This is a base with battery, touch sensor, battery charger, and LED light for the Moon Lamp. It is designed to fit an 18650 Li ion battery, but it can be customised to any other size.

Parts used:

• 0.5W LED https://www.ebay.com/itm/10PCS-8MM-Straw-Hat-0-5W-LED-Light-Emitting-Diode-White-LED-High-Power-NEW/253677201181
• Touch sensor (The LED diode located on the sensor needs to be removed in order to make this work, otherwise it steals all the energy required for the transistor and therefore also for the main LED; the B jumper needs to be soldered) https://www.ebay.com/itm/10Pcs-TTP223-Touch-Key-Module-Capacitive-Settable-Self-lock-No-lock-Switch-Board/352537840349
• 10 Ohm resistor (other value can be used as well, I picked what I had at home. Higher value means higher light up time but lower light intensity and vice versa. Too low value can cause LED damage. Use value higher than 6.8 Ohm. Recommended range is 6.8 - 30 Ohm) https://www.ebay.com/itm/100PCS-1-4W-0-25W-1-Metal-Film-Resistor-1-4-Watt-Resistor-0-10M-Ohm-New/352646283713
• 18650 Li ion battery (I used a battery from old laptop) https://www.ebay.com/itm/SAMSUNG-ICR18650-26JM-RECHARGEABLE-BATTERY-3-6V-2600mAh-Li-Ion-NEW/254558040973
• Li ion battery charger module (I used what I had at home but I am not able to find the same product online now) https://www.ebay.com/itm/DD08CRMB-mini-DC-5V-1A-3-7V-4-2V-li-ion-Battery-Charger-Board-Module-18650-Solar/272241670757
• Charging connector https://www.ebay.com/itm/10x-DC-outlet-Power-Supply-Jack-Socket-Female-PCB-Mount-Connector-5-5-x-2-1mm/183115518555
• NPN transistor (PNP can be used too, but the schematics need to be updated appropriately ) https://www.ebay.com/itm/100pcs-New-NPN-Transistor-2N2222A-2N2222-TO-92/281307921085
• Charging cable https://www.ebay.com/itm/USB-A-Male-to-2-0-2-5-3-5-4-0-5-5mm-Connector-5V-DC-Charger-Power-Cable-Cord-Sw/273838664205
• Optionally a battery protection (I didn't use it but you may add one to increase safety) circuit https://www.ebay.com/itm/1S-5A-3-7V-18650-BMS-Li-ion-lithium-Lipo-Battery-Circuit-PCB-Protection-Board-BR/184201220024

Please, build your own circuit only if you know what you are doing. I do not take any responsibility or liability for injuries, or damages, etc. caused by following the steps below. The project uses lithium battery which can cause fire if handled improperly.

Circuit info:

• Connect the power charger connector to the li ion charger board
• Connect the LED anode (+) to the resistor
• Connect the NPN transistor to the touch sensor (connect the base to the output of the touch sensor)
• Remove (or break) the LED located on the touch sensor board
• Solder the B jumper of the touch sensor board
• Connect the NPN transistor to the LED (connect the collector pin to the LED cathode (-) pin)
• Connect the battery Gnd (-) to:
  • the charger module B (-) or Gnd pin
  • the Touch sensor Gnd pin
  • the NPN transistor emitter pin
• Connect the battery Vcc (+) to:
  • the charger module B (+) pin
  • the Touch sensor Vcc pin
  • the resistor

Note: The LED diode located on the touch sensor needs to be removed in order to make this work; the B jumper on the touch sensor needs to be soldered