![]() ![]() If you want to double check yourself to make sure that you have correctly identified the terminals, you can carefully remove the cover of the battery pack and check to see where each wire is connected. Once you have identified the thermal fuse, any remaining pin will be the temperature sensor. The thermal fuse also connects to the positive output of the charger. So if you measure its voltage with a multimeter it will have the same voltage as the positive terminal of the battery (or slightly less). Any additional terminals will probably be a thermal fuse or a temperature sensor.Ī thermal fuse is usually connected to the positive terminal of the battery. You can then use a multimeter to measure the voltage of the corresponding terminals on the battery to determine which one is positive and which one is negative. A power tool will usually connect directly to the positive and negative terminals of the battery. Start by noting the position of the terminals on the power tool. If the battery has more than two terminals, then there are several things that you need to check. If your battery has two terminals then you can easily use a multimeter to identify which one is positive and which one is negative. The first thing that you need to do is identify and label each of the terminals on the battery. ![]() This will sacrifice some efficiency but it will guarantee that you will not destroy the battery. The safest way to charge a battery is to do it slowly. If you want to use a DIY charger to charge the battery, your primary concern should be safety. This lets the charger automatically adjust the current to maximize the charge rate without overheating the batteries. The temperature sensor allows the charger to actively monitor the temperature of the batteries while they are charging. If the temperature of the batteries ever goes above the maximum safety threshold, the thermal fuse will disconnect the battery from the charger. The charger connects to the battery through the thermal fuse. To accommodate these sensors, the battery has two additional terminals (a total of four). For example a Craftsman 19.2V battery has a thermal fuse and an internal temperature sensor. In more advanced models, the battery pack may have a number of internal sensors. The charger then applies a small direct current and slowly charges the battery pack over several hours. ![]() In the most basic models, the charger will connect directly to the end terminals of the battery pack at two exposed pins. Most cordless tool battery packs are made up of several smaller batteries that are all wired together in series. There are many different styles of cordless power tool batteries and many different styles of chargers. ![]()
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