Powering ESP-01S from battery?

Using Arduino General Electronics
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Hello all. I have an ESP-01S device that I'm trying to make as compact as possible. It has no sensors or motors connected to it; it's just a WiFi device. I'm trying to find a very compact battery power supply for it, or possibly design my own PCB. Does anybody have any suggestions? The battery doesn't have to keep it going for a super long time, only a few hours. Keeping it small is more important than battery life.

Does anybody have any suggestions for this, or how I could possibly design my own PCB?

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@tsel1209
The cheapest easiest way is to use a 3.7V Li-ion battery and a low dropout 3.3V linear regulator

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Something like this:

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Note that some boards have built-in battery chargers...

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Keep in mind that an ESP8266 is fairly power hungry, calculate about 100mA as a baseline average. Not using WiFi would probably make it less so, but then i figure that WiFi is most likely the reason to use an ESP.

LiPo is the smallest and lightest battery, but they deliver a variable voltage. A buck converter is the most efficient, but usually a bit more bulky with the use of external components than a lineair regulator.
If it is possible in the scheme of things to use deepsleep, then another ESP board like a Wemos D1 mini may be more practical. The Esp-01 does not have the pin exposed that is required for wakeup.

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Compact is quite relative. Can you give some size constraints?

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I'm just trying to make a really tiny ESP device, so the smaller the better.

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CR2450 Lithium Coin cell. Might last an hour.
24mm round, 5mm thick

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Would that cope with the Tx peaks? :thinking:

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Apart from that, remember that all radio transmitters tend to have high peak currents - significantly above the average...

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Would that cope with the Tx peaks?

No it would not so forget about using it

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