Re: Easy Service Call - Impressive Batteries

[Jim <alarminex@xxxxxxx>]

On Friday, August 7, 2015 at 9:13:33 PM UTC-4, Jim Rojas wrote:


Hi Jim

How do they compare in size to the standard 4 and 7AH SLA batteries?

And do they accept the same float charge and charge rate provided by alarm panels?




> 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
>
> --- news://freenews.netfront.net/ - complaints: news@xxxxxxxxxxxx ---