, battery loses its charge, grinding noise

Assuming you know how to test automotive electrical circuit's ,test main power (battery + voltage ) & negative grounds ? Voltage drop test PCM power an grounds . check battery voltage , charging (alternator ) system .
Charging System Problem Voltage Drops
Electric Testing Techniques You Need to Know

http://www.bbbind.com/free-tsb


Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

PCM power and ground testing avi

I don't know year--make--model? Use a digital multimeter across battery post, everything off. The generic spec for a full charge is around 12.6 volts. Generic info says if it gets down to 12.4 volts or less, get it charged. Check your charging system. Check flywheel teeth and starter drive gear, see if looks ok.
You can do voltage drop test for starter motor circuits. If you try that, make sure tranny is in park or neutral and parking brake is set. You may be way ahead of me with your testing? Just my opinion.

did you fill the oil ? it has nothing to do with grinding noise,brake is not releasing, remove and inspect brakes and that parking brake is fully releasing. loss of power due to brake dragging.

Check your connections at the battery and alternator. Make sure they are tight. Also make sure that your positive battery cable is not shorting out against anything.

Prognosis is really bad, hate to tell you. Ticking comes from the valve lifters, losing lubrication due to lack of pressure and running dry. At redlights, when revs are at idle, oil pressure drops a lot, and engine really suffers. Have the vehicle taken immediately to a shop for proper diagnose and to see if engine can still be saved. The loss of power comes from the valves not actuating properly. Hydraulic lifters need oil at a decent pressure to "charge" , and if not charged, they will stay compressed, ruining valve lifting operation.

Charging system issue on car.
The car battery,alternator,fuses and relays needs to be inspected.
I suggest you to check out this help links given.Click the link below to go through the procedure,so as per that you can troubleshoot the problem .
How to inspect Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-inspect-vehicles-alternator.html

--------------
How to Test Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-test-vehicles-alternator.html

------------
How to Service Vehicles Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-service-vehicles-alternator.html
------------
How to Replace Alternator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-alternator.html

----------
How to monitor Vehicles charging system?

http://repairhelpcenter.blogspot.com/2011/11/how-to-monitor-vehicles-charging-system.html

-----------
Car Alternator making noise? http://repairhelpcenter.blogspot.com/2011/11/car-alternator-making-noise.html
---------Car Alternator Working Intermittently?

http://repairhelpcenter.blogspot.com/2011/12/car-alternator-working-intermittently.html

----------
Car Alternator Bearing Makes Grinding noise?

http://repairhelpcenter.blogspot.com/2011/12/car-alternator-bearing-makes-grinding.html

----------
How to Inspect Alternator Drive Belt?

http://schematicsdiagram.blogspot.com/2011/12/how-to-inspect-alternator-drive-belt.html

-----------
How to replace Alternator Drive Belt? http://repairhelpcenter.blogspot.com/2011/12/how-to-replace-alternator-drive-belt.html----------- Power windows not working after car wash?

http://howtobyme.blogspot.com/2011/11/power-windows-not-working-after-car.html

--------------
Car battery loosing its charge overnight?

http://schematicsdiagram.blogspot.com/2011/11/car-battery-loosing-its-charge.html

-------------
How to maximize fuel economy on your vehicle? http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html
-------------Charging system problem troubleshooting? http://technoanswers.blogspot.in/2012/02/charging-system-problem-on-chrysler-lhs.html
------------For All types of Power window problem http://repairhelpcenter.blogspot.com/2012/01/pontiac-grand-am-power-window-not.html----------This will help.Thanks.

LOSING POWER WHEN RUNNING COULD BE LOOSE BATTERY CABLE.FAULTY ALTERNATOR.NOT CHARGING BATTERY.CHECK BATTERY VOLTAGE SHOULD BE 12.6 VOLTS.WITH ENGINE RUNNING ALTERNATOR POWER OUT PUT SHOULD BE 13.5 - 14.5 VOLTS WITH ENGINE RUNNING IF NOT ALTERNATOR BAD.CHECK ALTERNATOR BATTERY FEED WIRE CHECK ALTERNATOR VOLTAGE REGULATOR WIRES AND CHECK ALTERNATOR FUSE AND MAKE SURE DRIVE BELT NOT LOOSE.BESURE TURN OFF RADIO BEFORE REMOVING NEGATIVE BATTERY CABLE TO KEEP FROM LOSING RADIO CODE.

the faster you drive tha louder the grinding noise .your bearings are all worn out

how can it be that your battery and alternator are good but u still loose power??? then u'll have to check
1) your battery
a) turn your car off then check if your battery keeps regular Voltage should be around 14
b) turn your car on including all LIGHTS and FANS and see if its still 14 if its not 14 and going down then you have a power loss in your battery and your battery doesnt provide enought charge to Alternator

2) Alternator
For your car its OK to use battery with 75A if you put lets say 100A then you'll simply kill your altenators brushes

ck compression sounds like a blown head gasket between 2 of the cylinders