Battery Charger Circuits

Visualize you have a phone battery, but how long does it really last on a charge? This tester circuit is like a battery fitness checker. It tells you how much power your Li-ion battery the kind in phones and laptops can hold helping you see if it is getting tired and needs replacing. This is […]

This is a special charger you can carry with you to charge your phone anywhere, even without a plug. It uses a regular AA or AAA battery just like the ones for your remote control. Inside, it has a part that takes the weak battery power and turns it into strong power for your phone. […]

This circuit is like a special watering can for NiMH batteries, the kind you find in cameras, toys and other gadgets. Regular chargers might not be perfect for these batteries, but this NiMH charger circuit is designed to give them exactly the right amount of power to keep them going strong for a long time. […]

This circuit is a speedy charger for batteries like the ones in cars and backup power systems. It can juice up your battery extra fast, but do not worry about overcharging. The circuit has a built in safety feature that automatically stops charging once the battery is full, keeping it healthy and lasting longer. So […]

This circuit shows you how to build a smart charger for car batteries lead acid batteries! Unlike a regular charger this one automatically stops charging the battery when it is full so you do not have to worry about overcharging it. This is handy for cars backup power supplies UPS, and other things that use […]