You can use a variable resistor to fine tune the low voltage indication, and/or use a set resistor when you have a good value figured out. No memory and low self-discharge means this battery is ready when you are. Each pack is equipped with a LED state of charge indicator for immediate battery charge feedback. When the battery becomes discharged, the zener stops conducting and the base bias goes low, and BC557 begins conducting, and the LED alerts you to the low battery voltage. V60 2.5Ah Lithium Ion Battery pack is compatible with all CRAFTSMAN® V60 cordless outdoor tools and ideal for handheld products. As long as the battery voltage stays above 11.6V, the zener keeps the base of the BC557 transistor high. The BC557 transistors’ base is biased by the 10V zener diode. The BC557 PNP transistor controls the lighting of the LED. Only a few parts are needed in the small but useful circuit. When the LED turns on, you’ know it is time to charge the battery to prevent the battery from dying on the shelf. This circuit will light an LED when the battery voltage decreases to 11.6V. If that is the case, you can use this as the threshold voltage and simply scale down the battery voltage accordingly. ![]() ![]() ![]() When stored, batteries will self discharge, and if left for too long, will self-discharge to a damaging level. 2 Answers Sorted by: 2 A regulator is a good, simple idea especially if you already have a regulated voltage (buck converter or similar) present. Many that have golf carts, small EV’s, RV’s, or solar power banks for homes have a number of 12V lead acid batteries to maintain and this circuit will help protect your investment while not using these batteries. The indicator translates to the estimated power left in the batteries in the device - where 100 means brand new batteries, and 0 means the batteries are. This is a simple circuit that will indicate a low voltage on a 12V lead acid battery. The full answer is, Probably not for too long.
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