In-Situ Battery Test Probe
This item describes a simple probe that allows in-situ AA and AAA battery voltage and current drain measurements without removing the cells from the holder. In use, the probe is simply pushed between...
View ArticleImproved Vibrating Battery Tester
Many blind and deaf-blind people use portable electronic devices to assist their everyday lives but it is difficult for them to test the batteries used in that equipment. Talking voltmeters are...
View ArticleHigh-Current Battery Discharger
If you have a motley collection of 12V batteries in varying states of health, this simple circuit will allow you to easily check their capacity. It’s basically a high-current discharge load which is...
View ArticleCar Battery Failure Detector
A car battery deteriorates in use and its life seldom exceeds four years. When new, its voltage may drop to only 2V while cranking the engine. As the battery ages, its internal impedance increases and...
View ArticleBattery Tester For Deaf and Blind Persons
Many blind and deaf-blind persons use portable electronic devices to assist their everyday lives but it is difficult for them to test the batteries used in this equipment. Talking voltmeters are...
View ArticleBattery Desulphation Progress Monitor
A number of readers have asked how to tell when the Lead-Acid Battery Zapper has done its job and battery desulphation is complete. In the author’s experience, batteries that are going to respond to...
View ArticleFlat Battery Indicator
This small circuit was developed to monitor the battery in a model hovercraft. The lift in the model is produced by an electric motor driving a fan. To avoid the possibility of discharging the...
View ArticleLow Battery Indicator II
This circuit indicates the remaining battery life bAy varying the duty cycle and flash rate of an LED as the battery voltage decreases. In fact, the circuit actually indicates five battery conditions:...
View ArticleBattery Charger Display Using LT1639
The Over-the-Top type of operational amplifier is ideal for use as a current sense for battery charger applications. The design described here can be used with chargers for rechargeable batteries...
View ArticleHyper-Simple Battery Capacity Tester
The circuit described here is eminently suitable to indicate the capacity of a battery. We use a cheap electric clock for this. By connecting a resistor across the battery terminals, the battery is...
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