Review on 🔋 Milwaukee Genuine OEM M12 Lithium Ion 12V Battery Charger w/LED Indicator, Red - Model 48-59-2401 by Kyle Whitehead

This is a technology and product safety situation that depends on how the designers have implemented the features. I don't know what the solution could be; That depends on the battery developers. The charger works fine (see below), but it also doesn't charge the 2500mAh 12V battery to replace the Milwaukee M12 battery. Based on the design I would say that both batteries are from the same OEM. Both were bought by Revain last month. The reason appears to be the charger's safety feature, which prevents attempts to charge a defective battery. More on that later. Nothing happens when connected to the charger: the indicators do not light up or flash. With other devices that I use for my electronics hobby, these batteries have been discharged and recharged many times. To prepare them for the maximum load. I am using a ZB2L3 discharge controller and a Li-Ion/Li-Po battery charger. They were also used in the Milwaukee M12 drill and work well. So I'm sure they're good. But they don't charge in the same type of charger that comes with the drill my mother-in-law has. The standalone charger I have doesn't charge dead batteries either. If the Milwaukee charging circuits don't see an acceptable voltage level, nothing happens. To do this, the sensor uses the LED supply voltage from 3 terminals. If this voltage drawn from the battery cells is not within the required limits, charging will not occur. Apparently the above batteries have 3 poles different from the batteries being loaded. DO NOT DO THIS AT HOME How do I know all this? Inserting a thin plastic strip covering 3 poles will charge a partially discharged battery normally. I can only measure voltage at 3 terminals. This seems fine compared to what it takes to light up the LEDs. But. How to know in advance? UPDATE: February 22, 2020 I found the cause of my charging problem. My standalone charger only charges to about 14.2V. The Milwaukee charger only charges to about 12.6V or triple the 3S 18650 4.2V rating to fully charge the cell. Attempting to charge a battery with more than 12.6 volts at the terminals should appear as the Milwaukee charger failing and shutting down to avoid damage. Voltage no higher than 12.6 for 3S 2.5A and 2x3S 6A batteries.