Greetings! As usual, documenting everything I do.
Last week I decided to replace the very old and warn out Walmart Everstart batteries the previous owner had installed in our Airstream with a new set from Costco. Just plain jane Interstate lead acid batteries. Well aware of all the perks of AGM or even moving up to Lithium. But not this month.
The Group 24 replacements where $72.99 a pop at Costco, with a core return that came in at 148.98 with FL tax.
Then I got to thinking, why not just jam some bigger 27's in the battery box.
Type 24's have about 75 to 80 amp hours of capacity, or 150 to 160 total (depending on battery maker). Two 6V golf cart batteries will give you about 220 amp hours of capacity. And the two type 27's are around 200 to 210 if I remember correctly.
So I returned my batteries to Costco and got Group 27's which is Coscto fitment code 14.
The difference in price is marginal for the extra power. $78.99 per battery. So literally $6 more per battery.
Here's the skinny on replacing your group 24 batteries with group 27s:
- remove battery cables (negative first)
- pull the batteries and remove the threaded rod (should be a nut welded to the bottom of the battery box.
- the plastic tray is unnecessary and you can trash it.
- drill out the 3 rivets holding the tray to the forward edge of the box and remove the cover.
- remove about 3/8-1/2" from half of the forward tray lip with an angle grinder (you may find it easier if you remove your LP tanks)
- file, prime and paint the cut edge however you like
- place one new Group 27 in thru the new slot and slide it to the opposite side of the box
- replace the threaded rod
- place the second Group 27 into the box and secure the batteries with the wing nut
- re-attach cables (positive first)
- re-rivet the lid or use bolts if you prefer and replace LP tanks and cover
- YOU"RE DONE!!!
If you're really brave, there is a thread somewhere in this section where someone supposedly squeezed group 31's into the battery box. Good luck with that, I'd assume you'd be better of just going to 6V at that point.