Does the electron have to be powered with a lipo

Can the particle electron be powered with an 18650 battery? Or does it have to be a lipo?

Same chemistry, just different construction.
Some cylindrical cells don’t have protection circuits built into them (some do).

So yes? Ok thanks!

Yes, I’d suggest use a quality Protected 18650 cell.

Would i be able to use a lipo AND an 18650 to power the particle electron? to extend battery life?

Try just use a higher capacity single cell battery with a protection pcb attached to keep things simple and to prevent cell miss match issues.

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You can power it with any battery you wish. However, if you are simply plugging into the battery port with another battery then make sure it is a 3.7v. I have had great success using this: https://www.adafruit.com/product/353 which +/- connector matches with the electrons. And the pmic seems fairly accurate still.

You can also power the electron with a 12v battery by using the VIN pin, however, you will need another way to guess battery health.