RE: Cache Battery question

Having watched this thread (I'm the original OP),
I'm of mind to believe that the battery I got was at
less than an optimal charge and that it probably
had sat on shelf for some period of time.  I would
think that what I'm experiencing, for the second time,
is a perfectly good battery in a perfectly good controller
(573D) but just isn't keeping up with the "trickle" as 
suggested because it wasn't fully or optimally charged
to begin with. 
I think, as suggested, you get what you pay for.  If it lives
for a year, that's okay.  The idea that one might get 3 years
on a cheap 2000mAh may be wishful thinking. 

This is still a very interesting, informative thread.  Thanks. 

Bill




From:   "Jim Oberholtzer" <midrangel@xxxxxxxxxxxxxxxxx>
To:     "'Midrange Systems Technical Discussion'" 
<midrange-l@xxxxxxxxxxxx>
Date:   05/18/2015 02:22 PM
Subject:        RE: Cache Battery question
Sent by:        "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>



If you have maintenance on the system (even from the third party guys)
changing the batteries is baked into the price so why do you really care 
how
much the batteries are or how long they have a shelf life for?  They get
swapped every three years anyway.

The batteries are so expensive for two reasons; first transporting them 
has
become a real headache since they cannot be shipped by Air with any charge
at all.  (Technically you're not even allowed to have a second battery for
your laptop/phone with you on the airplane, yea everyone ignores that 
one.)
Secondly these batteries are very expensive to dispose of so that has to 
be
taken into account. 

Aside from the mystery about the OP battery degradation (I suspect a bad
controller card) there's not much point to trying to determine how fast 
the
batteries charge or decay.  Besides, IBM already knows all of that.  Why 
do
you think they put a shelf life on them?
--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Holger Scherer
Sent: Monday, May 18, 2015 2:07 PM
To: Midrange Systems Technical Discussion
Subject: Re: Cache Battery question

That is a great idea so we can get some clarification. If i find some 
spare
time (puh...) i will go on with some older controllers and put in some
measure cables to see what will happen. As there is not often the chance 
to
see the behaviour after an outage, we will simulate this...

At least the modern batteries starting with the power6 boxes are rather
expensive and have a date after which they should not be used any longer.
This date is current timestamp + 3 years if i remember correctly, 
something
like this. Would be strange if (under controlled charging environment) IBM
do not trust their 250$ batteries only for 3 yrs..

-h


Am 18.05.15 um 18:09 schrieb DrFranken:
> I have asked people who know these things for further clarification. I 
> will pass it along as it becomes available.
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