{"title":"JMI Battery Pack Holders","description":"\u003cp\u003eJMI battery pack holders mount a field battery directly on a JMI Wheeley Bar, so power rolls with the telescope; an XL version takes larger packs. Part of \u003ca href=\"\/collections\/battery-packs-and-power-solutions\"\u003eTelescope Batteries \u0026amp; Portable Power\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"jmi-wheeley-bar-battery-pack-holder","title":"JMI Wheeley Bar Battery Pack Holder","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe JMI Wheeley Bar Battery Pack Holder is a heavy-duty steel cradle that bolts to the frame of a Universal Wheeley Bar so the power supply travels with the scope. The cradle takes packs up to 5½″ × 10″ and has a rimmed edge that keeps the pack seated while the bar is rolled over uneven pavement. It mounts with the bar’s existing hardware in about five minutes and weighs 3.625 lb. Made in the USA by JMI.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It’s For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you…\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003erun a mount, dew heaters or a camera from a portable battery and currently set the pack on the ground beside the tripod\u003c\/li\u003e\n\u003cli\u003emove the scope between observing positions and would rather not drag a power cable across the grass each time\u003c\/li\u003e\n\u003cli\u003euse a marine or jump-starter style pack that fits inside 5½″ × 10″\u003c\/li\u003e\n\u003cli\u003eown a Standard Medium, HD Medium, HD Large or AP Pier Mount Wheeley Bar\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSteel cradle:\u003c\/strong\u003e heavy-duty steel with a corrosion-resistant finish, sized for packs up to 5½″ × 10″.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRimmed edge:\u003c\/strong\u003e the raised lip keeps the pack from walking out of the cradle while the bar is in motion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExisting hardware:\u003c\/strong\u003e the holder uses mounting points already on the Wheeley Bar frame, so no drilling and no extra fasteners are involved.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFive-minute fit:\u003c\/strong\u003e most owners complete the first installation in about five minutes, after which the cradle stays on the bar.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-bar fit:\u003c\/strong\u003e one part covers the Standard Medium, HD Medium, HD Large and AP Pier Mount bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.625 lb:\u003c\/strong\u003e light enough that it changes nothing about how the loaded bar rolls or balances.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eMechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe cradle is a formed steel tray rather than a strap or a hook, which matters for a battery: lead-acid and lithium packs are dense and concentrated, and a flexible retainer lets that mass swing as the bar crosses a seam in the pavement. A rigid tray carries the pack’s weight through the frame and the rimmed edge takes the lateral load, so the pack stays where it was set down. Mounting at the frame also puts the mass low and inboard, below the tripod feet and close to the wheel base, which keeps the centre of gravity of the whole assembly lower than it would be with the pack strapped to a tripod leg.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCarrying a 17 Ah class power pack alongside a mount on a rolling Wheeley Bar\u003c\/li\u003e\n\u003cli\u003eKeeping a dew heater controller supply with the scope while moving between observing spots\u003c\/li\u003e\n\u003cli\u003eImaging sessions where a camera, mount and dew straps all draw from one field battery\u003c\/li\u003e\n\u003cli\u003eOutreach nights with cables kept off the ground and away from foot traffic\u003c\/li\u003e\n\u003cli\u003eRunning a second holder for a separate pack when the mount and the heaters are powered independently\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe standard holder fits the Universal-style Wheeley Bar line: Standard Medium, HD Medium, HD Large and AP Pier Mount. The Triangle Style and Sky Trekker Dobsonian platforms use a different frame and take a different approach to accessories. For the HD Shorty, we are happy to check the fit before you order. On the battery side, the 5½″ × 10″ opening covers most astronomy field batteries — Celestron PowerTank 17 and PowerTank Lithium Pro, Sky-Watcher 17 Ah, Talentcell 12V LiFePO4 packs, marine jump-starter style units and most shoebox-format supplies. Packs larger than that are served by the Battery Pack Holder XL, which takes up to 15¾″ × 11¾″ and fits the HD Medium and HD Large bars only. Send us your bar model and the dimensions of your pack and we will check the combination for you.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe battery pack is sold separately.\u003c\/strong\u003e Product photos show a pack in the cradle for scale; the holder ships on its own.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe opening is 5½″ × 10″.