yea, size is a factor. Most car battery chargers put out to much current for small batteries. Your 1 amp setting may be low enough. Check the specs for your battery. They will give you the maximum charge rate. SLA's run pretty close to regular lead batteries voltage wise, so the charger should be okay that way. You can get chargers for motorcycle batteries that may be closer to what you need. Wal-Mart has one that even comes with a molex to ring lug harness to connect to you battery. You might also check the kiddie electric car section out. I believe some of those use 12 volt SLA's and you might find a replacement charger. The only precaution other than current is , don't leave in on the charger for long periods of time. Over charging for extended periods will shorten the battery life.
