Given a simple circuit of a draw around 28mA (when supplied 3.3v). I'm trying to maximize run time on a battery, but working with what I've got on hand... I have the following batteries:
- 5000mAh 3S LiPO (12.6V fully charged)
- 1700mAh 2S LiFE (7.2V)
- 600mAh 1S LiPO (4.2V)
I have the following regulators:
- MCP1700 3.3V LDO
- LM2931 5.0V LDO
The MCP1700 Can't handle the larger batteries. So I see my options are:
- Use the tiny 1S and the MCP1700
- Use the 3S and the LM2931 output into the MCP1700
- As above but with the 2S
Which should last longer?
Obviously the 5000mAh battery is by far the largest, but that's a pretty inefficient setup. The 2S is somewhat more efficient and still about 3x the size of the 1S. The 1S should be by far the most efficient, but the battery is tiny.
I can, of course, just try each and measure. Thought I'd ask here for insights.