Left my key in the ignition 06
Boxster
and
battery
completly dead discovered about 2 days later.
Battery
is a USA Interstate only 2 years old and it started car good before drained so I think it just needs to be charged up if I can open the front lid to do.
I tried this unsuccessfully several times. A person who has a
Porsche
service business says this will work, just need a good +, - connections so I plan on trying this again today
I initially tried to revive the
battery
using
Porsche
500ma tender in the cig lighter. I know now this small amp will not begin to revive a totally dead
battery
.
I have a 2 amp cig lighter charger I have being shipped that I hope will be enough kick to revive. But:
My
Porsche
independent service guy also says do not try and charge the
battery
through the cig lighter.Possible ruin computer issues. He also says once the lid is open using the fusebox terminal circuit remove the
battery
to check out and charge. He says the low voltage the computer will see initally could screw up the computer if trying to charge in place.
I have read of other people using 2 amp cig lighter charger and then jump cable charging in place once lid is opened and there were no computer issues. They might have been Caymens but I'm assuming about same electrical circuitry.
So is there a issue using a 2 amp charger connected to the cig lighter to charge a good
battery
that has been drained totally dead because of the stupidity of its owner? Like it may work and then again might cause expensive damage.If that is the case then I will of course not try.
am the original post guy. problem solved. The door latch is not a good ground where the manual tells you to put it. I went to the door hindges area and attached the ground there and it opened immediately using the positive fuse box terminal. Now charging the 2 year old Interstate megatron plus in place but with the terminals disconnected from the car electrical as recommended by a Porsche guy.
The key in the ignition powers up all the computers in the car so will kill any
battery
in a day or two.
Charging a dead
battery
with the cables disconnect is always best practice though I've gotten away with not doing it in a pinch. No idea about the cig lighter route.
You should also have a bit of ventilation in the area. The gas given off when charging is hydrogen. Not a huge issue just make sure there's somewhere for the gas to escape.
Also should check electrolyte level if possible.
And not what you want to hear but this kind of thing can sometimes kill a
battery
beyond recovery.
I predict that you will probably be able to use it again once it is fully recharged, assuming it is only a couple of years old, and no bad or dry cells. You could always get it tested (generally for free) at a place that sells batteries (e.g. Interstate, Autozone, Sears, etc).
Note that some "smart chargers" or
battery
maintainers may not be able to charge a fully discharged (or dead)
battery
- you will generally know because its indicator lights won't go from the testing mode to charging mode.
Let us know how it turns out . . .
Greywolf:
The batteries for
Caymans
and Boxsters should be the vented kind with a little hose that goes down and out of the bottom of the car. This is to prevent corrosion in there and to vent said hydrogen gas build-up. Only place it can build up is in this little hose, not in the frunk...IF you always replace your
battery
with the hose-vented variety from Interstate and others. It's a little fitting on the side of the
battery
and a hose fits on it.
:cheers:
