I need to power an Arduino Nano, an IMU, barometer, and SD card reader, for a model rocket flight altimeter. What's a light way (ideally sub 25 grams), that I can power this setup for at least 2 hours? I looked at coin batteries, but they are under 5 volts needed, and I'm not sure if 6Vs of 2 coin batteries in series would be too much(but, I don't think any good holders exist, plus the rocket would experience around 50gs, so I don't think taping coin batteries together would be a good idea).
I have a one cell lipo battery(3.3v) that is only 150mah, and I couple probably use a couple in series, but I can't find any light 5v regulators on aliexpress, any cheap models you recommend?
Edit: Would a logic level converter like this one work? https://www.sparkfun.com/products/12009
You need to do a bit of work before you can decide what battery chemistry you want to use and if it is even possible to do what you want. I am going to assume the nano will work at 40 mA but you need to verify that. It also depends on what it is driving with the I/O pins. A buck regulator will give you a lot more battery life, a linear one is about 50% the Buck 90%+. Generate a schematic, it will help a lot and show all of your connections. With out links to data on each of your hardware items it is almost impossible to answer your question.
You could go for a bare bones 328 processor that you could put to sleep for a few seconds, wake take measure my then sleep . That can dramatically reduce current drain ( maybe 10 fold ) .
Get the processor to turn whatever sensors it can off between times .
Get that working then decide on the battery. If you can, run the processor and sensors at 8Mhz to allow it to run off a lower voltage - eg single cell lipo
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