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.
Banggood.com
Aliexpress.com
Ebay.com
£11.90
1 new
from £11.90
as of November 17, 2019 6:29 pm
Amazon.co.uk
$18.09
2 new
from $18.09
as of November 17, 2019 6:29 pm