Battery is leaking - 1995 Volvo 850

no year car told at all.
using voltmeter
what is battery voltage at idle.?
not told' 13. to 15vdc is par, if below the alternator is dead or its fuses blown.
if ALT is dead, driving the car , far (30min) will make engine stall and be dead,until battery is jump started or charged.

that lamp comes of a reason, it means
fully load test the battery and test the alternator correctly
check all fuses
scan the OBd2 port with a scan tool for charge system errors.

If the battery is bad,the alternator can in fact refuse to charge it.
intermittent battery cell shorts or opens can do that.
batteries over 7 years are , love to fail.

"it turned on after oil leaked flashy/, " i am not sure what flashy means.

DId the PS pump fail and leak and squirt PS fluid to some electronics
under the hood, that can be vary bad, if did.
be more clear on PS leaks, leaked to where. ? matters

when the battery leaked on top of the battery ?
It would have had corrosion on the battery terminals like a white chalky residue ?
You may need to get a rat tail file and gently file the inside of the terminals to clean the corrosion off or buy new replacement battery terminals and reattach to the battery cables.

If you have a volt meter put the negative probe directly on the negative battery post and put the positive probe directly on the positive post of the battery. If you read 12 volts then try doing this on the battery terminal connectors and see if they read 12 Volts.

Corrosion might be in the cables depends on how bad the leak was .

yes but usually damage from leaking batteries are the battery connections , tabs and wires which can be replaced and or cleaned up to make connections workable --when battery damage exceeds the battery compartment and into the electronics [motherboard and other circuits] usually the price of repair can be close to buying a new one

the oil leak could be a bad valve cover gasket needing replacement, a head gasket leaking oil, a leaking intake gasket and oil running down along the engine block and dripping. it could be an oil pressure switch that is leaking. it is near the starter while driving or engine running can spray oil onto the starter. unless the oil leak is very bad and has been leaking a long time onto the starter will not cause it to act like a dead battery even then not likely. have a starter draw test down to check condition of the starter.

Evap leak detected, (charcoal canister).. Vacuum leaks, GAS CAP will do this, If new cap is installed, disconnect battery for 30 min, then replace battery connections. Fuel tank leaking (rare) could do it.

DID NOT MENTION WHATS LEAKING.BUT YOU NEED TO REPLACE OR FIX WHATS LEAKING PATCHING UP NOT GOING TO FIX.BATTERY LIGHT MOST LIKELY ALTERNATOR NOT CHARGING OR DRIVE BELT SLIPPING DUE TO COOLANT LEAK FROM WATER PUMP OR BAD BELT TENSIONER..CHECK ALTERNATOR OUT PUT WITH ENGINE RUNNING.HOOK DIGITAL VOLT METER TO BATTERY.VOLTAGE SHOULD BE 13.5 - 14.5 VOLTS.IF NOT CHECK ALTERNATOR FUSE AND WIRES MAKE NONE LOOSE OR DAMAGE.ALSO MAKE SURE BATTERY CABLES IS ON TIGHT.FREE FROM CORROSION.

Disconnect the battery and remove it...WEAR PROTECTIVE CLOTHING!! The battery sounds like it is leaking acid and, as such, needs to be replaced ASAP! Once you pull the battery out of the car, only set it down on a surface that will not erode from the acid. If the battery is indeed leaking, you will see the corrosion where the battery was eating away the metal. This will need to be cleaned and neutralized before anything else can happen, if the battery is leaking.

I do think your battery is leaking; sulfuric acid smells like rotten eggs and the smoke is from the acid eating the metal it is coming into contact with.

the reason your trans blows out fluid after you changed the battery is because the original battery is connected to the ****** vent tube i also had this problemb .i thought the vent tube was for the battery but it is for the transmission solution dont reconnect it to the new battery it dont vent the same and plugs off the vent tube builds up pressure in the trans and bows back out the fill tube ! why ford connected the tanny to the battery ill never know . stuppidty !!!

The leak in your evap system is very small at .020. It is more than likely a small split in a hose somewhere. The cap is probably ok, we rarely find a bad one. If it is a small split in a hose it will only get larger over time. Here is the factory info on the code. We have found that alot of these leaks are from a small hose on the evap canister under the vehicle, but with out looking at your vehicle it is hard to say. If the leak goes away or is no longer large enough to be detected, your light will go out after a few days. These leaks are emmissions related and will not effect the integrity of the vehicle. I would have it checked and corrected if the light stays on at your convienience.

Symptom List:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0442-EVAP LEAK MONITOR
MEDIUM (0.040) LEAK DETECTED.
When Monitored and Set Condition:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: If there is a leak larger than 0.0409 and smaller than 0.0809 in the
evaporative system.
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0809 in the evaporative system.
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0209 and smaller than 0.0409 in the
evaporative system.
POSSIBLE CAUSES
LEAK AT GAS CAP
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
VISUAL AND PHYSICAL INSPECTION
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
EVAP PURGE SOLENOID OPERATION
INTERMITTENT LDP MONITOR FAILURE
EVAPORATIVE EMISSION LEAK DETECTION
GAS CAP
LDP COMPONENT LEAK

i do not understand wat and where is the leak but most of time if there is a leak in the car ,it have to be the heater core that leak water or antifreeze or the pedal for clucthing that leaks brake fluids on the floor the batterie ,...there must be an short in the ignition electrical part try to relpace it