Yes, the amp hour rating gives you an idea of the capacity of the battery and charger. The charger and battery need to have the same voltages. i.e. dont try to charge a 6v battery with a 12 v charger. The battery will be charged until it is full.
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
Yes you can. Connect the chargers positive lead to the positive of one battery, then the negative side of that battery to the positive side of the other battery, then connect the negative lead of the charger to the negative of the second battery. Double check all your connections and turn on the charger.
No, not possible. The charger has to go to higher volts than the battery being charged.
12v means it is suitable for any 12v dc current purpose the 18ah means it has an amp hour rating of 18 its a measure of how long the battery can work from full charge until it would need to be charged again ex. the bigger the ah rating the longer you could turn the starter for before the battery would run flat
yes a 5ah battery is a longer working battery than a 4ah so it is actually better than the 4ah
Yes you can. The charger has what is called a trickle charge and will need to be left charging at least overnight and maybe for two nights dependant on how little charge the battery has left.
No, you can not charge a 3V battery with 12V charger.
No
No.
No
NO, voltage of the charger must match the battery voltage.
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
Depends on the amperage of the charger. A 10 amp charger will charge it in about 1 hour.
yes
No, you need a 24 volt charger.
You can but you can alos easily overcharge the battery.
No, you must use a 14.4 volt charger.