Brian L Posted December 9, 2023 Share Posted December 9, 2023 I recently bought two new leisure batteries for my Autosleeper Kemerton XL. The existing batteries are located underneath the sofa/bed in the lounge , and are vented via a tube through the bottom of the van. The tube is connected to the battery with a L shaped plug (a bit like a jack plug) that is circular in cross section - so round peg in round hole. My new batteries have a square vent hole, which the round plug won't fit into. I've googled extensively, but can only find round plugs, and no mention of anyone else having a similar problem. I know that I'm special, but I can't be that special! The batteries are Numax CXV30HRMF Sealed Leisure Batteries, which I bought from Tayna (who can't offer any solution). I've also emailed the manufacturers, Ecobatt, but haven't had a response as yet. Any thoughts appreciated. I've installed the batteries without the vent tube, but I'm obviously slightly concerned as they are sited in the habitation area. The vent hole is about 1cm wide by about 0.5cm high Quote Link to comment Share on other sites More sharing options...
onecal Posted December 9, 2023 Share Posted December 9, 2023 Hi You say Numax CXV30HRMF Sealed Leisure Batteries, may have a valve fitted and may be just for external lockers. Always of course ensure you are using the correct charging and they are placed in a battery box which itself should be vented outside. Contact Numax (Ecobat) for further advice Regards Quote Link to comment Share on other sites More sharing options...
rayc Posted December 9, 2023 Share Posted December 9, 2023 I read on another forum that "Tayna Batteries say: "This battery (Numax CXV30HRMF) doesn't need venting as it is sealed and has a special lid which recombines the gasses back into the battery". Quote Link to comment Share on other sites More sharing options...
onecal Posted December 9, 2023 Share Posted December 9, 2023 Hi Yes lots on forums about same and only for external lockers but the safest option if inside as OP suggests is to place in battery box that is vented to the outside Regards Quote Link to comment Share on other sites More sharing options...
Alanb Posted December 9, 2023 Share Posted December 9, 2023 As a temporary measure, if the original elbow will fit snuggly into the slot, perhaps you could seal the elbow with Blue-tack, or similar. Alan Quote Link to comment Share on other sites More sharing options...
Derek Uzzell Posted December 9, 2023 Share Posted December 9, 2023 Evidently this battery's non-standard vent is nothing new. There are several reviews of the Numax CXV30HRMF battery on the Tayna website that mention this peculiarity, including a 2014 review that said The product description did not mention that these batteries were supplied without venting kits or that the oblong vent holes on the batteries wouldn't receive the normal round vent tubes and therefore only suitable for external lockers. When discussed with Tayna customer technical services they seemed unaware of this and offered no help. This link is to a 2013 RoadPro FAQ file about Banner "Energy Bull" Leisure batteries and includes the following It was regularly advised on motorhome forums that the electrolyte-level of Banner "Energy Bull" leisure batteries should be regularly checked as they could lose water at an unusually high rate. The batteries were not 'sealed' and had removable cell-caps through which water could be added when necessary and this makes me doubtful that they had 'recombination' technology. Rapido used to factory-install "Energy Bull" batteries and these were always fitted with a vent-tube even when the battery was mounted outside the motorhome's habitation area. (In the Banner battery's case a non-standard vent-tube was needed.) Even if a 'sealed' battery is the 'recombination' type and, consequently, its electrolyte loss should be minimal in normal use, if a fault does occur and the battery gasses with a vengeance, if there's no vent-tube and the battery is within a motorhome's habitation area, the result is inevitable. Quote Link to comment Share on other sites More sharing options...
Derek Uzzell Posted December 10, 2023 Share Posted December 10, 2023 For what it's worth, this link is to a NUMAX catalogue .pdf file and data on the sealed leisure and marine CXV range are on Page 4. https://www.tayna.co.uk/docs/catalogues/numax/numax-catalogue.pdf Two variants of the XV30 battery are listed - XV30HMF or XV30HRMF - with the obvious difference being that the latter has the less-usual Terminal Layout "0" (rather than "1"). The two variants also have single terminal posts, not the double posts of the XV23MF to XV35MF products. This 2012 entry http://www.factorfocus.ie/index.php/numax-adds-to-xv-leisure-battery-range/86 includes the statement The range is manufactured using state-of-the-art plate design, semi-traction paste, envelope construction and gas recombination technology, which means that they will last substantially longer that a conventional flooded leisure battery. As a result, every Numax XV battery comes with a three-year warranty. Although there are plenty of on-line mentions of these Numax batteries being 'recombination' type, all such entries highlight that this should make the battery longer-lasting than non-recombination equivalents (a not unreasonable claim), but there's nothing I can find saying that they do not need to be vented if they are installed within an unvented compartment inside a leisure vehicle. Apparently Manbat is now called Ecobat https://www.ecobatbattery.com/about-us/our-group/our-history/ Quote Link to comment Share on other sites More sharing options...
onecal Posted December 10, 2023 Share Posted December 10, 2023 Hi Lets see what reply the OP gets back from Ecobat Regards Quote Link to comment Share on other sites More sharing options...
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