How do you recharge the battery on a suzuki gs 125?

With a low current 12 volt battery charger designed for motorcycle batteries. Alternatively a car charger in 15 minute spells allowing the battery to cool for 30 minutes between charging. Don't forget to pop the filler plugs out before charging. After the equivalent of 45 minutes to one hour of charge there should be sufficient juice in the battery to start the bike. Go for a ride for at least 15 min to finish charging the battery