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RockAuto says my '89 b250's battery tray is to accept a group 34/78 battery.

I've used 34, 24, 27 and now group 31.

A group 34 flooded battery is

Weight: 38.5 lbs
Length: 10.75 in
Width: 6.875 in
Height: 8 in

They have about 55 amp hours capacity at 20 hour rate, meaning when they are newish and fully charged, they can provide 2.75 amps for 20 hours, before voltage falls to 10.5v, which is considered 100% discharged.

They have generally 120 minutes reserve capacity, meaning they can provide 25 amps continuous for 120 minutes before voltage falls to 7.75v. Again if the battery were new, healthy and fully charged when the 25 amps was first applied.

CCA maxes out abut 800 in this group size, which is respectable.

a CCA test is 'supposed' to represent a 800 CCA battery, that can provide provide 400 amps for 30 seconds with voltage remaining above 7.5v. The battery is supposed to be 0f for this test.

I expect few batteries would make their CCA ratings if actually cooled to 0f and had half their cca rating applied for 30 seconds, but that is supposedly the test parameters.

I am employing a significantly larger Northstar Group 31 TPPl AGM battery

weight 75 lbs
length 13
width, close to 7
height, closer to 10 inches to top of terminals

103 amp hours capacity
220 reserve minutes
1050 CCA.

My original battery tray was rusted. corroded.

I made a new tray, and lowered it and widened it, so it would accept the larger group 31, with width anfd height to spare.

I'm not quite done with this portion of my electrical upgrade and some details shown in the photos is just functional but temporary while I further refine the mounting of battery and surrounding components.

While most batteries with 500 or more CCA will have no issues starting the engine in temps above 40f, a 1050 CCA TPPL Agm turns the starter so fast and my engine catches so quickly it is is almost a bit alarming.

Northstar is sold as X2power by batteries plus, and they add another year to Northstar's 4 year free replacement warranty.

These batteries are amazing, but need some specialized charging when subjected to deep cycle duty, and are not worth their premium in such duty if their peculiar needs are not met.

Namely no less than 40 amp charging current per 100Ah of capacity, when deeply cycled and true full charges are required more often.