About 2 years ago when I replaced the front tire on my 2008 C-14 I decidd to replace the battery in the TPMS even tho it was working fine. I bought three CR2032 batteries off Ebay before that time. I think the old batteries were the original batteries. The front & rear TPMS were both working fine.
About 1 year ago when I replaced the rear tire I did the same with the rear TPMS. Recently I've been seeing a "Rear TPMS Low Battery" message after I first rode the bike, but then it would extinguish and give an accurate rear tire pressure after about 10 minutes or so. I think the TPMS is interrogated every 10 minutes or so by the TPMS/Immobilizer module and not every few seconds. Don't ask me why the problem would clear up after riding the bike for awhile. This repeats every time I restart the bike during the day.
So I removed the rear wheel today and broke down the tire from the bead and removed the TPMS and checked the battery voltage. It was only about 1.4 volts. Don't know why it failed early. What is interesting is that the TPMS sensor would work at all with this low voltage.
I looked up the specs on the CR2032 battery and it looks like the capacity ( about 240mAH ) is measured until the terminal voltage gets down to 2 volts so maybe the TPMS are designed to work on a voltage of 2 volts and maybe even lower even tho the CR2032 is described as a 3 volt battery.
The test current to measure the capacity is only about 0.2 mA and the time to reach 2 volts is less than 1,000 hours. I think the TPMS only works while interrogated because that would be the only way a battery would last several years. And maybe there is a device ( accelerometer ? ) insde the sensors that turns the circuitry on only when the bike is moving.
The third battery I bought before I replaced the front TPMS battery is reading 3.3 volts. But I didn't trust this battery I bought years ago, so I bought another 4 from a different supplier recently and installed one of these today in the rear TPMS. Now to find out how long these last before I start seeing a Low Battery Messages again.
I'm just happy I don't have a newer C-14 with the potted TPMS that you can't replace the batteries.
EDIT : I watched a YoiuTube video last night where a guy replaced the battery in a car TPMS that was potted with what looked like a soft silicone sealer. If the later generation C-14 are potted like this, the batteries should be replacable also. But if an epoxy type potting is used, probably not. But even then it would be worth a try.
Anyone familiar with the potting used in the newer C-14's ?
About 1 year ago when I replaced the rear tire I did the same with the rear TPMS. Recently I've been seeing a "Rear TPMS Low Battery" message after I first rode the bike, but then it would extinguish and give an accurate rear tire pressure after about 10 minutes or so. I think the TPMS is interrogated every 10 minutes or so by the TPMS/Immobilizer module and not every few seconds. Don't ask me why the problem would clear up after riding the bike for awhile. This repeats every time I restart the bike during the day.
So I removed the rear wheel today and broke down the tire from the bead and removed the TPMS and checked the battery voltage. It was only about 1.4 volts. Don't know why it failed early. What is interesting is that the TPMS sensor would work at all with this low voltage.
I looked up the specs on the CR2032 battery and it looks like the capacity ( about 240mAH ) is measured until the terminal voltage gets down to 2 volts so maybe the TPMS are designed to work on a voltage of 2 volts and maybe even lower even tho the CR2032 is described as a 3 volt battery.
The test current to measure the capacity is only about 0.2 mA and the time to reach 2 volts is less than 1,000 hours. I think the TPMS only works while interrogated because that would be the only way a battery would last several years. And maybe there is a device ( accelerometer ? ) insde the sensors that turns the circuitry on only when the bike is moving.
The third battery I bought before I replaced the front TPMS battery is reading 3.3 volts. But I didn't trust this battery I bought years ago, so I bought another 4 from a different supplier recently and installed one of these today in the rear TPMS. Now to find out how long these last before I start seeing a Low Battery Messages again.
I'm just happy I don't have a newer C-14 with the potted TPMS that you can't replace the batteries.
EDIT : I watched a YoiuTube video last night where a guy replaced the battery in a car TPMS that was potted with what looked like a soft silicone sealer. If the later generation C-14 are potted like this, the batteries should be replacable also. But if an epoxy type potting is used, probably not. But even then it would be worth a try.
Anyone familiar with the potting used in the newer C-14's ?
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