Yet, it will take you an average of 8 hours to charge a dead 9V rechargeable battery to its full capacity.ĩV rechargeable batteries are available in different chemistries. It depends on the charger, the battery chemistry, and the battery brand. How Long Does It Take to Recharge a 9 Volt Battery? A simple resistor R will be adequate to design a crude current source from your 12V source.įor this to happen you need to interpose 75 ohms and place a 1/4 watt resistor between your 12V source and your 9V battery.” Réal Morrissette, Electronic Engineer Research & Development at Intelligent Technologies “Assuming your battery capacity is 500mA/h, you need a current of 50mA to recharge it. To recharge it safely, you need to figure out the capacity of your battery in Ampere/hour C. The battery consists of seven 1.2V cells and has a nominal voltage of 8.4V. Next, this is how you charge a 9V NiMH battery with a 12V charger. It will automatically stop the charging once each cell voltage reaches 4.2V and the battery is full. The rest is down to the Battery Management System (BMS) inside the 9V li-ion battery. To regulate your 12V source to 8.4V you’ll need a variable voltage regulator (such as the LM317T). To safely recharge it you need a voltage source of 8.4V. The 9V li-ion battery is made of two 3.6V cells lending it a nominal voltage of 8.4. Similarly, you can charge a 9V battery with a 12V charger, and we show it in more detail below with Lithium-ion and NiMH batteries. There are ways to do it even with a 5V charger, however, you’ll be able to charge it only up to 5 volts. Now, below is a breakdown of how to safely recharge a 9V battery with 8.4 nominal voltage.
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