Depends on the amperage you are applying to it. Read the charger manual.
That depends on the amp-hour capacity of the battery.
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.
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
If it is totally dead charge it for 2 hours at 10 amps.
No
To estimate how long a 12V 20W solar panel will charge a 200Ah battery, you first need to consider the panel's output. A 20W panel at peak sunlight (about 5 hours of effective sunlight per day) produces roughly 100Wh daily (20W x 5h). To fully charge a 200Ah battery at 12V, you need 2400Wh (200Ah x 12V). Therefore, it would take around 24 days of optimal sunlight to fully charge the battery, assuming no energy loss and ideal conditions.
Till the battery is fully charged. -Could be 4-12 hours.
You can safely charge it with a 15 amp charger. You can also charge it with a 1 amp charger it will just take longer. Do not overcharge the battery.
A good auto battery will hold it's charge for at least 6 months or longer.
No.
No