Re: Easy Service Call - Impressive Batteries

[Jim Rojas <jrojas@xxxxxxxxxxxx>]

On 8/7/2015 11:44 PM, Jim wrote:
> 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 ---
>

They are half the size and roughly 1/4 of the weight.

I haven't done extensive testing yet, but they do not show any sign of
not accepting a float charge.

Jim Rojas


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