Battery and charging issues - info
we are using many of your MetaMotionR in our prototypes.
In total about 150 sensors.
FW version = 1.4.4
HW version = 0.3
We are facing 2 main HW issues:
1) Dead battery in about 15 sensors (previously working correctly).
The usb charger works correctly: 5V in 5V pin, 3V in 3V pin and about 4V in BAT pin, when charging.
The BLE connection to your Metabase App works correctly.
However once unplugged from usb-charger, the connection is lost and the battery runs out of charge quite immediately (voltage BAT vs GND = 0V).
Another point: in the same instant the plug is connected to the micro-usb of the sensor, the LED blinks (red-green-blue) ,
exactly in the same way described in the hard reset procedure (shorting of pwr and grd pins)
From a visual inspection of these batteries, there is not evident difference between them and the batteries of sensors working correctly.
2) In other 3 sensors (previously working correctly).
The usb charger works correctly: 5V in 5V pin, about 4V in BAT pin, when charging. However on the 3V pin, the voltage level measured is lower (between 1.5-2.5V) than expected (3V).
For these sensors, it was not possible to set a BLE connection, even through the Metabase App (the sensors are not visible during the BLE scanning).
Do you have any ideas/suggestions about the actions to do in order to fix these problems (or to prevent them)?
Another question. How long can we keep the sensors plugged to the usb-charger?
I mean, can we keep the sensors continously in a "recharging" status?
(e.g. they are plugged and charged, then they are unplugged and used for 30 min, and then they are plugged to the recharger again and keep in a charging status.
This operation repeated many times (years) )
Is the MetamotionR provided with a circuit able to monitor the level of the charging battery and avoid failure of the battery in a similar operation condition?