Battery charge can last from 1 day to 3 weeks then goes dead
This has been happening for about a year. When I take it to have the battery tested it has a full charge. the one thing that I have know noticed is that the alarm system needs service and when the alarm goes off by itself, the siren does not sound but the lights flash
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Remove negative cable from battery, connect a test light to negative terminal, opposite end off light to negative battery post. ( let sit for 3 to 5 minutes). Then start pulling fuses, when the light goes out that's your bad circuit. God-Bless! Its worth a try.
This has happened to me TWICE in the past 4 months. I had Lexus road side service come out both times to check the car out. Each time the battery was totally dead. The road side mechanic said that if the car is not driven at least 15 minutes nonstop a day, the battery runs dead as there are so many draws from the car on the battery. If you do alot of stop and start driving like I do, that isn't enough to recharge the cell of the battery, it must be non stop driving time. Recommend that I get a 1.5 tricky charge device an hook to battery at least one night a week to keep the battery charged. This is really frustrating with such a new car. I've spoken to other owners of other model luxury cars and no one has had this problem.
Running so few miles has accelerated the aging of the battery - the battery never had a chance to fully recharge in such small trips - so now you have to replace it a year sooner than usual.
Just replace it.
If this happens while driving, you have a charging system problem. With a multi meter connected to battery(red+ black-) check alternator output, it should be 13v or better.
If it's dead after sitting a spell and your batt. is 4-5 years old, it may be time for a new one.
Also you might have a draw, (somthing stays on) use a 12v test light, disconect 1 batt. terminal and clip 1
end to the terminal and touch the other end to batt.
post. With everything off,(remove bulb on hood) key
in your pocket, see if test light comes on.
If it comes on you have a draw. pull 1 fuse at a time
(remove+replace)until light goes out.When it goes out
the last fuse you pulled is for the circut with the draw.
If you have any aftermarket electronics radio/alarm/ or
remote starter check them 1st.
Also most auto parts stores napa/advance/or autozone will test your battery and alternator free.
Hope this helps. Good luck
Take it to autozone and have them charge the battery up ad test the altanator output voltage and amperage output for free also have them do a load test on the battery, You may need to clean the batteriey cables to. If this does not fix the problem please post here and I will help you some more.
sounds like the battery got run down so far that it wont hold a charge-maybe take the battery out and take it to a parts store that can "load test"the battery-some testers can actually test the battery even if its dead-also when u charge a battery u have to make sure the clamps from the charger make a good connection. i read somewhere that everytime a battery goes dead it shortens the life of the battery-FYI most batteries last from 4-5 years if there are no other problems with the car.hope this points u in the right direction.
A few possibilities..
A battery can test fine and still be bad.. Especially the "no maintenence" batteries that have no cell caps.. I have seen it happen many times.. Car batteries usually last around 3 years..
Could be a bad connection at battery terminal,, Maybe corroded battery cables.. This would cause it to not charge properly..
Could be a drain.. A drain is something drawing power from the battery even when the car if off.. Can be very very hard to find..
After car is off for a few hours - check all the relays and fuses to see if any are warm or hot.. If you find one - that could indicate where the drain is coming from..