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
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
((135AH*12V)/600VA)*85%Efficiency=2.20Hrs
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.
On the Internet I saw a NiMH battery 12V 50 Wh for about $50 USD so ten times that $500
YES
Yes; the 33 amp hours battery will crank longer.
Yes; the 33 amp hours battery will crank longer.
yes a 5ah battery is a longer working battery than a 4ah so it is actually better than the 4ah
No
can a 12v lawn mower sealed battery be charged with 12v battery charger use on cars
The battery is a 12V car battery.
Anything needing 12V to operate.
In order to use the "plug in" pest control with a 12V battery, the device would have to have power requirements less than or equal to that which a 12V battery can provide. The pest control would also need an adapter to use the 12V battery.
Nothing, as long as they're both the same voltage. The 18 Ah battery has just slightly more power. It will work perfectly.
Yes. I had a 23A, 12V, battery for my ceiling fan and replaced it with an A23, 12V, battery, and it worked just fine.
Voltage is the same but amp hour capacity of the car battery is much higher.