\u003c\/strong\u003e Packs above that footprint are the XL holder’s territory, and the XL fits only the HD Medium and HD Large bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Triangle Style and Sky Trekker platforms use a different frame.\u003c\/strong\u003e This holder is made for the Universal-style bars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo holders can share one bar.\u003c\/strong\u003e Most HD Medium and HD Large bars have room for a pair, which suits a separate mount supply and dew heater supply. We can confirm placement and clearance for a specific bar configuration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShipping weight is 3.625 lb.\u003c\/strong\u003e It is a small steel part and arrives in a correspondingly small carton.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to install?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. The cradle bolts straight to the Wheeley Bar frame using hardware that is already on the bar, with no drilling and nothing extra to buy. The first fit takes about five minutes, and the holder then stays on the bar between sessions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size battery pack fits?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003ePacks up to 5½″ × 10″. That covers Celestron PowerTank 17 and PowerTank Lithium Pro, Sky-Watcher 17 Ah, Talentcell 12V LiFePO4 units, marine jump-starter packs and most shoebox-style supplies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Wheeley Bars does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eStandard Medium, HD Medium, HD Large and AP Pier Mount. For an HD Shorty, get in touch and we will check the fit first.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan two holders go on one bar?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. Most HD Medium and HD Large bars take a pair, which is a common arrangement when the mount and the dew heaters run from separate packs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the pack stay put while the bar is rolling?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe rimmed edge of the cradle is there for exactly that. The pack sits inside the rim rather than on a flat surface, so it is held laterally as the bar crosses uneven ground.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat if my pack is larger than the opening?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe Battery Pack Holder XL takes packs up to 15¾″ × 11¾″. It fits the HD Medium and HD Large bars, and not the Standard Medium, HD Shorty or AP Pier Mount.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 3.625 lb steel cradle that bolts to a Universal Wheeley Bar in about five minutes and carries a battery pack up to 5½″ × 10″ with the scope, so the power supply travels on the bar instead of trailing a cable behind it.\u003c\/p\u003e","brand":"FarpointAstro","offers":[{"title":"Default","offer_id":53297182933103,"sku":"BRKTBP","price":91.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/BRKTBP-1-e1611105559178.jpg?v=1783194174"},{"product_id":"jmi-battery-pack-holder-xl-for-wheeley-bars","title":"JMI Battery Pack Holder XL for Wheeley Bars","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe JMI Battery Pack Holder XL is an oversized steel cradle that carries a field power supply on the frame of an HD Medium or HD Large Universal Wheeley Bar. It accepts packs up to 15¾″ × 11¾″ — a far larger footprint than the standard Battery Pack Holder, which tops out at 5½″ × 10″. The tray is heavy-duty steel with a corrosion-resistant finish and a rimmed edge that keeps the pack seated while the dolly is moving. It bolts to the Wheeley Bar frame using the bar’s existing hardware, so no drilling is involved, and the first installation typically runs about five minutes. Shipping weight is 7.4 lb. Made in the USA by JMI, part of the CXB Astro family.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis is a good match if you run an HD Medium or HD Large Wheeley Bar and your power source is larger than the 5½″ × 10″ footprint the standard holder accepts — a Group 24 or Group 27 marine battery, a Pelican-case style power box, a twin-cell LiFePO4 pack, or a full power-distribution box with its own fuse panel and outputs. It also suits you if you would rather carry one large pack in a single rimmed cradle than split the load across two smaller holders.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e15¾″ × 11¾″ capacity:\u003c\/strong\u003e Takes large marine batteries, Pelican-case power boxes, dual-cell LiFePO4 setups, and full astronomy power-distribution boxes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-duty steel cradle:\u003c\/strong\u003e Welded steel with a corrosion-resistant finish, sized for the weight of a Group 27 battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRimmed edge:\u003c\/strong\u003e The raised lip around the tray holds the pack in position while the dolly rolls over seams and uneven ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExisting-hardware mounting:\u003c\/strong\u003e Bolts to the Wheeley Bar frame with the fasteners already on the bar — no drilling and no additional fasteners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.4 lb shipping weight:\u003c\/strong\u003e Light enough to leave installed permanently without meaningfully changing how the bar handles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in the USA\u003c\/strong\u003e by JMI, part of the CXB Astro family.