Same voltage, of course.
Nowadays, most of the strong light flashlights and mobile phone boards are 3.7V, so you can use mobile phone chargers.
They have different charging sockets, which need to be dealt with:
1, keep the USB end of the phone data cable, remove the other end and find the positive and negative poles.
2. Keep one end of the plug on the flashlight charging cable, remove the other end and find the positive and negative terminals.
3, the two lines are connected to the positive, the negative is connected to the negative and do a good job of insulation, it can be charged.
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Note: 1, confirm whether the flashlight battery is 3.7V, otherwise, please do not use this method.
2, check whether the flashlight battery has a protection circuit, if not, you must pay attention to the charging time, charging after the power is used up is not more than 4h (please use).
3, check whether the flashlight battery has a protection circuit, if so, you can rest assured to use.
You can use a mobile phone charger, that is, the kind of old rechargeable battery, you can not directly use 5v charging.