Genuine Nokia BL-4S battery is 860 mAh.
It Volts and delivers a total energy capacity of 3.2 Watt-hours (Wh). Third-party replacement brands or high-capacity variants can sometimes range slightly higher or lower (typically between 600 mAh and 1020 mAh), but the standard manufacturer specification is 860 mAh.
Key Details
Model: BL-4S
Voltage: 3.7V
Compatibility: Designed for classic Nokia phone models including the 2680 slide, 3600 slide, 3710 fold, 7020, 7100 supernova, 7610 supernova, and X3-02.