Perhaps becoming somewhat paranoid about the charge state of the 12 V. battery in my Toyota CH-R Hybrid, I found this battery monitor:
Bluetooth Battery MonitorThe unit manual is available here
Documents for anyone wishing to browse the spec's..
Note, for anyone contemplating purchase, there are a number of different brandings and price variations for what certainly appears to be the same device, the link supplied was the best price listing and is branded "
Quicklynks".
Played around with the unit on the bench using a variable voltage PSU and an accurate Fluke DMM, established that the current consumption was indeed marginally greater than 1 ma. and the voltage indication as displayed on the Android phone app. was surprisingly accurate, no greater than 0.02 V. variation to the Fluke DMM.
Simulated the "crank" and "charge" tests with the PSU, both worked fully to spec..
Obviously the "crank" test will be hypothetical on my hybrid as the 12 V. battery does not actually crank the engine.
The short term (5 mins.) and long term voltage recording appeared to be working fully to spec..
Fitted the unit on the car this morning, only took a few minutes, ty-wrapped module to battery handle.
Would have liked an in line fuse, not supplied, will probably add one later, just in case!
Started off monitoring with a short charge run, "ready" mode on a hybrid with engine quite quickly kicking in, normal charge voltage with "charging" indication displayed.
Normal charging continued after the engine stopped as would be expected via the DC-DC converter from the HV battery as long as vehicle "ready" mode was maintained.
On "switching off" vehicle, was surprised at the fairly rapid rate of discharge down to approx. 12.44 V. (deemed to be 80% charge).
Use of the "auxiliary" mode (commonly used to enable radio) considerably accelerated the battery decay rate.
2 hours after initial testing with vehicle stopped and locked, battery voltage has decayed to approx. 12.30 V. (deemed to be 65 to 70% charge).
I do have a dash cam fitted but the "shock sensor" is disabled so produces no battery drain when idle.
Bluetooth range is more or less to expectation, can't access the monitor from house with vehicle in normal location, adjacent detached, closed garage.
Access around and within the vehicle is adequate and to expectation.
Early days, but very impressed with the capabilities of the monitor and the associated phone app., hope to establish if my 12 V. battery is below spec. and produce evidence should this be the case which should help with any negotation for a warranty replacement if I feel I have to go down that route.
I now have my Noco GB40 Lithium Ion battery jump pack on hand and fully charged which I intend to keep in the car at all times just in case!
Edit: Typo correction.