I've taken over a visonic system, owner has no idea when it was serviced. Which leads me to ask the question, how often should they be changed? (CR123, Bell etc?)

 

I meter the batt and change if below 2.8v but rule of thumb?

2.8/2.7 is the threshold of low battery.

if 2.8 i doubt they wouldlast until next rmv.

2 years for now, although most vis devices will get 3 oor near to 3 years,, not worth the ballache, swap at 2.

thanks bud, I was on the right track!

a volt check means nowt, you never did that on the sla as a good test. Depends on the gear experience will out.

Why i typed now i dont know, i meant me.

on site test for lithium is volts.

means nowt as yu know

Yearly for CR's, 2 years for Bells, here on that kit.

The problem is a litium cell will loose approx 0.5 - 2% of its capacity a year depending on brand. Couple this with the low power draw of wireless devices the curve just drops of completely very quickly.

The difficulty for the manufacturers is at what point do thy report a low battery. Too early and it looks like its running out of batteries, too late and the low battery running time is either very short of non existant.

 

The low voltage volts will depend on the manufacturer and cannot imo be the same for all manufactures.

 

I suppose the answer is to have it programmable so the maintainer can choose when it goes into low battery and how long it will function for in tht state before the supervision failure

 

The problem is a litium cell will loose approx 0.5 - 2% of its capacity a year depending on brand. Couple this with the low power draw of wireless devices the curve just drops of completely very quickly.

The difficulty for the manufacturers is at what point do thy report a low battery. Too early and it looks like its running out of batteries, too late and the low battery running time is either very short of non existant.

 

The low voltage volts will depend on the manufacturer and cannot imo be the same for all manufactures.

 

I suppose the answer is to have it programmable so the maintainer can choose when it goes into low battery and how long it will function for in tht state before the supervision failure

 

cr123.jpg

 

Where did you get the data/graph from JW, is it something I can repost elsewhere?

http://www.powerstream.com/cr123a-tests.htm