Using old laptop cells for "lighter" power tools


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ilysion

New member
Joined
Nov 10, 2021
Messages
1
Hello,


I have a bunch of old makita 18v 3A battery cases laying around. I was wondering if using salvaged laptop cells to rebuild them works for use in a vacuum cleaner, lights or even drill for like drywall installation etc.
Also to be safe, I would paint those cases in another color to avoid using them for saws or any other heavy loads.



Has anyone been successful with using laptop cells for power tools? I'm still worried about the initial voltage drop when the motor starts up (since most makitas cut off at low voltage).
 

OffGridInTheCity

Active member
Joined
Dec 15, 2018
Messages
2,121
Its a matter of voltage drop vs power drain - especially at tool startup. If you can build a large enough battery you can overcome this. If you must keep the battery very small (as in the original container), then high-drain cells are likely needed. Battery Clearing House has a selection of high-drain DIY cells for purchase at pretty modest prices that you can recover the individual cells - here's an example: https://www.batteryclearinghouse.com/products/30-cells-high-grade-lg-mh1-10a-3ah-cells-in-10s3p-pack and they are a reputable US source based on my experience.
 

Korishan

Moderator
Joined
Jan 7, 2017
Messages
6,937
There is no real difference in weight between Laptop grade (ie, low current, high(er) capacity) and Power tool grade (ie, high current/discharge) cells.
You wouldn't get much gain going with laptop cells unless "run time" is your primary goal.
 
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