· Get a Cloudy Nights T-Shirt · Submit a Review / Article    Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User   You are not logged in. [Login] Forum Archives · Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> ATM, Optics and DIY Forum Previous   Index   Next   Threaded   Pages: 1 NKT super member Reged: 09/23/09 Posts: 155 Loc: CT Field battery charger?       #3435588 - 11/07/09 11:21 PM Edit   Reply   Quote Quick Reply   I built myself a field battery for my CGEM based on this site. My question is, what type of charger is recommended for this battery? Would this work: Battery Tender 021-0123 Battery Tender Junior 12V Battery Charger -------------------- CGEM800 Orion 80ED Canon XSi/Meade DSI II Find fellow amateur astronomers: www.ScopeBuddies.com Post Extras:       walt r Post Laureate Reged: 02/13/07 Posts: 3458 Loc: Doylestown, PA Re: Field battery charger? [Re: NKT]       #3435801 - 11/08/09 03:45 AM Edit   Reply   Quote Quick Reply   It will charge the battery in the link but it may take a long time. This charger puts out 0.75 Amps. What is the AHr rating of the battery or more important how many AHr will you remove? Then how long can you wait for a re-charge? The battery is a 125AHr. So at half (max recommended dischare for deep cycle lead acid) discharge the charger needs to put 63.5 AHrs plus losses back in. At 0.75 Amps that will take will over 83 hours. If you only use the battery once a week this works. -------------------- Walt Obsession 18" f/4.45 #1370 AN/SC MK67 Deluxe 6" f/12 Mak-Cass, Super Polaris GEM, JMI MicroMax DSC DIY 60mm f/6 Achromat Cookbook 245 CCD Post Extras:       m. allan noah member Reged: 08/14/09 Posts: 19 Loc: Virginia, USA Re: Field battery charger? [Re: NKT]       #3435901 - 11/08/09 07:31 AM Edit   Reply   Quote Quick Reply   read this- particularly the section on equalizing charge. battery basics Post Extras:       johnnyha Pooh-Bah Reged: 11/12/06 Posts: 1087 Re: Field battery charger? [Re: m. allan noah]       #3436280 - 11/08/09 12:18 PM Edit   Reply   Quote Quick Reply   I highly recommend the CTEK 3300 charger, I have two, they work great, and they are waterproof. -------------------- Johnny Spicewood, TX Sherman Oaks, CA Post Extras:       NKT super member Reged: 09/23/09 Posts: 155 Loc: CT Re: Field battery charger? [Re: johnnyha]       #3436506 - 11/08/09 02:30 PM Edit   Reply   Quote Quick Reply   Thanks, I'll check it out! -------------------- CGEM800 Orion 80ED Canon XSi/Meade DSI II Find fellow amateur astronomers: www.ScopeBuddies.com Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 10 registered and 7 anonymous users are browsing this forum. Moderator:  Don W, Mike I. Jones  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 94 Jump to *International Year of Astronomy 2009* -----   Global Coordination   Cornerstone Projects   Special Projects   Special Task Groups   Global Activities   National and Regional Activities   IYA 2009 in Africa   IYA 2009 in the USA*Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Beginners Forum   Celestial Events   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Celestron SkyScout and Meade mySky   Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning and Intermediate Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   NEO   General Observing   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Other* -----   Science of Astronomy & Space Exploration   AstroWebsites   Space Rocks*Speciality Forums* -----   AstroArt   Astronomy Software & Computers   Stellar Media   Astro Outreach, Clubs and Star Parties*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements CN Forums Home

Cloudy Nights Sponsor: Astronomics