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2023-11: Warosu is now out of extended maintenance.

/diy/ - Do It Yourself

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1185038 No.1185038 [Reply] [Original]

Getting hard to find quality Ni-cad batteries. Chinese ones are crap. Less than 6mo old won't hold a decent charge.

I have a fuck ton of B&D 20v yard tools and miscellaneous shop tools.

Don't want to thow away my trim saw yet.

So I cut up an old dead battery pack and sacrificed one of the cheapo 20v chargers to make an adapter.

> yes I know dewalt makes an adapter to use their 20v batteries on the old 18v tools, but this is the only dewalt thing I own. And all the batteries for it are junk.

>> No.1185041
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1185041

Bottom of the adapter

>> No.1185043
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1185043

Screw holding adapter to tool

>> No.1185046
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1185046

I took the top off the charger.

>> No.1185047
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1185047

The screws holes in the charger line up with two plastic posts on the battery lid.

>> No.1185051
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The terminals that interface with the tool were originally held inplace by one of the battery cells. So I used a peice of wood and a couple shims and to hold that up in the stem of the adapter and another piece with a notch to give support to the front of the charger bracket.

I then pre-drilled a hole through the wooden pieces and put in a screw to secure them.

>> No.1185052
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1185052

The battery fits snug in the old charger bracket.

>> No.1185056

I also bent a piece of galvanized wire and inserted in into two of the other posts to make a latch for the battery.

No modifications other than a 1/4" hole for a retaining screw were done to the actual tool.

>> No.1185058
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1185058

Forgot last pic.

>> No.1185062

I forgot to say I used a short piece of 14ga stranded copper wire to go from the charger terminals to the old battery terminals in the stem.

The electronics in the charger are completely bypassed. I most soldered directly to the pins that come through the circuit board connected to the tangs that interface with the 20v battery.

>> No.1185104
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1185104

>>1185038
why not just get a black and decker circular saw then toss the rest? $40 for a 5 1/2in blade, not the best but thats what you get from B&D these days. neat that you can hotwire a new battery on but for most people its too much work and they'd rather toss the whole thing and start from new.

https://www.amazon.com/BDCCS20B-20-Volt-Lithium-Ion-Circular-5-5-Inch/dp/B00FRMSMRE

>> No.1185107

everytime i need 18v dewalt batteries i just buy one of these:

https://www.amazon.com/DEWALT-DC970K-2-18-Volt-Compact-Driver/dp/B002RLR0EY/ref=sr_1_3?s=hi&ie=UTF8&qid=1496115252&sr=1-3&keywords=dewalt%2B18v%2Bdriver&th=1

$75 for 2 batteries, new drill, and a charger....

>> No.1185111

>>1185107
I would but I'm done with ni-cad.

>> No.1185118

>>1185104
I will do that when this one is dead.
I always try to repair or upcycle what I have before I buy new.

This cost me nothing but 40 mins of my time on a Sunday.