Your warning about Gel cels is accurate. However very, very few UPS units have Gel cells. Many people think they are, even those that sell them. What most use are common lead acid cells that are semi-sealed and the electrolyte is held in a very absorbant blotter like material. A true Gel cell will say GELL CELL on it.The instructions that come with replacement batteries usually say not to chargeinverted. A Gell cell can be charged and operated in any position. The sealed lead-acid cells can be operated in all positions except inverted. I see many batteries sold on eBay advertised as Gell cells but if you get the catalog from the manufacturer you often find that they don't make any Gell cell batteries. I have connected my UPS to a car battery when both had been fully charged and checked for voltage differential before closing the circuit. I found less than 10 Mv. difference. With about 5 feet of #10 wires connecting the external battery I found no problems. I ran a seismograph and computer with monitor for several weeks from it and neither battery was damaged Al Allworth ----- Original Message ----- From: "Charles R. Patton"
To: Sent: Tuesday, May 08, 2001 9:38 PM Subject: Re: Gas Generator recommendations / standby power > Al wrote: > "I have a 250 watt UPS that I put Binding Posts on the back so I can > add more battery capacity when needed. It uses 12 volts." > __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>