Sealed cell is the only way to go
First I agree the sealed cell is the only way to go. You will be amazed at the difference sealing the cell makes. Be careful to seal the sides also. I had to leave the bottom open to have enough liquid flow up through the cell. Please be aware that many vehicles vary in output voltage and this will dictate how many plate you will need. I have also found that I get a large difference in current flow when changing from the bench to the vehicle. I use a battery charger or a deep cycle battery on the bench. Both of these give similar results but when connected to the truck the current will nearly double.