i would not recommend ANY of these backyard alternatives for batteries. These lifts are designed specifically for a certain type of battery and these batteries are also factored into the counterweight properties of the truck. If you try anything other than factory recommended batteries you are asking for a whole sleu of problems and putting yourself at high risk for injury and damaging the lift as well.
You may look at the cost of a battery for this truck and think its too much but look at the cost of any lawsuits, insurance claims and medical expenses and property damage or even a life taken that may occur because of things that will happen due to your negligence and unwillingness to install the right batteries because of cost?

This is a no brainer fellas....
Put the right battery(s) in your trucks so you can sleep at night knowing everything is safer and working as it should be.