Battery Monitors

THREE VOLT LOW BATTERY VOLTAGE FLASHER This circuit is designed to monitor two alkaline cells (3v) that form the battery often used in portable electronic equipment. It use an inexpensive IC from Panasonic that is connected to an efficient LED flashing circuit. When the battery voltage drops below a certain point the circuit flashes the LED. In the off state the circuit draws only 1uA, while in the active flashing state it draws 20uA. Published in EDN, Jan 2, 1997

12 Volt Lead Acid Battery Monitor: This simple circuit makes it possible to monitor the charging process to a higher level.

12B Battery Condition Indicator

Battery condition indicator12v

Battery Monitor in MultipleCell Applications: Maxim APP 405: May 04, 2001 / The DS2760 and DS2761 battery monitor and protector are battery management ICs geared mainly for single-cell Li-Ion battery pack applications. Although designed mainly for use in the single cell applications, these devices can be used in multiple-cell applications. This application note demonstrates to the user how to use the DS2760 or DS2761 in a multiple-cell application including necessary circuit modifications and limitations in functionality of the devices in the multiple-cell environment. An example circuit is shown along with recommended device configuration of the DS2760 or DS2761 battery monitors.

Circuit Prevents Deep Discharge of Batteries: EDN Design Ideas to avoid the deep discharge that can destroy or shorten the life of a rechargeable Battery, you must disconnect its Load before the discharge is complete

Circuit Protects Battery From Over discharge: PDF contains multiple circuits - scroll to find the one of interest / In some applications, it is undesirable to Over discharge the battery, because it could irreversibly reduce the battery's capacity and the number of discharge/charge cycles. This circuit protects a single NiMH (nickel-metal-hydride) cell by disconnecting the load from the battery when it gets discharged enough.

LED Flasher indicates Low Battery Condition

Low battery indicator uses flea power It is always desirable to use a low-battery indicator that consumes as little power as possible. For a 9V, 450-mAhr alkaline battery, a 50-µA low-battery indicator can by itself run the battery down in a little more than a year. Battery-powered devices that need to run continuously for a long time require battery indicators that consume minimal power....

Low Battery Voltage Cutoff Consumes just 1 MA

MicroAmps Monitor Dual Supply Batteries: Low Power Circuit monitors two 9V Batteries in a dual Supply configuration and turns on the Battery Low LED if either Battery Voltage drops below its limit

Overload & Reverse Current Circuitry Protects Battery & Load There are numerous Circuits can protect against backward installation of Batteries and other Over current causing conditions

Phantom Power Battery Test Circuit: LED will light when battery is over42 volts

Simple Circuit Disconnects Load From Battery

Simple Circuit Monitors Battery Voltage

Simple Circuit Safely Deep discharges NiCd Battery: PDF contains multiple circuits - scroll to find this circuit

Solar Car Battery Monitor Schematic

Voltage Monitor Prevents Deep Discharge of Battery