Running the car for everyday use will require the right battery as far as CCA, etc.

Good luck!

To be quite honest there is not any particularly special kind of battery. There’s an AC Delco in mine. I would call a store such as Napa, Pep boys, S&S auto, autozone, etc and ask them for a battery that will fit an 85′ 944. That way you can actually get some price quotes etc. But a standard battery that will fit the right size will be just fine. The only reason you’d need to worry about “types of batteries” to fit your 944 would be if you start getting into the lightweight batteries to lose weight for weight reduction, etc.

Hope this helps. This will be a good way to get some quotes too, heck I even found a battery at walmart for my 924 for $40… has lasted me a long time! No worries, it doesn’t require any special “OEM porsche battery” if that was what you were wondering.

I saw your other question saying it has sat for about 8-9 years. Make sure you also clean out the fuel injectors and do a full tuneup on it where it’s sat that long, also ensure to inspect all your cooling system hoses and rubber fittings for cracks and leaks. Make sure to check the fusebox as well to make sure the wiring doesn’t look brittle or bad. And last but not least bleed your hydraulic system! That means your brakes AND clutch! They’ve probably absorbed a ton of moisture and you don’t want an iffy brake or clutch system. If you need pictures or a how to let me know, i recently wrote up a how to guide on a lot of 944 maintenance and have some pics and such for it, you’re welcome to email me.

And most importantly BEFORE YOU START IT UP! CHECK YOUR TIMING BELT! It is probably horribly cracked, brittle and ready to break by that period of time! These are interference engines, you don’t want that to snap when you first start it up, or you’ll be doing a lot more than just a tuneup, and your car will be getting new valves which will set you back about $,$$$. I would make that top priority. You can do the timing belt yourself for the cost of tools from 944online and the timing belts from there (or pelican parts) for a total of around $200-300 (cheaper than the $1500-2000 the dealership will quote you) if you are willing to spend 3-4 hours doing it. Otherwise, you’ll be chancing the engine, the interval for the timing belt is 3 years or 30,000 miles, whichever comes first! I would also pull the plugs and shoot a tiny bit of penetrating oil down the cylinders and let it set for a few days before trying to start it just so you don’t chance snapping any piston rings. Drain the fluids, put in new fluids (these transmissions love the 75w90 amsoil synthetic) and do the oil… I could go on, but just make sure you run real thorough through the car.

Best of luck to you on getting the car back in a driving state. If it’s sat for that long (even garaged) it’ll need work. Be patient and you’ll get her back on the road, just be patient and do it all proper and she’ll be another happy 944 on the road. I recently revived a 924 that sat for TEN years in the open elements! My 944 thankfully didn’t need that much TLC LOL.

Again, ask away if you have any questions