172Views4Replies

Author Options:

How can I use a 9volt charger on a 3.6 battery 700 mA? Answered

So Im doing this project where I have a 9 volt charger and I need to charge a 3.6 volt 700 ma battery. How would i go about charging this battery? I tried to use one resistor but it got extremely hot, hot enough to melt plastic. 

Comments

The forums are retiring in 2021 and are now closed for new topics and comments.
0
steveastrouk
steveastrouk

8 years ago

That's a lithium battery. Build a lithium battery charger, and be careful. You may have been lucky not to explode the battery.

Steve

0
jnajmy
jnajmy

Answer 8 years ago

What size regulator would I need to use to bring the voltage down from 9 volts to 3.6 volts at 600 mA?
This is the battery I want to use:
http://www.amazon.com/gp/product/B003LMOVQS/ref=ox_sc_sfl_image_7?ie=UTF8&psc=1&smid=A2220UWPX1VUDX

Can I use this to charge the battery?:
http://www.amazon.com/gp/product/B0030862XI/ref=ox_sc_sfl_image_4?ie=UTF8&psc=1&smid=AM0TJKCE8MD21

If not can anyone help me figure out whats the best way to charge that battery?

thanks for the help!!

0
mpilchfamily
mpilchfamily

8 years ago

It;s best that you don't try to use that charger on any battery other than what it was designed to charge. Find the correct charger and use that.

BTW, a resistor alone isn't going to bring the voltage down. A resistor will restrict current flow. You need to use a voltage regulator in order to bring voltage down. Yes a pair of resistors set up as a voltage divider will reduce both voltage and current but it's best to use a regulator.

0
steveastrouk
steveastrouk

Answer 8 years ago

V=IR, of course it will bring the voltage down. That said, a regulator at the very very minimum is needed here.