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I wanted to have a general consensus on what is usually done in regards to cars in the US which have been converted from a 6v system to a 12v system.

My question comes not for the basic Electricals which is easy and done using a MORDERN battery . Fitted an alternator and also a fuel pump as a back up. To fight the Indian Sub continent heat we fitted a spare fan also. Got a new fuse box and relays done for safety

But do you get or is there anyway to still keep the long battery on the 12 v system. Anyone which still manufacture them today. I would like to get it retro fitted . Keeps a more pure look in the engine bay

Thank you in advance for the help

I don't know of any readily available at the parts store long 12v batteries that would fit the bottom tray designed around the group 2E battery which is around 19 1/2 x 4 1/4. There are commercial batteries about the same length but are much wider.

An interesting approach by a poster at PAC using two 6v Optima batteries which should be readily available everywhere would work.http://www.packardclub.org/forum/viewtopic.php?f=15&t=2251&start=380#p18945 He built a custom hold down which mounts to the original tray to hold two Optimas sitting on the tray. While he is running his batteries in parallel keeping 6v, he does mention the option of placing them in series for 12v. If you wanted to carry the disguise farther some black textured ABS or other suitable sheet plastic could be formed to mimic the square case of the long battery and hide the round battery sides.

Group 3EE is virtually identical in all dimensions to the 2E. Cadillac used the 2E in 50-53, then 3EE in 53 as I recall. 3EE is readily available from specialty antique battery suppliers in the US

That is good information and thanks for correcting my post. I hadn't realized Cadillac used the long battery when they went to 12v. Napa carries the 3EE so maybe it is available elsewhere in the states without too much difficulty. Not sure how common it would be in India.