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Old 08-15-2010, 08:12 AM   #1 (permalink)
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Just picked up my new limited yesterday.
I asked sales person about battery life in the smart key.
He seemed to know the Sonata very well and he informed me that the smart key had a rechargable battery.
To charge the battery just insert the key into the slot in the center console and drive.
Is he blowing smoke or is this something new?
Nothing in the manual about recharging.
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Old 08-15-2010, 08:41 AM   #2 (permalink)
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Salesman is wrong

The center console slot is indeed for when your battery on the FOB is low. But it's so you can still start the car. It does not recharge.
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Old 08-15-2010, 11:05 AM   #3 (permalink)
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..
When WE picked up our car the salesman told us the same thing, But, midas 69 is correct. The fob battery should have a normal life span of at least a year or a little more.
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Old 08-15-2010, 11:53 AM   #4 (permalink)
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Yes so try to use your door handle more often. I hardly ever use the key fob.
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Old 08-15-2010, 02:05 PM   #5 (permalink)
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QUOTE (ssmuff @ Aug 15 2010, 10:53 AM)
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Yes so try to use your door handle more often. I hardly ever use the key fob.
The problem is, unlike a normal key fob, this one is always transmitting. My last car, 2007 Camry, also had the smart key. I almost never used the fob. Occasionally I'd hit the button in case I might have forgotten to lock the door as I walked away. But by and large it never left my pocket. Still had to replace the battery on both fobs within the 3 years I had the car.

Prior to the smart key, I'd never kept a car long enough to need to replace the battery in a key fob. Now I'm thinking of playing it safe and just doing it every year whether it's needed or not.
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Old 08-15-2010, 04:56 PM   #6 (permalink)
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You are correct about the constant transmission.
The manual says the batteries are good for several years?????
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Old 08-16-2010, 06:02 AM   #7 (permalink)
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I've had an EZPass (automated toll tag) which works on the same principle, RFID. It has been working fine for about 6 full years now with no dead battery, so I think they have the technology worked out. The car transmits a signal which activates the FOB to send one back if it's within range, I don't think it transmits all the time.
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Old 08-16-2010, 07:23 AM   #8 (permalink)
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The slot is just a reader.
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Old 08-16-2010, 08:36 AM   #9 (permalink)
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QUOTE (Syitalian25 @ Aug 16 2010, 06:02 AM)
Quote:
... I don't think it transmits all the time.
whether it is transmitting or receiving - it is "on" all of the time.
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Old 08-16-2010, 01:38 PM   #10 (permalink)
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i heard it's about 10 years on the battery. i haven't tested the thing for 10 years, so i'm not sure :-p. depending on how much you use the key can determine how long it lasts. i had remotes that have never had a battery change (10 years) but those were the push a button to open and lock and stuff. no button start.

the ezpass i have is about 4 years old and going strong. i don't even know if there is a battery to even change in there, or how to do it w/o ripping the casing completely apart.

as for the center slot... the dealer said it would "recharge" the battery, but meh. idk. it looks easy enough to just pop open and replace a dead battery.

now will it have to be reprogrammed after a new battery?
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