I like Walmart's Everstart batteries.
ALL non-deep-cycle lead acid batteries hate a deep discharge. No specific fault of the Optima. But like I said above, I am very happy with my $30-range Everstart.quote:
Originally posted by OffOrWFO:
I have heard the optimas don't like to be run completly dead dead and if you do bring them back up with a slow charge to start with.
I was in an Autozone yeaterday checking for some GC 0w30 and happen so see the Duralast batteries on display. One Grp 48(size for my Passat)I saw looks and is speced exactly like the MTP-91 I just installed, down to the tapering vent tube design(sans the red top cover). It is also $20 cheaper and was wondering if I did the right decision.quote:
Originally posted by doitmyself:
Also, to answer my question, JC said that their batteries you buy from Autozone, etc. are all the same quality compared to their Interstate version.
I don't think it's my starter because I was jumped the other day and it started right up. This morning it started up after a couple of seconds. When started and at idle my battery indicator reads just below the 14v mark. I'm thinking it's the battery.quote:
Originally posted by oilboy123:
Sounds like you need to check out your Battery, alternator and or started/solinoid.
I would check battery voltage and verify it's close to 12.6 after sitting for a few hours.
You might want to clean terminals and check alternator output. with engine running should be close to 14.0 volts.
It is always best to start with the battery/terminals and rule them out then make sure alternator is charging if batt is good but low on charge.
Then if you still have problems start looking at starter/ batt cables.
I hope you red top is going to lastfor longer than 4 yrs because I have one and 2 other family members as well.
Good luck
Great info, thanks. Do you think it would be ok to 'slowly' charge the battery (Optima Redtop) even though it's 'partially' charged as you stated? Is this something any mechanic shop would have or would it be better to buy something like this(see link)?quote:
Originally posted by kgb007stb:
A discharged battery will not accept a full charge from an alternator because of the high internal resistance on the plates from the SO4 crystals. Best way to attack this problem is to put the battery on a constant 1-2A charger which will slowly bring the battery up to full charge. You are “thinking” that the battery is charging while running the engine but that is not the case as a discharged battery will not accept the high current rate produced by the alternator. This in effect starts the cycle where the battery is semi-charger causing the SO4 crystals to harden even further creating more internal resistance which will eventually render the battery useless.
Hence the reason why you are resetting your clock, this is either because the battery is not properly charged so it cannot supply the required current or the high internal resistance which will act like a bottle neck further not supplying the required current.
I like the 14.2V when idling, however I do not like the 12.7V right after shut down. After shut down the voltage should be in the 13V range for a couple of hours before settling in the 12V range implying that there is no major draw on the battery.
Think of the whole charging situation as pouring hot water into a sink full of dishes with cold water in it. When the hot water is poured in at a high rate (alternator) the water will appear to be hot near where the water is entering the sink, (plates on a battery) yet on the outside edges it will appear to be cold. Hence the reason why if you pour water at a slow rate (slow charging) everything will have ample time to mix and be at equilibrium, rather than pouring the water at a high rate ( high charging current) which will make it look like the sink is full of hot water, when in reality the fat edges still have cold water.