Life of lead acid battery years,honda civic overheating uphill,battery operated fan big w - 2016 Feature

Try our new Category View for Detailed topics segregated by their topic.Now it's even easier to find the information you need. You can also receive our Detailed Auto Topics, delivered to your computer, as soon as they are written. Diagnosing repeat battery failure is easier with an understanding of how they operate.A battery is usually considered dead when it fails to crank a vehicle. This means that a 600 amp hour battery bank in practice only provides, at best, 300 amp hours of real capacity. Other task include, subsidizing the alternator at low engine speed, preserving memory for the onboard computers and keeping system voltage closely regulated.
The lead acid battery operates by a chemical reaction between the sulfuric acid in the electrolyte, and the metal plates.A fully charged battery has positive plates, made of lead peroxide.
As the battery discharges, oxygen (O2) molecules in the lead peroxide, are displaced by the sulfur (SO4) from the sulfuric acid.
Sulfur converts the plates to lead sulfate (PbSO4) and the oxygen combines with the acid to form water (H20). Peukert), and in practice this means that high current loads like an air conditioner, a microwave or an induction cooktop can result in a lead acid battery bank being able to actually deliver as little as 60% of its normal capacity.
When this occurs the battery is discharged and no longer produces the needed electricity.Recharging the battery immediately after discharge reverses the process. Allowing a battery to remain discharged, even for a short period will shorten the life considerably.

Sulfates on the lead plates become extremely difficult to remove if allowed to remain in place.
If not removed, they insulate the lead from the acid and the battery loses capacity.A similar situation occurs if the electrolyte becomes low. They also must be stored upright, to avoid battery acid spills.AGM batteries do not have these constraints, and can be placed in unventilated areas – even inside your living space.
Most often this is the result of overcharging, as with a bad alternator or exposure to extreme heat.Temperature has a dramatic affect on a battery. Being maintenance free comes with a downside though – a flooded cell battery that is accidentally overcharged can often be salvaged by replacing the water that boiled off.
Higher temperatures will increase output, but also shorten battery life.Colder temperatures slow the chemical reaction and reduce battery output.
The voltage drops below 12 volts when the battery still has 35% of its total capacity remaining, but some electronics may fail to operate with less than a full 12 volt supply. A battery reduced to 80 percent capacity by summer heat, may fall below 50 percent on the first cold day.
Even a battery with 100 percent capacity at 80 degrees, will only produce around 65 percent of its capacity at 32 degrees Fahrenheit.
Hot weather does the damage and cold weather reveals it.Parasitic draw robs life from a batteryParasitic draw is current that continues to flow, even when the vehicle is switched off. Everyone is familiar with the result of leaving headlights on or leaving lights on inside the vehicle.

If one or more computers remain on, due to a malfunction, the current draw can easily increase ten fold. If the discharge is not too severe, the alternator may restore much of the power when the vehicle is driven. This is also extremely hard on the charging system and shortens alternator life.Parasitic draws of this nature may give no outward signs other than repeat battery failure.
After each circuit is disabled the process must start again, waiting for everything to power down, before another reading can be taken. With the huge number of possibilities, the process may take several hours.A much more difficult problem is an intermittent draw. Testing for such a draw is impossible, unless it is occurring at the time the vehicle is tested.Professionals use judgement, experience and a great knowledge of the system to locate parasitic draws.
It can be one of the most difficult task in auto repair.Batteries that last considerably less than three years indicate a problem.

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