HELP please!! with Li Ion battery

1 st question:
i have a 7.4v 2200mA li ion battery. my ip camera takes 5v 2amps
what color resistor should i use and how many ohms?

2nd quesiton:
i have a class 2 battery charger 12 volts 300mA is it good to charge my 7.4v li ion battery?

iceng5 years ago
Just because the camera sometimes uses 5V 2A max or some times 100 ma.
You cannot pick a single resistor to reduce the voltage from the 7.4V supply..
At 2A the resistor needs to be 1.2 ohms,
at 100ma the resistor needs to be 24 ohms.
you need a 5V regulator like an 7405 or an LM317.

NO, unless you put a resistor in series and watch the temp continuously.

A
dwstar79 (author)  iceng5 years ago
That makes so much sense. I went and ordered the 7405 from digi key. And will use it and soon as it comes in.
Thank you so much for your help. :)))
iceng dwstar795 years ago
Hope you ordered more then one, I usually hook it up wrong the first time ;-)