Just sent an e-mal to James asking about FOBO sensor battery life and the app battery gauge (1 to 4 bars). His reply:
To cut a long story short; lithium ion is better than alkaline battery, but it will hold a very narrow voltage, in this case 3.2v to 2.7v, after which it will fail to drive the electronics, and the sensor will stop working. Some customers were surprised why it was showing 3 bars the day before and the same battery got konked out the next day. To overcome this, we recalibrate the indicator to reflect its performance voltage and not its overall voltage of 0-3.2v! A 4 bars will denote 3.2v and above, which will be a Perfectly good battery, a 3 bars will be 3.0-3.2v, and so on. Hence a 3 bars is still an above average battery and it should last you for many months without excessive user behaviors. A new battery from the store may not be above 3.2v depending on how long it has left the factory or sitting in the store, so you need to anticipate some losses due to that. 100 deg F is not an issue for sure, but 140 degF may start to cause deterioration and also -20deg C downward will do the same, and I do hope you don't have such cold winter!
Last but not least- if any battery is draining out, say less than 3 months, it's not acceptable (again assuming no excessive user behavior), you need to report back to us, and we will be happy to provide a replacement warranty. Just to define excessive behavior- it's releasing, re-pairing, excessive rotation, excessive temp exposure, ignoring alert continuously, removing and re screwing sensor excessively, etc, things like these will consume battery, which is quite normal.
Hope this clarifies, and you could continue using your Fobo products at ease.
