On Thursday, 26 September 2019 13:00:32 UTC+1, JGD wrote:
If anyone's following this thread and getting confused about battery
types, let me try to clarify:

The standard CR123 lithium batteries used in the VP2 wireless
transmitters are _not_ designed to be rechargeable.

However, if you look on eBay and the like you will find some batteries
that are the same form factor as CR123 but which use a different lithium
chemistry & design and which are rechargeable. In fact there seem to be
multiple types of rechargeable CR123 that deliver different voltages
(presumably using different chemistries) ranging from 3.0 to 3.7v.

Davis recommend not using these rechargeable types because their voltage
characteristics are different from standard CR123 and so they won't
necessarily trigger the low voltage warning correctly. Also the
rechargeable types tend to have only 30-50% of the capacity of the
standard types and therefore will need to be changed out more often.

There's also some suggestion that the rechargeable type is less
reliable. Here's some commentary online about the issues (in the context
of CR123 as a torch battery, but behaviour will be the same in other
applications):

================================================== ======
Why we stopped selling rechargeable CR123A batteries:

There are various reasons why we no longer sell rechargeable CR123A
batteries.

Firstly, the many problems we had with those batteries. They range from
overheating batteries, defect batteries to leaking and even a few
exploding batteries.

We are not the only ones to have those problems. Read the forums...

The background of that problem is that the leading manufacturers of
Lithium-Ion accumulators, like Sanyo and Panasonic, do not produce cells
in a format suitable for the production of a RCR123A accumulator. The
accumulators used for RCR123A batteries are therefore of a lesser quality..

The 2nd reason is that the capacity and the so-called C-rating* of the
rechargeable CR123A accumulators fall short of the powerful torches that
are currently produced. The low capacity provides disappointing life.
And the too low C-rating generates overload of the accumulators with
high heat as a result.
================================================== ======

Now I'm slightly confused...

Just noticed the Temperature & Humidity had again started displaying --.- & --% and this time in the bottom RH corner of the console it was displaying a 'L'.

Note: the other day the battery on my 2nd temperature sensor died and the display was reading 'Battery Low...' along the bottom line of the console, I guess it can't also read 'L'. as well possibly?

So I have just replaced the battery in the ISS come back in and everything now displaying correctly, the bottom RH is displaying the usual 'X' slowly on and off.

Yet, just checked the charge on the battery I have taken out and it is charged. I know this because I then checked with the battery I took out of the 2nd temerpature sensor yesterday and it registered nothing. Maybe, the battery I took out of the ISS was not quite housed in properly, or there was some dirt between the contact, although it looked clean.

A mystery.

Keith (Southend)

On Tuesday, 24 September 2019 18:22:44 UTC+1, Keith Harris wrote:
I keep getting the temperature and humidity readings failing ---- etc, when I get this for my 2nd thermometer it stays like this but the message 'Low battery on station 2' displays. It's intermittent and can be either day or night and goes like this for 45 mintes or so. My hunch is, could it be the battery in the outside unit on it's way out.

Before I change it just thougt I'd ask the question.

Keith (Southend)

The reason the console displays ---- C and -- % is the battery on the weather station is flat. The console warns "Low battery on Station 1 " but the console will still be recording temperature and humidity. If the battery is not changed after a week the console will stop recording temperature and humidity. Last October, I had not seen the warning initally and it came up again and then the readings went blank. After I changed the battery, the readings came back. In August, I noticed the warning and changed the battery on the same day so the readings did not disappear.

Nicholas
Meir Heath, Stoke-On-Trent.

On 26/09/2019 21:33, Keith Harris wrote:

Now I'm slightly confused...

Just noticed the Temperature & Humidity had again started displaying --.- & --% and this time in the bottom RH corner of the console it was displaying a 'L'.

Note: the other day the battery on my 2nd temperature sensor died and the display was reading 'Battery Low...' along the bottom line of the console, I guess it can't also read 'L'. as well possibly?

So I have just replaced the battery in the ISS come back in and everything now displaying correctly, the bottom RH is displaying the usual 'X' slowly on and off.

Yet, just checked the charge on the battery I have taken out and it is charged. I know this because I then checked with the battery I took out of the 2nd temerpature sensor yesterday and it registered nothing. Maybe, the battery I took out of the ISS was not quite housed in properly, or there was some dirt between the contact, although it looked clean.

A mystery.

Keith (Southend)



L means signal 'L'ost. I had this intermittently with my setup a year
or so ago. The solution for me was to reboot the console (it had been
running non-stop for years since it is mains powered with battery backup).


--
Brian Wakem