Re: Unusual Challenge

[ABLE1 <somewhere@xxxxxxxxxxx>]

On 1/12/2022 11:29 PM, RTS wrote:
> On 1/12/2022 9:12 PM, John R. Sowden wrote:
>> Could you please advise how you got a 60% reading on a cr2032 lithium
>> battery.  When I replace a battery on a wireless job, it was my
>> understanding that there is no test for a life of a lithiom battery.
>>
>> John Sowden
>> American Aentry
>> SF Bay Area
>> jsowden@xxxxxxxxxxxxxxxxxx
>>
>> On 10/20/21 5:31 PM, ABLE1 wrote:
>>> Hey Guys,
>>>
>>> Would like some thoughts on the following challenge.
>>>
>>> Customer has a showroom/office in one building and the shop in another
>>> that is 70 feet away.  They wanted to have a way to get notified in the
>>> shop that a potential customer came into the showroom.
>>>
>>> What I installed was a door contact switch on the entry door and wired
>>> a Linear DXT-31 transmitter and a Linear DXT-701 Receiver in the shop.
>>>
>>> Â From there I used the contacts on the receiver to trigger and Altronix
>>> timer and the contacts there to trigger a horn/buzzer for about 1
>>> sec. when the door was opened.
>>>
>>> It has worked quite well for some time but, recently I was told that
>>> it did not respond to ALL entering the showroom.
>>>
>>> I was there a couple of weeks ago and it was working but the the CR2032
>>> batteries were about 60% level and I changed to new.  Tested the
>>> batteries were at 100%. OK.
>>>
>>> I was then informed yesterday that it was still missing some entries.
>>>
>>> I stopped in today and first I tested the door 3 times and it did not
>>> work.
>>>
>>> I tested the batteries.  They were at 100%
>>>
>>> I removed the transmitter and went to the shop and it worked 5 times
>>> in a row.  Or let's say 100%  I put the transmitter back in the attic
>>> above the showroom where it was but staff was in a meeting so I could
>>> not test.
>>>
>>> Was told later that they tried it and it did not work a total of 3 times
>>>
>>> Now the receiver has a wire about 7" long as a antenna.  I have
>>> it hanging over the edge of a window so that the walls would not block
>>> the RF signal. The Transmitter is in the attic space on a vertical
>>> 2x4.  The only thing that might block the signal would be the plywood
>>> and asphalt shingles on the roof, 70' of distance, bug screen and
>>> glass window.
>>>
>>> Needless to say this is a intermittent problem that is NOW not working!!
>>>
>>> So, any thoughts on this before I type something that really made a
>>> difference this afternoon.
>>>
>>> Thanks for any thoughts!!
>>>
>>> Les
>>
> Whenever I have a need to check the current status of a battery,
> I use a static resistance load..
> First you need the discharge rate sheet from the manufacture.
> Then a meter to read the static voltage on the cell
> Second another meter to read the current from battery to load
> Third a rated load (resistor) I use different resistors to make up
> the discharge current as listed on the manufacturers discharge sheet.
> (take care to use a high enough wattage rating on your resistor)
>
> Then just add the load to the battery and monitor the discharge
> rates on the meters..
> Compare your reading with the manufacturers sheet..  ;-)
>
> you can do the same thing using the device as the load..
> giving you a better idea of battery life expectancy ...
>
> Isn't that fun.. ?
> RTS

Then again you could get one of these and test the battery much easier.
ZTS MBT-1 Pulse Load Battery Tester
Search on eBay!!  $95.00

Have fun!!

Les