Q7: Why is no one making a 110/240 VAC plug in adapter for 18V tools?Ī: The simple answer is cost, practicality and demand. They do not provide battery protection, they have no circuitry inside aside from some resistors to trick the tool into thinking it has a genuine battery connected to it, so you will most likely overdischarge the battery and kill it. Q6: Can I use adapters from eBay/Amazon to use my Milwaukee batteries on my other brand tools?Ī: 99.99% of those adapters are physical mount adapters with straight wires inside from terminal to terminal. Connecting loads directly to a Milwaukee M18 or M12 terminals without low voltage cutoff circuitry will overdischarge and ruin the battery. Makita and Ryobi keep the low voltage disconnect inside the batteries, making them great for DIY projects. However, some intelligence such as low voltage disconnect is in the tool. Q5: Is there any active electronics (BMS) inside M18 batteriesĪ: YES*. All battery intelligence is in the tools and chargers. The only component is a thermistor for overheat/low temp protection. Milwaukee M12 batteries have no BMS inside. Q4: Is there any ACTIVE electronics inside M12 batteries?Ī: NO. If the battery is a low capacity battery, such as 1.5Ah, and it's inserted dead into a bluetooth enabled tool, it is possible for the tool to overdischarge it in a few weeks. If the battery is fully charged it will take several months if not years for the tool to drain it below critical threshold. BMS draws a tiny amount of current (called quiescent current), it ranges from several microamps to several milliamps, depending on a tool. All modern power tools have a BMS - battery management system, some in the tools, some inside the battery and some have part in both places. Q3: Is it safe to leave batteries inserted into the tools for long preiods of time?Ī: That depends on many factors. Leaving batteries in freezing conditions for long periods will cause them to overdischarge below critical low voltage, and the charger would refuse to charge them. Do not leave batteries in hot cars, temperatures above 42C may cause permanent capacity loss. Store the batteries in a cool, dry place. Q1: Should I fully charge my batteries before long term storage?Ī: The recommended depth of charge is 40% (2 LED Bars on the battery gauge) for long term (> 6 months) storage. I've owned, used and repaired dozens if not hundreds of Dewalt, Makita, Bosch and Milwaukee power tools in the last 20 years. This is the information collected from my own experience as an electronics tech, tool repair man and a power tool user. NOTE: This is not an official, company-sponsored FAQ.
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