Just some info for anyone looking for low cost battery chargers, I have gone through a few chargers over the years and most lasted 5 years - or until the first time it was hit or dropped. I have used this one every 1-2 weeks for 10 years to charge a lawn mower lead-acid battery (and dropped on the concrete several times LOL!!). Only thing I have had to do is re-connect the aligator clips from time to time when they have worked loose. Seems like it was around $20-25 at Kragen Auto Parts (now O'Reillys). Slow charger only - not for quick charges.

Schumacher
1.5A On-Board Charger
Model SE-1-12S
Input 120VAC 4A 60HZ
Output 12VDC 1.5A

http://imageshack.us/f/205/chargerki.jpg/