Lithium Ion Battery

Thread Starter

sharath_412

Joined May 7, 2007
32
Hi,
Hw much time does it take to charge a Lithium ion batter (3.7 V and 900 mAH). The adaptor used is 5 Volts 500 mA. Is there any equation which tells about this.

thanks & regards
sharath
 

scubasteve_911

Joined Dec 27, 2007
1,203
Hi,
Hw much time does it take to charge a Lithium ion batter (3.7 V and 900 mAH). The adaptor used is 5 Volts 500 mA. Is there any equation which tells about this.

thanks & regards
sharath
Hi,

That's a fairly loaded question, ultimately it depends on your battery. Some are designed to handle higher rates of charge, whilst others cannot handle it.

Most Lithium Ion batteries can handle a 1C rate of charge, which means that it can be charged at its capacity. In your case, 900mA. But, this cannot be reliably used to charge your battery. Lithium charging is a lot more difficult than other battery types. Usually, charging is broken down into a 'charge profile'. This means there is a precharge, fast-charge, and a slower charge cycle depending on feedback from the battery. Most chargers include basic temperature sensing, since it is dangerous to overheat the battery.

It's pretty safe to say that your battery will take about 2-3hours to charge.

Steve
 
Top