Dear Calvin Loh Thanks for contacting us here, Unfortunately we regularly see new batteries that are dead in packets or discharge quickly as soon as used. We usually use and recommend Energisers/GP/Maxell brands in the market to clients as our experience is these last the longest and have nearly always proven to be reliable from new. We recommended to change the sensor battery to new battery OR check the sensor's battery voltage with an ohmmeter/voltmeter if it is available and it should be more than 3v,  Kindly provide us with below details for investigating the issue for ERR issue in your FOBO Tire 2 App by writing an email to ""cx@my-fobo.com" : 1. What is your email account that you logged-in for FOBO Tire 2 App now? (It is available on top of the user's profile page)  2. Send us a screenshot/photo of the tire sensor page/status in FOBO Tire 2 App 3. Send us a log files of your vehicle's profile by going into User's profile page then scroll down and tap “Save and Send Log” button and email to "cx@my-fobo.com" 4. Share with us an invoice copy of your purchase  We look forward to serving you better.  Best Regards Amir Bayati Customer Experience | Salutica Allied Solutions Sdn. Bhd. (a subsidiary of Salutica Berhad) 3 Jalan Zarib 6, Kawasan Perindustrian Zarib, 31500 Lahat, Ipoh, Perak, Malaysia M  +6016 787 3175 | my-fobo.salutica.com.my

I have send the needed to the email given. To be honest, I bought the device June 19, the device comes with the battery provided by your product and I have changed 1 sensor battery few weeks back to a Panasonic 3V battery. Even the AA battery provided didn't last for a month, I have to change it to a rechargeable battery. I only set to a normal frequency rate.