It is generally not recommended to use this way, although there is no pulse function of the charger, the theory is that the battery can be charged, but it may still harm the battery, although the battery has a protection board, the theory can play a protective role when overcharging or over-discharging, if the overcharge protection voltage is often triggered when charging, the output voltage of the charger is not set correctly.

Because the lithium battery charger uses a three-stage charging mode, the voltage level of the lithium-ion battery and the lead-acid battery is not matched. There are many kinds of lithium-ion batteries, and battery performance and battery protection board parameters may be different. Therefore, lithium-ion batteries do not have universal battery chargers like lead-acid batteries. Batteries are usually shipped with a dedicated charger. To protect the battery, use a special charger.

Lithium-ion battery charging control is to charge in accordance with a constant current, and then when the battery voltage rises to 4.2V, the voltage no longer rises, the charger detects the current, and if the current is less than a certain value, the charging ends. Lithium is sensitive to overcharge, so the protection circuit is complex. For a single nominal 3.6V battery, the maximum charging rated voltage is 4.2V, and the upper limit of allowable error is not more than 1%.

Lead-acid battery, the ideal charging current is pulse, pulse charging with the mains 50-60HZ power supply we use to directly rectify the pulsating DC charging is the best (this is based on the simple circuit, low cost practice), because the self-discharge rate of lead-acid battery is relatively large, the use of power frequency charging, generally with constant voltage charging.

Lead-acid batteries and lithium-ion battery chargers cannot be mixed, and lithium-ion battery chargers are specially used to charge lithium-ion batteries. Lithium-ion batteries have higher requirements for chargers and need to protect circuits, so lithium-ion battery chargers usually have higher control precision.