UPS (continuously charging) with Li-Ion 18650B and Battery Charger Board. Adjustable Output Voltage. Easy change cover by use case (led tree, ups for rpi, powerbank, ...).

INPUT: 4.5 V - 8 V DC
OUTPUT: 4.3 V - 27 V DC (adjustable)
MAX CHARGING: 1 A
MAX DISCHARGING: 2 A

SWITCH ON = charging on + output on
SWITCH CHARGE = charging on + output off
SWITCH OFF = charging off + output off (Charger Board disconnected)

Red light = Charging
Green light = Fully Charged

PCB (possible download from here for other project)

[https://www.fstimer.cz/wiki/doku.php?id=optobrany_-_mala_casomira#plosny_spoj_opt_20](https://www.fstimer.cz/wiki/doku.php?id=optobrany_-_mala_casomira#plosny_spoj_opt_20)

[https://www.fstimer.cz/wiki/doku.php?id=optobrany_-_mala_casomira#plosny_spoj_opt_10](https://www.fstimer.cz/wiki/doku.php?id=optobrany_-_mala_casomira#plosny_spoj_opt_10)

Battery Holder for Li-on 18650B with Protection Board

[https://www.prusaprinters.org/cs/prints/31379-battery-holder-for-li-on-18650b-with-protection-bo](https://www.prusaprinters.org/cs/prints/31379-battery-holder-for-li-on-18650b-with-protection-bo)

Micro USB PCB Female

[https://www.aliexpress.com/item/32779407561.html](https://www.aliexpress.com/item/32779407561.html)

Li-Ion 18650 Battery Charger Board DC-DC Step Up Boost Module

[https://www.aliexpress.com/item/32908819094.html](https://www.aliexpress.com/item/32908819094.html)

Li-Ion 18650 Battery Protection Board

[https://www.aliexpress.com/item/32893531368.html](https://www.aliexpress.com/item/32893531368.html)

Li-Ion 18650 Battery Holder

[https://www.aliexpress.com/item/32816694931.html](https://www.aliexpress.com/item/32816694931.html)

Li-Ion 18650 Battery (verified capacity)

[https://www.aliexpress.com/item/32324914059.html](https://www.aliexpress.com/item/32324914059.html)

Toggle Switch 8 Pins 3 files 2P3T DP3T

[https://www.aliexpress.com/item/32799686188.html](https://www.aliexpress.com/item/32799686188.html)

Banana Panel Socket Connector

[https://www.aliexpress.com/item/32785322923.html](https://www.aliexpress.com/item/32785322923.html)

Banana Plug Connector

[https://www.aliexpress.com/item/32758916948.html](https://www.aliexpress.com/item/32758916948.html)

Inserts Brass (M2x5x3.5mm)

[https://www.aliexpress.com/item/32842866575.html](https://www.aliexpress.com/item/32842866575.html)

Screws Flat Head (M2x5mm)

[https://www.aliexpress.com/item/32871056705.html](https://www.aliexpress.com/item/32871056705.html)

Hex Nut M2

[https://www.aliexpress.com/item/32585008102.html](https://www.aliexpress.com/item/32585008102.html)

USB-A Female

[https://www.aliexpress.com/item/33047977518.html](https://www.aliexpress.com/item/33047977518.html)

Print instructions

Box and Cover = Black PET-G
Charging Hole Col = Transparent PET-G