You don’t have to worry about troubleshooting it if that’s the case, though. Because it’s a new battery, an issue like this is something the company will take care of for you.

These are the types of things that regulate certain functions of the battery. When they die, those functions begin to fail. This includes proper power flow and the capacity of the battery to hold charge.

Hi, I am Thomas Martinez, the owner of ToolCroze.com! As a passionate DIY enthusiast and a firm believer in the power of quality tools, I created this platform to share my knowledge and experiences with fellow craftsmen and handywomen alike.

But, if that different charger works and your current one doesn’t, you know the issue was because of the charger. You’ll have to buy a new one so that your battery can charge normally.

It was especially common at a certain time and with specific models of batteries. Users who just recently got their Milwaukee M12 battery likely got one with this defect.

M12battery diagram

So, it’s best to replace a Milwaukee M12 if it’s quite old and being problematic. The parts inside are starting to give in, and you’ll have to deal with issues until you get a new one.

M12battery jump start

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M126.0 not charging

Leave it for around 15 seconds and then disconnect it. Then, try to recharge it on the Milwaukee charger and it should now be charging normally.

Even if the cells are fine, if you have a really old Milwaukee battery, its components may just be dying. Dying chips or circuits are quite common after a few years of regular use.

As mentioned earlier, a flashing red and green indicates a bad battery. If it displays a flashing red, this means a hot/cold relay.

You would need another similar healthy battery here to jump start and reset the bad battery. Using two wires, connect the positive and negative terminals of the two batteries.

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Instead of buying a whole other charger, you could check if a local mechanic or even someone you know has one. Borrow it to see if the Milwaukee M12 battery charges fully with it.

If the charger was new too, you should be able to claim a warranty on that as well. Milwaukee will send you a new one after that, that works without any worries.

Something like that is a direct result of one of those cells losing their capacity. When one cell loses its capacity, it also loses its voltage. That means it’s out of balance with the other cells.

Once you have a different charger to try it on, plug the battery into it and see if that works. In case it doesn’t, you know that the battery is to blame, and not the charger.

So, once you get a new one, you can rest assured that it will serve you reliably for years, and give you your money’s worth without further hassles!

Talk to Milwaukee customer support. Tell them about the problem you’re having with your new battery. They’ll likely recall it, and send a new and fully functional one.

M18positive and negative

Before you’re set on blaming the battery and looking at what’s wrong, the first troubleshooting step I recommend actually has to do with the charger. It’s just as likely to be the cause.

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Only one of the cells inside your battery is problematic. That’s why it’s still working, but not holding a charge properly or getting to full bars. There’s a way to confirm this.

You can try to “reset” an old battery in order to make it charge normally again. I have a video which shows how you can do this and you can watch it below.

After you have the cells exposed, you’ll need a multimeter. With something that can help you measure the voltage accurately, see if any of them are weaker than the others.

Milwaukee M12 batteries are made to last a long time, both in terms of battery life and lifespan. However, as with any other battery, they eventually have some complications pop up.

It’s very important to know the meaning of the different lights on a Milwaukee M12 battery so I have a short video about this topic. You can watch it below.

Amongst these complications, a really common one is the Milwaukee M12 battery not holding charge, or getting to full bars. This is different from your Milwaukee M12 battery showing green but not charging to full.

The charger may be faulty, not providing enough power to the battery. That’s stopping it from charging fully and getting to full bars. So, ensure that that’s what’s up by trying a different one.

On the other hand, if you’ve been using this battery for a while, I doubt manufacturing has anything to do with it. It’s likely something else that happened, so let’s see what that might be.

Get a suitable replacement cell for the pack if you find any that have bad voltage. That’s what’s stopping your Milwaukee M12 battery from holding charge and getting to full bars.

This is a super commonly reported problem, and there’s a good reason for it too. Some Milwaukee batteries have a known manufacturing defect that stops them from holding charge properly.

To fix this issue, you would need to use another healthy battery with the same specs as the faulty battery. Using a wire, connect the positive and negative terminals of the 2 batteries.

Hi, I am Thomas Martinez, the owner of ToolCroze.com! As a passionate DIY enthusiast and a firm believer in the power of quality tools, I created this platform to share my knowledge and experiences with fellow craftsmen and handywomen alike.

If it shows a solid red it means the battery is charging normally and this will turn into a solid green when it becomes fully charged.

For that, open the covering of your Milwaukee M12 battery. With the covering open, you’ll see a pack of cells held together inside. Take these out, as I have in the image below.

Your Milwaukee M12 battery may not be charging to full bars because it no longer can. This can happen when the individual cells inside start to lose balance in their voltage.

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You need to open the battery and check the individual cells using a multimeter. Each battery cell should have an output, and if not, it’s identified as a bad battery cell.

A new battery may be costly, but it’s a necessary expense when your current one is too old. On the bright side, as I mentioned at the start, Milwaukee batteries are made to last a long time.

Usually, the charger will display a flashing red and green light if the battery isn’t charging. This means it has detected a bad battery.