I assume that the charger us capable of charging NiCd/NiMh, Li-Po and SLA batteries. Look at the buttons on the front or top of the charger. You'll need to scroll through the various menus on the charger to select the battery type; then voltage and amperage. The charger may even have discharge or battery cycling capabilities.
I have a similar charger
and below is the short version of how I set it.
The left button (Batt Type/Stop) probably scrolls throught the battery menu - select PB or Lead.
The right button (Start/Enter) allows you to select the various sub menus.
Push the Start button to pull up the charge menu; use the + (increase) and - (decrease) keys to select the specific item.
Push the start button - to select charge amp rate, use the + button to match the amp rating of the battery.
Push the start button to select the volt rate of the battery, use the + button to match the volt rating.'
Push the start button again, and connect the battery. Push the start button to start charging, you may have to push Start again to confirm charging.