FOBO tire pressure monitoring system report..

[peterbaron]

Not that I have a cure, ready answer for your problem or I question previous pre-diag by more experienced fellas in this matter...but a few things to consider:
* cheap or poorly design products usually draw more current or normality in your case
* your FOBOs constant communication with your cell means: slow and continuous discharge
* simply said: when the ambient temperature drops , the battery is able to last longer. When the temperature increases, the battery life shortens. I think, California climate delivers these two extremes almost daily, correct?
* before installing a new battery, check its voltage, as well when discarding it
* battery lifespan depends on its quality/manufacture + some other factors
* general rule is: if you buy 2 cheap, you pay twice for it = overpaid vs 1x good quality + no headache

** your FOBOs and batteries are constantly facing centrifugal force, spinning, shaky/twisty roads, brake pads dust falling on them, pistachio load/smell....so no wonder these wander, get brain damage and die prematurely