How to boost the battery of a phantom 2008, it's possible to go inside the car, but the battery's dead, can i do boost by front if i open the hood, or can i open the trunk by somewhere

parked? key off drain? your question is not clear, and zero evidence presented.

but I toss my power drain coin and land>?

we call that phantom drain, (or dark currents)

well gee vast ways , for sure.

even a bad battery or alternator dead, and not tested first

yes bad batteries sure can for sure self drain even sitting on a bench they can, FACTS. (alternator dead or it too can leak and drain any battery dead.)(leaks means ******* current drain leaks)



but... not that we....

ok using and ammeter we see drain over 0.050amps, (bad)

50mA max, more is bad for sure 1000mA, (a lamp on)

I use amp clamp meter on Plus battery lug.

then if the fails key off and no lamps seen glowing in the dark of night.

we pull fuses 1 by 1 to find the tree branch of power feeds that is bad.

all techs know how to find this.

one the exact wire feed that is failing is discovered we pull all devices on the color coded feed, using the SERVICE MANUUAL

That battery charger is not any kind of battery tester, it can not say by its self good or bad battery. ever.
only load testers can or the below. (cranking tests)

it my get correct battery is low and needs to be charged
the charge can be used (good ones) force to charge the battery a 15amp charger is best, (2 hour can cure this)
after the battery is force charged or jump cable jump charged, the stater motor nmnow starts the engine
this act takes, 100 to 300 amps of current flow, and proves batter is both good and bad, or load test the battery in any
autostore.
do not leave cell phones connected when car is not running or soon.
the charge ports on my car , one is hot full time key off, so never leave things on any hot all the time power port.
next up is BCM games (facts of life) and worse now with 10 computer in cars.

The BCM brain the body brain , will go crazy when the battery does drain low (or battery bad) at near 10vdc
some electronics go dead or random. acts of crazy
all computers do that, as there, regulators chips go offline or bounce at the threshold of power loss,(weAk)
all computers (processors and micro controllers do that ) bad power DC.

test 1: is charge battery first fully, and start engine
battery voltage (a dmm meter) reads 13v to 15vdc, lower volts is bad alternator (or its 3 fuses blown) one of them.

test 2, for phantom drains test short version ask for 10- page versions.

KEY off, battery fully charged use a real battery charger, 15amps is good and forced to charge.
ammeter clamped to the battery PLUS lug wire large (a tool)
current flow key off spec max is 0.050amps (50mA) or less. over is called a phantom drain, (or current)
ok it fails
in the dark (totally) find lamps stuck on in the car ,every where. even under hood lamps ,glove box. etc.
the silly cell phone, uses 1 amp to charged 1000mA, and is 20 times over spec , key off so remove he silly phone.
cured? (a shocking discovery , LOL)
NO !
same ammeter showing the current way too high key off
NEXT:
pull fuses , 1 by1 , one out, see no drop, fuse back , next fuse. find the fuse that causes huge drop in current.

this finds the branch of the wiring tree that is overloaded.
most times this finds the path that is draining. (some alternators do this and fuse to it can not be found easy)

to go to the end run, ask, ( all electric tech know this process)
ask.

give me a example of a reemdem code

Put a test light on the negative battery cable with it unhooked from the battery touch the test light tester side to the negative terminal on the battery .. the test light will illuminate now start pulling fuses .. the test light will dim as u remove the drain ... check and see witch fuse dims the light the most .. check that circuit... its running your battery down

You don't discuss that over the internet for
obvious reasons

Put a battery charger on the starter & charge the battery

Dead battery

Dangerous practice to try & jump a dead battery

The battery cables could be loose at either end or corroded internally

Most likely the battery is worn out, if original to car
since it was new, or the starter solenoid is worn

You do not want to jump any vehicle made after the
year 2000 or your asking for possible problems with
todays electronics.

You need a good battery that has been tested & fully
charged, then only jump with a jump pack,not another car

You should not be boosting what may be a dead battery

That is an unsafe practice

Have battery tested & or replaced,then remove inspect
& clean both ends of cables

If it just clicks then with new battery you have a bad starter
solenoid

remove grille and move latch to open hood-boost battery and use key fob to enter or have locksmith or service station use a slim jim or other type of device to unlock door

note that you never once said car can be driven? why?
job1, can you do job 1?
battery is going dead
if head lamps are dim its battery going dead, (not dash HEADs?)
notice is did not say battery was bad only discharged.

if engine starts is charge.battery lamp glowing.
i engine is dead, can crank it.
get a jump, call AAATOW
or find a loaned battery that is charged.
buy a battery charger and use it.

also cars can have phantom drains, as you sleep battery goes dead. (ask)

why open hood? the battery is not there. look under the back seat,lift up back seat, you should see battery cables there. just like a mercedes, try old style boost or remove battery and replac with new,are you sure the belts are on? check to make sure, ok? thank you for choosing fixya,com