Different types of seal lead acid (SLA) battery chargers!
I would recommend you get a good battery charger with proper indicator and battery full auto cut-off feature. Plus your battery is quite big and you will need to charge it around 0.2C to 0.3C. The former is better for battery longevity.

Get a good automotive battery charger that can charge upto 8A. If you are short of cash, search ebay or your local junkyard and you might find those old manual car battery chargers (with slow and fast) like from Schumacher or Bosch. But with these you have to be careful to keep watch on the amp gauge and prevent from overcharging. 

Also these have the ability to revive batteries with very low voltage(over-discharged) below 9V compared to modern automatic chargers.