This circuit is an alternative to expensive battery chargers, the trick to lower the cost is to buy a cheap battery charger and expand it with an automatic charge breaker circuit such as the one presented here.
The heart of this automatic battery charger is the comparator which compares the NiCad battery’s voltage with a referance voltage. When the NiCad battery’s voltage exceeds a certain presettable maximum voltage level, the circuit breaks the charging via the relay and when the NiCad battery’s voltage sinks below the preset minimum level, the circuit closes the relay and the charging resumes. continue reading…

Optex Campower LI5000 is an universal battery charger, a portable model which pulls out to reveal adjustable, electrical contacts that can be maneuvered to fit various battery sizes. Optex Campower LI-5000 will be available starting from May and will cost around $89.99 and can be used worldwide, at main power supply voltages between 100V and 240V and can gain its power via AC, 12V or USB. continue reading…

This dc to dc converter raise a dc voltage at almost a double value and is useful for raising the output voltage of solar batteries up to the required level for charging acid or NiCad batteries. It can deliver up to 3Amps. The measurement values with 2A load are shown in the bottom table. continue reading…