Battery mystery [RE-wrenches]

[Graham Owen]

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Allan,

One thing I have learned to do is deep cycle batteries 10-15 times
before installing them, especially batteries that will most likely never
be deep cycled in the future, such those for starting generators.   I
don’t fully understand the chemistry to explain why this is true but I
recall learning somewhere that batteries will last longer if deep cycled
more than 10% regularly as opposed to less than 10%.  Maybe deep cycling
your battery a dozen times before installing it will help and perhaps a
smaller battery will last longer than a larger model.

Dos centavos,

Graham




Fellow Wrenches,
This seems minor, but I lack a clear answer...

In December we replaced the 12V starting battery on a Kohler 8.5RMY
generator for a BU-only PP-SW5548/D system we maintain. The gennie is
set to exercise once every week or two. The 8.5 has simple controls,
rather than the gauges and all of the large units; I have measured 0 mA
draw on standby
(off) mode. We have a 1.5W trickle module keeping this battery charged,
that we purchased from AEE.

The problem is that the client called me recently to report no starting.
On visit, the generator battery's voltage was too low. The charge module
was showing expected voltage and current.

I pulled the battery and hope that I can replace it under warranty at
the auto parts store where I purchased it. It could be a bad battery,
but I suspect not. The only other cause I can imagine is that the
trickle module either lacks a blocking diode or it has failed, and it is
slowly draining the battery at night.

Has anyone seen this? Any other ideas?

Thanks for any help,
Allan @+NRG

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