bilge doing a crappy sweaty job! We have two now!

 

36a856e1-0367-45d2-a974-1c0228a47d54.jpg

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NiCad has an issue of growing little strings of crystals that short the cells out. They can often be restored,

 

Discharge till absolutely flat in the drill by leaving it running till the drill stops running, Then charge fully.

Make up a small load like a lightbulb or little DC motor. Then discharge till absolutely flat again, which may take overnight. then fully charge again.

Every now and then, letting the battery fully discharge and fully charge is good practice.

 

Yes the packs can often have lots of smaller batteries inside that can be replaced. But just whether you can get the right size to fit into the pack will not be clear till you pull the pack apart. Just solder wires between each battery. The real McCoys will be spot welded tabs.

Thank you Wheels,

I figured you would come back with solutions. Going to try the deep discharge method you mentioned.

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There's a reason everything has gone li-ion these days.

Agree. But I've just bought a very nice scroll saw which required a very powerful presentation to the Keeper of the Purse for the release of the necessary funds. I think asking more for a new drill would be pushing my luck. Solution a la Wheels first.

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[Can I expand this thread a little bit by asking.....what are a good set / brand of 12V chargeable drills to keep on my boat...? Something better than cheap chinese sh%t but not so expensive I would have to take out a mini mortgage.]

 

B&D make a drill that has a heap of add ons. The drill head unclips and you then clip on what ever head unit you want. I have one and have found it really good. Only down side is the the Chuck is 10mm, not 13. You can get an impact screw driver head, Multitoool head and a few others I forget at the mo and they are not expensive nor take up a heap of room like an entire tool skin if you go down the track of Ryobi.

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