Dear Sir/Madam Thank you for contacting FOBO and we are sorry for any inconvenience caused, IF the sensor is draining battery after 1-2 years, probably has hit physically and hardware damaged, Please note, Battery life span up to 1 year is an estimate based on normal use at 23 C. Battery life span will change due to the following reasons: 1) Frequent change of pressure threshold setting in the App. 2) Disabling & enabling of sensors. 3) Release & pairing. 4) Removal & screw-on of sensors. 5) Operating under extreme cold/hot temperature. 6) Testing of products. 7) Rotation. 8) Trigger alert or let activated alerts unattended. 9) Multiple removal and screw-on of sensors for equalizing all tire pressures. All these activities will drain a battery very fast and affect the battery life span. - Although 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 replace battery and if the sensor have drained battery quickly again then send the log-file to us for investigating by going to App general setting page and click on "Save and Send LOG" , ( How to replace battery video : https://www.youtube.com/watch?v=Zu_gp8oirfA ) We look forward to serving you better.  Best Regards Amir Bayati FOBO Support Team

Thank you for the feed back. The sensor started draining battery after 1 year with first battery replacement. It is on a rear tire an a bike with saddlebags so it is relatively well protected and not removed often. I will try to send log file.