Celestron and Orion both sell a 17 amp/hr and Kendrick has very good 18 and 33 amp/hr that should last several years. See http://www.kendrickastro.com/astro/battery.html The main thing you must not do with the gel cells is drain them down to low or they can not be easily recharged. -----Original Message----- From: utah-astronomy-bounces+djcolton=piol.com@mailman.xmission.com [mailto:utah-astronomy-bounces+djcolton=piol.com@mailman.xmission.com] On Behalf Of Kim Sent: Friday, April 27, 2007 11:09 PM To: Utah Astronomy Subject: [Utah-astronomy] Portable power supply Hi all. I'm looking for a new portable 12V power supply, for use with either my Meade refractor or my 12.5" Cave-Astrola. I had to go to MalWart tonight for my son and I happened to notice a 12V, 22Ahr battery/power supply there for about $60. I didn't catch the manufacturer's name, and I am always hesitant to buy anything from that retailer. Anyway, do any of you have recommendations? I want at least a 15Ahr battery; a built-in inverter isn't necessary (I already have an inverter I could use). Any ideas would be welcome. Thanks, Kim _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com