TPMS battery replacement question
Thread Starter
Instructor
Joined: Feb 2007
Posts: 204
Likes: 1
From: Crestwood KY
TPMS battery replacement question
I'm in the process of putting new batteries in 4 TPMS's.
The batteries are the Renota 2477N's, same as OEM.
The batteries measure 3.25 volts before install. After I put them in, the voltage instantly drops to 1.2 volts. I let on sit all night on bench, and this morning it measured .8 volts?
I figured the 1.2 volts was when the sensor was transmitting, but shouldn't it shut off at some point, and return to 3 volts?
I just want to make sure these are right before putting the silicone on them.
TIA
The batteries are the Renota 2477N's, same as OEM.
The batteries measure 3.25 volts before install. After I put them in, the voltage instantly drops to 1.2 volts. I let on sit all night on bench, and this morning it measured .8 volts?
I figured the 1.2 volts was when the sensor was transmitting, but shouldn't it shut off at some point, and return to 3 volts?
I just want to make sure these are right before putting the silicone on them.
TIA
Thread Starter
Instructor
Joined: Feb 2007
Posts: 204
Likes: 1
From: Crestwood KY
I just checked all 4 on bench, with different batteries, and they all drop to 1.2 volts when batt is put in and leads connected.
The sensors worked before, so I don't think all 4 would be bad.
I'm gonna try to train one tomorrow and see if it will connect and how long it lasts!
The sensors worked before, so I don't think all 4 would be bad.
I'm gonna try to train one tomorrow and see if it will connect and how long it lasts!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Where did you purchase your batteries from?
My wife purchased some portable phone rechargable batteries form an ON LINE SUPPLIER. They worked for about 2 weeks.
I purchased some different replacement batteries (singel sell, solderable together) from a known good dealer. The rechargable batteries have been working OUTSTANGING for months.
You could have bad batteries.
When the wheel is NOT rotating, the transmitter, should NOT be working and NOT drawing current. Put a DC Current meter MILLIAMP METER) between the NEG lead and the NEG sensor battery terminal and see if the device is drawing current all the time. It shouldnt!!!!!!!!!!
Bill
BC
My wife purchased some portable phone rechargable batteries form an ON LINE SUPPLIER. They worked for about 2 weeks.
I purchased some different replacement batteries (singel sell, solderable together) from a known good dealer. The rechargable batteries have been working OUTSTANGING for months.
You could have bad batteries.
When the wheel is NOT rotating, the transmitter, should NOT be working and NOT drawing current. Put a DC Current meter MILLIAMP METER) between the NEG lead and the NEG sensor battery terminal and see if the device is drawing current all the time. It shouldnt!!!!!!!!!!
Bill
BC
Last edited by Bill Curlee; Dec 27, 2014 at 09:26 PM.
Thread Starter
Instructor
Joined: Feb 2007
Posts: 204
Likes: 1
From: Crestwood KY
Thanks for the reply.
I forgot where I bought them, but was online.
I did show the sensors around putting the batts in, that would activate them, correct?
I'll check the MA and see what's going on.
I forgot where I bought them, but was online.
I did show the sensors around putting the batts in, that would activate them, correct?
I'll check the MA and see what's going on.
Racer
Joined: Feb 2004
Posts: 359
Likes: 7
From: St. Paul MN
You can force them to transmit by placing a strong magnet near the base of the valve stem. This is also how you train them when inside the wheel rim. I've tested TPMS using O'Reilly's keyfob tester this way to visually confirm they are transmitting something.
Todd
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
you can test the transmission function but you cant test the pressure function. IN my opinion. its not worth all that effort to try to replace the batteries and run the risk of a failed circuit board that can only be tested after they are installed and rotating up to speed.
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Tech Contributor
Joined: May 2008
Posts: 3,100
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
2477N Lithium batteries are rated at 3 volts DC output. Something is definitely wrong if the voltage is dropping to 1.2 volts under load. Either the batteries are all weak, or a component in the TPMS circuit board was damaged during the battery replacement causing an excessive current load.
Team Owner
Joined: Mar 2001
Posts: 21,325
Likes: 3,841
From: small town in S.E Pa. PA
St. Jude Donor '03-'04
Over my years here, several members tried to make a home business out of replacing these batteries. Of the three people I know who made a go of this, none of them lasted more than a year. reason... too many failures, too much effort and grief for the return.