The CA033T (also known as the CA-033-T) is a compact single-cell lithium-ion and lithium-polymer battery charging and protection module built around the TP4056 charging IC.
Key Specifications & Features
- Charging IC: TP4056
- Input Interface: USB Type-C (some variants also exist with Micro-USB)
- Input Voltage Range: 4.5V – 5.5V DC (standard 5V USB power)
- Full Charge Voltage: 4.2V
- Default Charging Current: 1A (adjustable via onboard resistor)
- Module Dimensions: ~2.8 x 1.7 x 0.3 cm
- Indicator LEDs:
- Red LED: Charging in progress
- Green / Blue LED: Fully charged
Built-in Protection Features
- Overcharge protection (cuts off at ~4.2V)
- Over-discharge protection (cuts off load if cell voltage drops too low, e.g., ~2.5V)
- Overcurrent and short-circuit protection
Common Applications
- DIY power banks and 18650 cell projects
- Rechargeable flashlights and emergency lights
- Arduino, ESP8266, or ESP32 portable power management
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