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My elderly 43 pound D34 Optima yellow top C20 55 amp hour battery is failing to hold a charge long enough for an extended observing session with my Obsession 18 classic with SC/AN, I have a powered ground board on my scope. At the end of a session AN/SC was not behaving normally, and the battery was under 8V. I thought it would be helpful to ask what deep cycle batteries those with a setup similar to mine use (brand and C20 amp hour capacity). I use an AGM battery (Absorbed Glass Mat) as my understanding is that type of battery is better than a lead acid battery for deep discharge, and it is cheaper than a gel battery. An identical replacement battery is around $250. I just haul my battery out into the field for use, it is not in an enclosure. I have terminals on the battery which are attached to a fused power cable, then which goes into the ground board. Pro tip: attach your cable permanently to the battery terminals rather than using spring loaded clamps which you attach and detach for each observing session: if you get the polarity wrong be prepared to spend a lot of time replacing fuses. Ask me how I know this! I thought it might be nice to have a power supply with a built in voltmeter so I could know the battery charge without having to pull out a multimeter. I have seen kits online for battery boxes for batteries that include cigarette style plugs, built in USB outlets and such. Most are for applications like ice fishing and so use small 7 amp hour batteries, my power needs are likely greater if the scope is slewing through the night and running dewheaters for the secondary mirror, telrad and finderscope. Does anyone use such an enclosure or built a battery box kit successfully? I like the fact I can run my scope for at least a few days without recharging with the D34 battery, but the battery is a little awkward to lug long distances as it weight 43 pounds and I carry it with a small strap that crosses the top of the battery. Optima has smaller battery sizes such as D35 which has 48 amp hours and weighs 36 pounds, or D51R which has 38 amp hours and weighs 26 pounds. What battery size do those of you with SC/AN and multiple dewheaters use? Does anyone use a heavy battery mounted to a cart for easier transport? I mainly use the scope to home, where there is a power source available. Thanks! Greg I enjoy the capacity of the 55 AH battery, but it is a b

?I apologize up front for is tiny promo. But if anyone is interested in a FilterSlide, for the month of April throughout these difficult and isolating times, I'll pay for shipping anywhere on the planet. You can see my website, off list of course! Also, for anyone interested, virtual NEAF starts at 10 AM this morning. Eastern standard time: https://www.neafexpo.com/ Thanks, -Roger 18" Classic Obsession www.astrocrumb.com

Hello Group, In the voice of Rod Serling in Twilight Zone; "Submitted for your approval:” Some of you that may know this, but I make the decals for Dave Kreige. Hopefully the attachment will go through. I’ve had a request for a new design as a different product. A user had asked for a decal with a black background and white text. So I can make it as a decal, and/or as white vinyl applied graphics with no vinyl where there is black. So when applied to a black object, it will be a white logo as seen on the picture. Would this be something as an option that people would be interested in? Also, after enjoying being Charlie Stark’s web twin (https://www.marklessastronomics.com), for almost 20 year, I have redesigned my web page for anyone interested in FilterSlides, https://astrocrumb.com It has more info and stuff towards the bottom of the page. -Roger 18’ Classic Obsession www.astrocrumb.com

I have used auto wax on my 15” classic ebony star ground board but I have glass board on the 18UC and am wondering if anyone knows how to “grease or wax” the glass board on these scopes. Thanks for any information. Paul McCallum Get Outlook for iOS

Just to get registered as someone who can send mail.... I'd also be willing to contribute $ to aid the move. And if be willing to take a more active role as needed, the at the moment I'm out of country for a couple months, so not really to jump in with both {or even one} feet right away. Mark Get Outlook for Android

Does anyone have suggestions on what gear I could add to my OEM UC18 with ServoCat to permit extended exposures, say 240s or more?

My first test was from my personal email. This is through the Groups.io GUI. Is this working for anyone? Dragan Nikin Chicago Il 60631 25" f/5 #610 30" f/4.5 OMI EVO

Is anyone seeing this? Is anyone posting? Dragan Nikin Chicago Il 60631 25" f/5 #610 30" f/4.5 OMI EVO