Build Dirt Cheap power tool Battery Packs : Milwaukee Dewalt Makita

Building any power tool pack is easy and fun.

WANT it QUICK, order from Amazon:
Dewalt 10 cell 2p 5s 18650:
Milwaukee 10 cell 2p 5s 18650:
Makita 15 cell 3p 5s 18650:
Milwaukee M12 6 cell 2p 3s 18650:

SAVE a few bucks:
Wait a little while and get the same ones direct from China via Aliexpress or Ebay for just a little bit less. I don’t have links as those listings are constantly changing. Generally searching by a battery part number ie “Makita BL1850 case” for the brand you want will get you results.

Tools I use:
Torx security bits required to dismantle packs:
Soldering irons are cheap:
Dual cell ANY type battery charger I have:
Get a Multimeter as well, they’re cheap:
I use the Kester 951 no clean flux. It lasts forever

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Lithium Li-on 21700
Makita Packs BL1815N BL1820 BL1830 BL1840 BL1845 BL1850 BL1850B BL1860
Dewalt Packs 20V DCB201 DCB203 DCB204 DCB200 18V
Milwaukee Red Lithium M18 18V 3.0Ah 4.0Ah 5.0Ah

5 Comments

  1. In my years of frugality and salvaging…i’ve never had luck with recycled packs. They just love to unbalance. It is a huge time waster imo. Cells are NOT expensive when you buy 100+ at a time and well worth it. I’m not saying salvaging can’t work, but you need some idea of the battery’s history and how many cycles have been through it.

  2. Just did this recently for my Dewalt & Milwaukee 12volt batteries. Just the small 2/3ah batteries. Now they have the same punch as the 5/6ah batteries. Molicel P28s are on sale right now for about $2.50 a piece. 2800mah, 35a continuous. Hard to beat that. Really wakes these little tools up, and with the smallest lightest battery! M12 High Output 2.5s – I find them to be around $60. Total price for my higher output battery…about 12$. Now I’m thinking of making a 9ah (8.4) 105a CD M12 pack lol.

  3. This is nuts but such a good idea. Are you able to get big blank shells? Like HD or red forge shells?

  4. That’s only a 4Ah battery, not 6. Batteries connected in series do not increase capacity. They raise voltage.

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