The label ‘3.7V 1500mAh rechargeable’ on a lithium-ion battery cell indicates its nominal voltage and rated capacity. Specifically:
- Nominal Voltage (~3.6–3.7V): This is the average voltage during discharge under standard conditions. Most 3.7V cells charge to a maximum of 4.2V and should not be discharged below 2.5–3.0V for safety and longevity.
- Rated Capacity (1500mAh): This represents the cell’s ability to deliver 1.5 amp-hours of charge, typically measured under gentle discharge conditions (e.g., 0.2C–0.5C at 25°C) down to a specified cutoff voltage.
- Energy Equivalent (~5.55Wh): Calculated as voltage × capacity (3.7V × 1.5Ah), this metric helps compare cells across different voltages.
Real-world performance varies with load, temperature, and aging. These cells power handheld electronics, IoT devices, and embedded systems, offering a balance of cost, weight, and energy density.
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