ESP8266 Community Forum

Hi! I need a small power supply for my project. It's not some sensor to be on 24/7, but the kind of device to be used for 1-3 hours at most. I tried connecting 2 AAA batteries to produce 3 volts. It worked well with ESP-01, but for ESP-07 it wasn't enough. What possible solutions are there?
I thought it would be cool to use some kind of rechargeable battery like the ones in mobile phones. But I don't know if there are any to produce 3.3 volts. Other options: connect 4 AAAs to produce 6V and then use a voltage divider to lower it down to 3.3, or connect them 2 blocks of 2 AAA batteries parallelly. But I still don't know what to choose. What are your thoughts? Ebay links highly appreciated, thanks

Hi Alex, lots of options but realy need more detail as to what your intened application. 1 to 3 hours of WiFi @ 250mA is very different to 1 to 3 hours monitoring something @ 20mA, then sending the collected data in a single 20 second WiFi burst @ 250mA.

A possible solution, based on a : 18650 Li-Ion rechargeable Cell + charging / monitoring circuit

I think you should try again with the AAA cells. There shouldn't be any difference between the power consumption of an ESP-01 and an ESP-07 so its odd that your ESP-07 didn't work.

I've run ESP-07s and ESP-12s off AAA's fine, and using two AA and AAA batteries seems about the easiest and cheapest power supply choice. Just to confirm here's one running off a couple of AAA's right now, just publishing the battery voltage once a minute and light sleep kicking in for the rest of the time. Looks like that might last about 6 hours...