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCarrying a Group 24 or Group 27 marine battery on an HD Large Wheeley Bar for all-night imaging runs.\u003c\/li\u003e\n\u003cli\u003eMounting a single power-distribution box with fuse panel and multiple outputs so mount, camera, dew heaters, and focuser all draw from one place on the dolly.\u003c\/li\u003e\n\u003cli\u003eRolling a fully powered rig from a garage or observatory to an observing pad without lifting the battery separately.\u003c\/li\u003e\n\u003cli\u003eConsolidating a twin-cell LiFePO4 setup into one cradle instead of two standard holders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe XL holder is designed for the JMI \u003cstrong\u003eHD Medium\u003c\/strong\u003e and \u003cstrong\u003eHD Large\u003c\/strong\u003e Universal Wheeley Bars, and it needs the tripod legs extended above their minimum setting for the wider tray to clear the frame. It does not fit the Standard Medium Wheeley Bar, the HD Shorty, the AP Pier Mount bar, the Triangle Style bar, or the Sky Trekker series — the Standard Medium frame in particular is narrower and has no mounting room for the XL footprint. On those bars, and on HD bars running near minimum leg extension, the standard Battery Pack Holder (5½″ × 10″) clears the frame, and two of them can be mounted side by side for two separate packs. The battery pack itself is supplied separately. Tell us which Wheeley Bar you own and how far your legs typically sit from minimum, and we will confirm the fit before you order.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHD Medium and HD Large only.\u003c\/strong\u003e The Standard Medium, HD Shorty, AP Pier Mount, Triangle Style, and Sky Trekker bars all fall outside the XL’s fitment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeg extension affects clearance.\u003c\/strong\u003e With the tripod legs near minimum extension, the XL’s footprint can interfere with frame clearance even on an HD bar. Extending the legs further, or fitting two standard holders, both resolve it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe battery pack is not included.\u003c\/strong\u003e The holder is the cradle and its mounting hardware only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity is a footprint limit, not a weight rating.\u003c\/strong\u003e The published figure of 15¾″ × 11¾″ describes the tray opening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo smaller packs in one XL tray is possible but less secure\u003c\/strong\u003e than two standard holders, where each pack sits in its own rimmed cradle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs it difficult to install?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The XL bolts to the Wheeley Bar frame using the hardware already on the bar. There is no drilling and no extra fastener to source, and most owners finish the first installation in about five minutes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does the XL not fit the Standard Medium Wheeley Bar?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 15¾″ × 11¾″ footprint needs the wider frame span of the HD Medium or HD Large bar to mount cleanly. The Standard Medium frame is narrower and does not offer that mounting room.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if my tripod legs sit near minimum extension?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAt that setting the XL tray can run into frame clearance on an HD bar. Extending the legs somewhat further usually clears it; otherwise two standard Battery Pack Holders fit at any leg extension.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I carry two battery packs on one XL holder?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf both packs fit inside the 15¾″ × 11¾″ opening, yes. Two standard holders keep each pack in its own rimmed cradle, which travels more securely.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size packs does it actually take?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUp to 15¾″ × 11¾″ — Group 24 and Group 27 marine footprints, Pelican-case style power boxes, dual-cell or twin LiFePO4 setups, and power-distribution boxes with built-in fuse panels.\u003c\/p\u003e\n\n\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIn short: the Battery Pack Holder XL takes a 15¾″ × 11¾″ power pack, bolts to an HD Medium or HD Large Wheeley Bar frame with the hardware already on the bar, and keeps a full-size field battery riding with the scope instead of carried separately.\u003c\/p\u003e","brand":"FarpointAstro","offers":[{"title":"Default","offer_id":53298010685551,"sku":"BRKTBP-XL","price":177.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/BRKTBP-XL.jpg?v=1783194197"}],"url":"https:\/\/ontariotelescope.com\/collections\/battery-packs-and-power-solutions-jmi.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}