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20A 3.7V 18650 Li-ion Battery Protection Board (BMS)
20A 3.7V 18650 Li-ion battery protection board (BMS)—overcharge, over-discharge, and overcurrent protection for single-cell Li-ion packs.
The 20A 3.7V 18650 Li-ion Battery Protection Board (BMS) is designed to safeguard single-cell 18650 Li-ion battery packs from overcharge, over-discharge, and overcurrent conditions. With a 20A continuous current rating, it ensures safe operation and extends battery lifespan for DIY and portable electronics projects.
This BMS features short-circuit protection, thermal protection, and balanced charging, maintaining stable and safe voltage levels for your battery. It is ideal for portable devices, DIY power banks, small electric vehicles, Arduino/ESP32 battery projects, and other battery-powered electronics.
Compact and easy to integrate, this 20A 3.7V BMS provides reliable protection for single-cell Li-ion systems while ensuring high efficiency and safety.

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-  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

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