Battery extender for Ikea GODAFTON led candle

This is to replace CR2032 default battery with an 18650 lithium battery.
On the bottom side there is room for a charge controller like this:

https://www.ebay.it/itm/10PCS-5V-Micro-USB-1A-18650-Lithium-Battery-Charging-Board-Charger-Module-/201039030988?hash=item2ecedc2acc