This ESP32 comes with a battery holder at the back to provide power using a 18650 battery.
Scroll down to find the ESP32 at different stores and find the best price.
Aliexpress.com
Banggood.com
Ebay.com
£11.90
1 new
from £11.90
as of May 25, 2020 9:02 pm
Amazon.co.uk
$21.59
in stock
2 new
from $21.59
as of May 25, 2020 9:02 pm