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2nd bttery bay ribs.jpg
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Aux Battery vent 8.jpg
BCI Group 40R Deka 640RMF battery showing vent hose run forward to windshield washer reservoir area 1430 viewsRecessed post "Euro profile" battery to "match" OEM and stock Land Rover bracket; note that the Traxide SC80-LR module is mounted at an angle to allow for the main cable to sit under the cover so cover still closes.
The battery is a nominal 7", (180mm), high, but sits on a 1" battery spacer set under to raise the bottom front end of the battery such that the approx 11", (290 mm), length of the BCI 40R battery rises above the angled plastic nibs at the forward end bottom of the case front; hence sufficient space, (1/4", 5mm) remains at the brake reservoir end.

Also the 40R battery does not have hold down "flanges" on each end; on the sides yes, but not the ends so no additional length is required.

When I had to replace the 40R, this time I installed the shorter, (9.625"), taller, (7.5") Interstate BCI 47 / DIN H5 battery which eliminated the spacer on the bottom and better fit the stock LR tie down bolt lengths. Deka also has a BCI 47 / DIN H5 that would work fine as well.
Deka BCI 40R EN T6 aux battery 0379.pdf
Deka Battery Dimension Data615 viewsThe battery size that I installed for my auxiliary was a BCI 40R battery as it was for me the easiest to fit and was also a cranking battery. The case profile was such that no tie down fins were located on either bottom end, (sides yes), and length wise, it was only about 11" (290 mm) long. As such, I did not have to grind the nibs at the front bottom of the plastic surround.

I did however raise the bottom of the battery above the angled nibs as I set the battery on a 1" (25mm) high plastic spacer. The total height, (battery plus spacer), was about 8" (200mm) so the battery top still fit under the Land Rover factory cover.

For the Aux battery, when I replaced the 40R, I installed an Interstate BCI 47 which is similar in size to a DIN H5. I was therefore able to eliminate the vertical spacer as the Group 47/H5 is the same height as the DIN H7/H8 stock LR spec starting battery. As such, the standard battery tie down bolts can be used without modification. The Group 47 battery is 9 11/16" long x 6 7/8" wide x 7 1/2" (190mm) high.
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Awning207 viewsThere are many bolt slots in the expo rack, bottom ribs,
side rails on the inside and on top of rear rail.
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IBS controller189 views
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IBS contoller showing battery condition (engine off)217 views
Interstate Battery Sizes and Specs.pdf
Interstate Battery Dimension sheet641 viewsThis sheet is hard to find - the sheet is not on the Interstate corporate web site but some dealer web sites display it. The pdf shows most of their available batteries including the H7 and H8 sizes that are the LR North America replacement batteries for the main starting battery. These batteries are of the Land Rover desired "shallow" cycle high discharge current Maintenance Free, (Ca Ca), internal construction, (not AGM, but instead, Wet Flooded Lead Acid with battery "caps" and Ca grid separators).

For the AUX battery , the H6, (BCI Group 48), is probably similar in dimensions to the Varta E12V75N that is popular in Australia. For that battery to fit in the second battery compartment, you must grind out the angled nibs on the inside front bottom of the LR black plastic surround, something I did wish to do and hence installed a Group 40R on a spacer. Alternately, one can choose an Interstate BCI Group 47 which is similar to a DIN H5 for the AUX location. I did this when I had to replace my 40R. No vertical spacer is required and the stock battery tie down bolts and clamp work well.
my_D4_at_Gibsons_-_may_2022.jpg
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nestle-dibs-crunch.jpg
Thread upload4 viewsImage uploaded in thread 168440
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Thread upload16 viewsImage uploaded in new thread
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IBS split charge relay101 views
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IBS Split Charge controller132 views
Varta Battery Dimensions.pdf
Varta Battery Dimension chart570 viewsThis pdf provides Varta dimensions for among others, the E12V75N, (old DIN H6 or 85605 or BCI Group 48 size). This appears to be a deep cycle battery and the choice for many re the Aux battery install as long as you are willing to grind away the angled nibs at the bottom front of the battery surround. My choice was a shallow cycle battery intended for cold weather related engine starting rather than winch use.

Note the pdf Varta batteries are all deep cycle batteries suitable for running fridges, winches etc, rather than for engine starting and hence a good Aux battery if those are the intended uses rather than engine starting.

Varta now makes a Varta G14 with AGM technology and known as a Stop Start Plus battery. It is 95Ah, CCA of 850A; length 353mm; Width 175mm; Height 790mm and is specific for these newer stop start vehicles such as some D4's. For the 3's, one is still probably better off with an H8 sized battery but of the older Wet Flooded Lead Acid type and battery caps rather than a sealed AGM.

The Land Rover part number for the recommended battery is LR033179.
     
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