A tad expensive, but otherwise I'm not aware of any issues with them.
They are supposed to be more vibration resistant then the regular
batteries which could help in some applications.
I seem to get adequate service life out of the regular batteries at a
decent cost savings though, and I do go off road with some frequency so
that vibration seems to not be an issue. With dual batteries in the
truck, when one does fail I can typically just swap the Aux into the
main position in about 10 minutes and continue on my way.
I'm not sure what the usual failure mode of an Optima is, but on the
regulars in my truck at least they seem to fail with a shorted cell and
nearly explode (never actually exploded though). When you start to get a
strong sulfur smell check the voltmeter and see if it's a few volts
below normal and if so stop and check the battery quickly.
I've got one on my 99 Blazer. goin on 6 years now. Got another in my S10
pickup goin on 2 yrs. THe pickup has been deep discharged at least a dozen
times. Still no issues. and they realy crank on a cold day. You may need to
adjust the voltage regulator to the battery if its an older car The battery
FAQ is a good place to read. http://www.batteryfaq.org /
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