Thanks n4zou for the contents of the spotlight. A 4amp/hour battery 6 volt battery means 24 watts for one hour. A 50 watt bulb should drain that in under 30 minutes. Likely dim in under 20 minutes. I will check the local store today. If they want over $5.00 I will have the web site ship it to them. Next would be to see if a 12 volt replacement bulb would melt the plastic. If not I will switch and use my 12 V system.