Overview
The 3.7V 90mAh Lithium-Ion Battery is an specialized power cell engineered for micro-electronics. Despite its tiny size, it delivers a stable 3.7V nominal output, making it perfect for driving low-power microcontrollers and Bluetooth chips. These batteries are most commonly used as high-quality replacements for TWS earbuds or in the development of “invisible” tech like smart rings and medical patches that monitor vitals in real-time.
Key Features
Micro Footprint: Small enough to be integrated into wearable devices without adding bulk.
Stable Discharge: Provides a consistent voltage curve, ensuring your Bluetooth or sensor connections stay stable until the battery is nearly empty.
Lightweight: Weighing less than 2 grams, it is ideal for devices that need to be worn comfortably for long periods.
Rechargeable: High cycle life allows for hundreds of charges, making it a sustainable choice for portable gadgets.
Technical Specifications
| Feature | Specification |
| Chemistry | Lithium-Ion (Li-Ion) |
| Nominal Voltage | 3.7V |
| Full Charge Voltage | 4.2V |
| Capacity | 90 mAh |
| Max Charge Current | 45mA (0.5C recommended) |
| Weight | ~1.5g to 2.0g |
| Dimensions | Approx. 10mm to 15mm (Prismatic/Pouch) |
| Operating Temp | -20°C to 60°C |
Perfect For:
Audio Tech: Replacement batteries for Bluetooth earbuds (TWS).
Smart Jewelry: Powering smart rings, necklaces, or earrings.
Biomedical Sensors: Tiny patches that track heart rate or temperature.
Spy Gadgets: Powering micro-voice recorders or hidden cameras.
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