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2S 20A 18650 lithium battery protection board (BMS)
2S 20A 18650 lithium battery protection board (BMS)—overcharge, over-discharge, and overcurrent protection for 2-cell Li-ion packs.
The 2S 20A 18650 Lithium Battery Protection Board (BMS) is a compact and reliable solution designed to protect 2-cell (2S) 18650 Li-ion battery packs from overcharge, over-discharge, and overcurrent conditions. Rated for 20A continuous current, it ensures safe operation and longevity of your battery packs in DIY and portable electronics projects.
This BMS provides balanced charging protection, preventing cell damage and maintaining uniform voltage across both 18650 cells. It is ideal for DIY power banks, electric scooters, battery packs for Arduino/ESP32 projects, portable devices, and small EV applications.
With short-circuit protection, overcurrent protection, and thermal safeguards, this 2S 20A BMS ensures the safety and efficiency of your lithium battery systems while maintaining compact size for easy integration.

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Text to Speech TTL Module (Serial to Speech)
-  Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Â Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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 Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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 Voice effect optimization
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 Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes
WH0201102 ABS 1.75 mm 1 kg Filament-Wanhao
- Material: ABS
- Color: White
- Material Diameter: 1.75mm
- Printing Temperature: 220° to 230°C
- Roundness Accuracy: +/- 0.5mm +/- 0.5mm
- Density: 1.31g/cm3 1.01g/cm3
- Mounted: Spool Mounted
- Net weight: 1kg
- Packaging Vacuum-sealed with desiccant to protect the filament from humidity
- Highly Detailed & Quality Outputs.
- Tried and Tested by Makenica.com
- Compatible with any FDM 3D Printer.
- ABS is stronger than PLA
- Easy to post-process.
- Environment friendly – ISO 9001 and ROHS certified

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