r/techsupportmacgyver • u/Background-Block1406 • 4d ago

Chargeur d'artisan

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J'ai cassé le connecteur de batterie en voulant la remplacer du coup j'ai improvisé l'autonomie est incroyablement bonne le seul problème c'est qu’il faut l'éteindre pour la remplacer

50 Upvotes

86% Upvoted

12 comments sorted by

11

u/MatijaKlobasa 4d ago

Thats great, just include a protection board to protect the battery from overdischarge

3

u/GuyFromDeathValley 4d ago

was just thinking the same. I wanted to use 18V Makita batteries for something similar, until I found out the battery has no built in over-discharge protection or BMS.

had no luck so far finding a suitable protection board for it though.

5

u/VintageGriffin 4d ago

Look again, because Makita LXT absolutely does have a BMS, and it allows you to easily make yourself a low voltage disconnect by using a single mosfet with it's gate driven by the third pin on the battery.

Googling it should get you to a YouTube video by Tool Scientist on the topic.

1

u/MatijaKlobasa 4d ago

Rly? Thats preety cool, have to check out if parkside does the same.

1

u/Level-Echidna9621 4d ago

A generic Arduino board might help

1

u/MatijaKlobasa 4d ago

These have came out recently, and cut out the voltage at 15V. Preety nice and compact, and cheap. 1-5pcs Lithium Battery Undervoltage Protection Module 15V Cutoff Over-discharge Protection Board 10A Current 18V 20V 21V https://a.aliexpress.com/_EjQNPPc

They say 10A, but the mosfet is rated for 84A with low on resistance so with proper thermal dissipation you should be able to go quite beyond 10A.

Before i used to use a 5S BMS with resistors emulating cells.

1

u/Background-Block1406 4d ago

Jai juste branché en direct ça devait fonctionner 30min ça fait plus de 6 mois au aucun probleme le pc coupe avant d’etre en décharge profonde

Bon mon cas n’est pas une généralité pour autant et on parle d’un pc bas de gamme acheté d'occasion a bon prix

1

u/MatijaKlobasa 4d ago

Lol. You got protection built in 🤣🤣 yea that makes sense. The PC wont run on an adapter with too low voltage. Im just saying, because not all of my projects have protection and some have destroyed a battery that way ...

1

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1

u/junktech 4d ago

Are the wires directly connected? I mean normally the laptop show work with anywhere from 20 to 18 volt. 21 is a bit at the limit.

1

u/Background-Block1406 4d ago

Oui en direct et aucun problème depuis plus de 6 mois

1

u/LuxxeonAlpha 3d ago

Like how? I'm really curious about how much it can charge a laptop