Replacing 3 AAA batteries with Li-Ion batteries from used e-cigarettes

TEM ID: BLM-PWR-AAA20500 
CLASS: Energy Transmutation Device 
GENERATION: Post-Steam Revival Mk.I 
MAKER: Black-Lotos9758

Energy Artifact: “AAA→20500 Converter” 

⚙ PURPOSE 
Energy rebirth. 
The artifact allows you to use an analogue of 20500 lithium-ion cells instead of three AAA batteries, with which the devices lived. 

Application: 
lamps, table light sources; 
autonomous mills, sensor nodes, radio stations; 
DIY mechanisms and technomages' projects. 

🧩 CONSTRUCTION 
Housing: parametric 3D model (PLA / PETG). 
Shape: cylinder according to the dimensions of Li-ion 20500. 
Slots: provide fixation. 
Contacts: Nickel tape thickness - 0.12, width - 8mm. 
Decor: none, except for the definition of +marking/-. 
BMS: built into the middle. 

⚡ ENERGY PARAMETERS 
Type: analogue of Li-ion 20500 (3.6–4.2 V) 
Capacity: from 550 mAh and above depending on the element(s) 
Charge: standard CC-CV mode (4.2 V) 

🧙 COMMANDMENTS 
“The device will work as long as you can give current.” 
— an entry from the notebook @Black-Lotos9758 

📂 Availability The laws of the Great Corporation (license restrictions) prohibit the distribution of the alchemical formula .f3d. However, the printed artifact in .stl format is freely available to every traveler who owns a 3D forge.

Material: PLA / PETG
Layer height: 0.2 mm
Infill: 40–50%
Supports: Required
Orientation: Print bottom side down

📩 Contact: [email protected]
📥 Documentation, firmware, files — on the channel.

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📺 YouTube: [https://www.youtube.com/@artifact-forge]

🔗 Telegram channels:
⚙ 3D modeling, CNC: [@bl_3d_mgmt]
🔌 Projects, microcontrollers: [@bl_projects]