Last edited: 3.1.2024
I have made a portable lamp out of a normal 230V lamp.
I bought the lamp at Aldi I think.
Then removed the 230V cable and installed a LED pcb, a Lion battery and a charge and driver board.

The battery is from an old PC so I do not know the capacity. It are 18650 cells and I use 3 cells in parallel, so the nominal voltage is 3.7 V (3.0 – 4.2 V).

The old hole for the 230V cord is now the hole for the micro USB charging plug.

For charging the battery and LED lamp driving I use a cheap China board found on eBay. It has a micro USB charging (5V to 3.7 V) and a step up regulator (3.7 V to 12 V) on one board.
On eBay search for “USB 18650 Battery Charger Module Boost Step Up”.
It cost only .

UPDATE (3.1.2024): Do NOT use this board. It does not have a under voltage cut out (< 3.0 V), so I got the batteries deep discharged and now the are no good any more.
Wait for at update with a new charger and step up converter boards !

The used light source is a 12 V DC, G4, 2,1 W, 203 lumen, which I bought at jemogfix. I removed the connector and connected it directly after the diode bridge to save same voltage losses.
The consumption is 0,3 A DC at 12 V, so it is 3,6 W.