Re: Easy Service Call - Impressive Batteries

[Jim Rojas <jrojas@xxxxxxxxxxxx>]

On 8/7/2015 8:03 PM, NickMark wrote:
> On Wednesday, August 5, 2015 at 7:37:37 PM UTC-4, Bob La Londe wrote:
>> Had a sort of fun service call today.  AC has been out on a fire panel since
>> the 31st.  Customer was notified that day.  Today was the first day they
>> could coordinate to look at it.  The panel has been sending abnormal tests
>> the whole time and started sending low battery signals this morning.
>>
>> Every breaker in the panel for the building was on except the breaker for
>> the fire panel.  It was not tripped it was turned off.  I turned the breaker
>> on, checked voltage on the batteries (22 volts) and waited about five
>> minutes.  Al troubles cleared.  I gotta love those Yuasa batteries.  I think
>> those will pass the 24+5 rule.  LOL.
>>
>>
>>
>>
>>
>>
>>
>> --
>> --
>> Bob La Londe
>> The Security Consultant
>> Licenses ROC103044 & ROC103047
>>
>> *******************************
>> *******************************
>> Side Business:
>> CNC Molds N Stuff
>> www.cncmolds.com
>>
>> Day Job:
>> The Security Consultant
>> www.yumaalarm.com
>>
>> Hobbies:
>> Honesty in Airguns
>> www.allairgunners.com
>>
>> Fishing Arizona and the Colorado River
>> www.YumaBassMan.com
>> ******************************
>> ******************************
>
> Yuasa makes great batterys use them all the time
>

A few months back I started experimenting with Li-Mn batteries on my own
security system.

At the moment I have 2 banks of four 18650 2200ma Li-Mn batteries. It is
roughly a 4AH setup at the moment. So far, no problems whatsoever. I did
have to discharge the batteries down to 3 volts each so the security
system would be able to charge them up to about 13.5 volts. So far, no
problems at all. I still need to fully test backup time though. Since I
am not over stressing the batteries at 3.7-4.2v, they should last a lot
longer, and provide roughly 10 percent less of their overall rated
capacity. This is something you just can't do with SLA batteries.

I plan to add 2 more banks to give me a total of 8AH more or less. The
nice thing about this setup is that it allows me to replace a single bad
cell without tossing out the rest of the batteries. This is something I
always disliked about SLA batteries. Sure I can buy Li-ion or Li-Mn
battery for about $100 each, but then I have the same problem with them
being sealed.

I wouldn't recommend doing this out in the field, but it would be nice
to see these type batteries used for security systems in the future at a
much lower cost. I can see this battery bank lasting 6-8 years without
any real issues.

If all works as planned, I will encase the completed battery bank in a
metal or plastic enclosure to minimize the possibility of a short circuit.

Jim Rojas

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