1997 850 T-5 no crank/start, low battery voltage...

[dj_v70]

Oh my God, yes, I was making a stupid typo. Very sorry. I meant 11.94, not 19.94.

I have tried jumping the car with another vehicle and still no noise from the starter solenoid at all (I verified battery voltage was present at the starter nut).

I like Misha's suggestion of swapping out with another battery. If you don't have access to one that fits though, I'd check voltage at both starter nuts specifically while cranking. Steps:
a) Put voltmeter ground on engine, not on battery. Alternate voltmeter positive lead between both starter wires. I am assuming 850 has two starter wires, most (all?) cars do. One is connected directly to battery (larger wire) and one (smaller wire) is going through ignition, fuses, etc. If both are still >12V while cranking, you have a starter issue (I doubt this is the case though).
b) If both <12V, change voltmeter ground to battery ground vs engine ground and check both again. If both still <12V and you charged battery, replace battery.
c) If only one is <12V, report back for more troubleshooting...

[RickHaleParker]

That’s dead. Get it on a real charger for a long day.

More like a couple of days to a week. It is probably heavily sulfated. If he trickle charges it then let it float charge for a long time, the lead sulfate crystals might decompose. It depends on how big the lead sulfate crystals are.

[zamador]

I should mention that the battery is back above 12V (I think 12.35 or so) now since I tried to charge it for a while off the Jump-n-Carry... Should I just take the battery to where I purchased it from and have them test/recharge it before going further? It would be pretty easy for me to do, just means I have to walk a mile with a car battery.

[RickHaleParker]

The Jump-n-Carry is not a battery charger.

Go to Walmart and get a Schumacher Speed/Charge. They are a battery Charger/Maintainer/Tester, 10/6/2 amps or 6/2 amps will do.

1. Put the Schumacher on the battery, set it for 6 Amps.
2. Leave it alone for 48 hours or 2 hours after fully charged, whichever comes last.
3. Disconnect the battery for 20 minutes, then measure battery voltage.
4. Reconnect and observe how long it takes to get back to full charge.
5. Disconnect the battery for 20 minutes, then measure battery voltage.
6. Report back here with a written report.

Note: If the battery does not start charging within 4 hours, disconnect the battery for 20 minutes and start over at step one. ... If the Schumacher detects the battery is severely depleted, it will go into Pulse charge mode, they don't always switch to Stage one constant-current charge on their own.

[abscate]

I should mention that the battery is back above 12V (I think 12.35 or so) now since I tried to charge it for a while off the Jump-n-Carry... Should I just take the battery to where I purchased it from and have them test/recharge it before going further? It would be pretty easy for me to do, just means I have to walk a mile with a car battery.

That’s better but still not full. The auto place battery tests are a bit hit and miss so I would skip that, unless you like spoiling a good walk. I wish I could still carry a battery for a mile...

[RickHaleParker]

I wish I could still carry a battery for a mile...

That a good excuse to buy a shiny new Little Red Wagon.
Harbor Freight has Paneled Little Red Wagons for $70.00.