Usage Method Step 1 Connect power supply and plug Type-C charging cable into charging port. Step 2 Put the battery into the charging slot gently, positive and negative directions of the battery consistent with those of the charger. Step 3 Indicator lights are red when charging begins; lights turns green, when fully charged. Step 4 Green lights indicate the battery is fully chard and the charging process lasts 8 hours. Step 5 When the battery is not charged, please remove the battery from the charging slot and put it in the charger or a safe place. Step 6 Power inspection: when the battery is placed in the battery detection position and a light is on, the power is about 20%. When the two lights are on, the power is 80% or so. Warnings 1 For Bluetooth hearing aids, It can only be used for 4 hours after the battery is fully charged. 2 When charging, the battery must be placed correctly, ensure that the positive and negative plates of the battery correspond to poles of the charger. Please refer to the operation manual on the outer packing box of the charger. 3 Do not put the positive and negative electrodes when charging. The reverse charging will damage the battery; 4 Do not stack the battery together to avoid short circuit; 5 It is recommended to charge the battery for 8 hours. Even if the indicator lights showgreen light, do not take the battery down in a hurry, so that the battery can be fullycharged. 6 During the charging, the indicator shows the red light; 7 Do not leave the battery in a discharged state for a long time. Not charging for a long time may cause the battery to fail to charge. 8 Please use 5V DC power supply with safety certification; the charging current should not exceed 2A; do not apply the mobile phone fast charger to charge. 9 Do not charge the disposable battery, otherwise it may cause accidents. 10 Correctly understand rechargeable batteries and disposable batteries. Rechargeable battery (positive pole surface is smooth). Disposable battery (positive pole surface withseveral small air vents) 11 Before charging, keep the battery clean, wipe the battery surface with a paper towel, and keep the contact pin of the charging slot clean and in stable contact. 12 Do not disassemble the charger. Incorrect assembly can result in risk of electric shock or fire.