Negative pressure of microphone start: 100-300Pa
Trickle charging current of control board: 40 ± 20mA (battery voltage is less than 2.6 ± 0.1V)
Charging current of control board: 440 ± 40mA (supporting 0V charging)
Charging voltage of control board: input DC: 5 ± 0.25V
Output voltage: ① load 1.6 Ω, output 3.5 ± 0.15 V; ② When the battery is low, the output requirement is greater than 3.1 ± 0.15V