You can but you can alos easily overcharge the battery.
You can - but it will take longer for the phone to charge.
No
No.
No
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
NO, voltage of the charger must match the battery voltage.
Depends on the amperage of the charger. A 10 amp charger will charge it in about 1 hour.
Yes, you can charge a 12V 7.2Ah battery with a 12V 300mA charger, but it may take a long time to fully charge the battery due to the lower current output. The charger will provide a safe voltage for the battery, but the charging time could be significantly extended compared to a charger with a higher current output. Ensure the charger is compatible with the battery chemistry to avoid any damage.
Yes, you can charge a 12V 12Ah battery with a 12V 7Ah charger, but it may not be optimal. The 7Ah charger will charge the 12Ah battery more slowly than a charger with a higher output. Additionally, if the battery is significantly discharged, charging with a lower capacity charger could take a long time and may not fully charge the battery if the charger cannot provide enough current. Always monitor the charging process to ensure safety.
yes
No, you need a 24 volt charger.
It is not recommended to recharge a 3V battery with a 12V charger as this may damage the battery. The voltage of the charger should match the voltage of the battery to avoid overcharging and potential safety hazards. It is best to use a charger specifically designed for the 3V battery.