1

I am considering obtaining a pair (2) 3.2V AA Lithium Phosphate batteries rated at 600mAh for a project that needs to operate at 3.7v/1.8ohm at peak times and next to nothing the rest. Obviously the mAh significantly impacts on the usage time but would running two 600mAh batteries give me a similar usage time as a single 1200mAh might?

In other words does twice as many cells give me twice the mAh?

Matthew Brown aka Lord Matt
  • 311
  • 2
  • 8
  • 15
  • 1
    Is your plan to run the two 3.2V batteries in series to get a 6.4V battery, then use some sort of DC-DC converter to reach 3.7V? If that is the plan, then the calculation is more complex. – gbulmer Sep 09 '14 at 10:20
  • To be honest I had not entirely thought about that yet. I was thinking that a variable voltage regulator might be a good idea. I have also started to think that parallel connection and some sort of capacitor so I can get 25 seconds of 3.7v out of the 3.2v might give me better life expectancy between charges. I am really not all that sure. – Matthew Brown aka Lord Matt Sep 09 '14 at 16:14

1 Answers1

3

If connected in parallel, two 3.2V 600mAh cells will give you a 3.2V 1200mAh battery. If connected in series, you will end up with a 6.4V 600mAh battery.

Enemy Of the State Machine
  • 1,765
  • 11
  • 10