The universal charger charges the battery of the electronic watch.

The batteries in our commonly used electronic watches (including quartz watches) are generally disposable batteries (except self-contained rechargeable batteries), so charging is not recommended and should not be charged, because the internal structures of disposable batteries and rechargeable batteries are different. Rechargeable batteries will generate heat and gas when charging, and generally there are small holes for exhaust, while non-rechargeable batteries do not consider exhaust holes, so charging batteries may cause excessive battery pressure and explosion! Therefore, if you must charge the non-rechargeable battery, you must control the charging current to avoid the battery heating caused by excessive current, which will cause safety hazards. At the same time, it should be noted that the general universal charger is used to charge the mobile phone battery (voltage 5v), so it depends on whether the universal charger can provide a suitable voltage (1.5v or 3v) for the watch battery when charging.