How to Turn an Old UPS into an Alkaline Battery Charger! posted on August 2, 2010 by TehnikService | 1 Comment Source: afrotechmods Posted in Tips « Nursery Room Temperature Monitor Program a PIC microcontroller » 1 Comment johnsimons May 13, 2011 5:07 am I find those large SLA batteries for $5 each, from a battery refurbisher/surplus store.My battery had a huge crack in it too. I’m not kidding, that thing never worked.I heard the charger start up one morning, and instead of stopping in 10 minutes as it usually does, it continued to be on for 5 hours. I pulled the plug and eventually opened up the battery pack. UPS Battery Leave a Reply Cancel reply Comment Name * Email * Website This site uses Akismet to reduce spam. Learn how your comment data is processed.