Hey everyone! I'm working on a power wheel conversion project and I need some help with the low voltage cut-off for M18 batteries. I've read that the low voltage cut-off should be around 2.5V for each cell, and since there are 5 cells in total, that would come to 12.5V. However, I'm wondering if I should set it a bit higher, like 3V per cell. Wouldn't that give better protection? I'm a bit confused here, so any insights or advice would be greatly appreciated! Thanks!
2 Answers
It sounds like you're really diving into this project! Just to clarify, the M18 batteries are designed with built-in protection, especially when used with Milwaukee tools. If you're using them in a different application, you're potentially voiding the warranty since the protection mechanisms may not function as intended. What exactly are you setting the low voltage cut-off for?
Just remember, the logic for voltage protection usually relies on the tool itself being present, so it’s a risk using them outside of Milwaukee's context.
Honestly, have you thought about using Ryobi batteries instead? They're cheaper, and they have built-in protection right in the battery, which might save you some headaches. For the cut-off, you're right—set it at the total cutoff voltage of 2.5V times the number of cells, which puts you at 12.5V for the M18—makes sense!
I'm adapting them for a power wheel! Got a step-down converter from 18V to 12V for now until I upgrade the motors. Looking to play it safe with how I set the low voltage disconnect.