There is no lead acid battery made, Which is happy being both undercharged and hot.
Vehicles do not fully charge batteries. 80% charged to 100% charged cannot be accomplished in less than 3.5 hours. That 3.5 hours assume a mid 14 volt range is held that entire time.
Your vehicle will not hold that higher voltag, For that much time. Even if you drove for that long.
Lead acid batteries ideally always want to be fully charged. And cool.
No lead acid is battery is immune to being hot and undercharged.
Any reports of battery longevity. Good or bad, defects aside, are entirely meaningless, without knowing the average state of charge and the average temperature of the battery.
A good high $ agm battery has little self discharge. 1 to3% per month at 77f.
An old flooded battery in poor health can self discharge 1% or more each day.
Parasitic loads can and will discharge a battery. These vary greatly among different vehicles.
If anybody wants excellent battery longevity, the battery must live close to 100% charged at all times. Some vehicles might do ok. Some others dont shiv a git.
Properly charging a battery is all about the voltage regulation. The battery needs to be brought uoto mid 14s for a period of time, and once full then a lower voltage is preferred.
Vehicles do an extremely poor at topping off a battery.
So do most smart chargers. Especially on an unhealthy battery.
Urinating into the wind. People will always believe the sticker.on the battery is directly related to battery life.
Defects.aside. the worst cheapest battery kept near full charge will greatly outlast the most expensive battery chronically undercharged.
Higher quality batteries might recharge faster at the same voltages
Higher quality batteries might regain cca and capacity with an extended overcharge. Where as lesser batteries will not.
The battery manufacturers and their marketers are only concerned with maximum profit. They are second guessing every consumer to get that end of year bonus. Battery X, that lasted 5 years is made by someone else now, and to a different standard.
Keep your bttery as fully charged as possible and full as posible. Temoerature might be uncontrollable but state of charge is.
A 30 %charged battery can still easiky start an engine. The fact that thebattery can still start the engine is no indication of its state of charge or health.
I hve a 6 year old battery with more than 12p0 deep cycles.on it and many thousands of engine starts. I can drain 70 of.its 90 (when new and fully charged) amp hours from it, and it still easily starts my engine.
When new it would stay over 12.2v under the ~180 amp starter motor load. Now.it drops a lot lower than that, but never struggles to actually start the engine.
Get whatever battery that you can warranty easily. If yiu want the bestbattery. Bring a bathroom scale. The heavier group 34 battery will stand up to abuse better than the lighter 34.
The heavier one will likely have lower cca too.
But but but mo is better fo sho.....!
I gotta stop bothering regarding this subject on this forum. Magic stickers and brand loyalty, supreme ignorance, and parrots shout the loudest.
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