How To Test The Battery: Voltage…
The first, basic, test is battery voltage. With a voltmeter check the voltage across the battery terminals. Make sure the key is OFF and any battery-operated items are off as well. You should have 12.5 to 12.6 volts across the battery terminals. 12 volts is acceptable if the battery is not fully charged but will turn over and start the engine. If voltage is less than specified, we need to go on to the next test.
With the engine running and with a properly operating charging system and fully charged battery Car Charger for iphone, the voltage should be about 14.6 volts.
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How To Test The Battery: Specific Gravity…
The next test is the “State Of Charge” (SoC). For this we will need a battery hydrometer. They are very inexpensive and you can get them at any parts store or Wal-Mart. I would avoid the 'balls' type and get the 'float' type; they are much easier to read. A battery hydrometer measures the proportion of sulfuric acid to water, which is a precise measure of the level of charge.
First remove the cell caps and check the electrolyte level. The level should be just at the level of the cell hole. If it isn't you will need to top it off. Ideally you should use distilled water. In a pinch you can use rainwater since it is cleaner than tap water and does not contain chlorine, calcium or magnesium. Using Reverse Osmosis (RO) or tap water to refill batteries can produce chlorine gas or calcium sulfate crystals that can fill the pores and coat the plate that reduces the batteries capacity.
How To Test The Battery: Low Or Maintenance Free Batteries
If you have a low maintenance or maintenance free Iphone 4 Built-in Battery there are probably cell caps hidden under the stickers. Lift the stickers up and you should be able to see them. Put the hydrometer hose into the cell and draw enough electrolyte into it to reach the 'full' line.
How To Test The Battery: Load Testing…
You will need some special equipment to load test a battery. You can buy a Iphone 4G Power Battery load tester at the parts store anywhere from .00 for a basic tester to well over ,000.00 for one with all the bells and whistles. Me? I like bells and whistles. I have the Milton Battery Load Tester that works very well and I have had it for years. Basically you connect the load tester to the battery and hold the load switch. Count 15 seconds and read the meter. It should be in the green zone for a good battery. Don't hold it for more than 15 seconds or you will damage the tester.
If the test ends up in the yellow and it's springtime, you may make it through the summer. If it's in the red zone, buy a new battery.
Battery Maintenance And Care…
Batteries do so much and ask so little, but what they do ask for they insist on. Like you, they like to be clean and need a bath every once in a while. First wash the battery with lots of water. Don't forget to wear your protective glasses. Heavy corrosion can be neutralized with a mixture of one pound of baking soda to one gallon of warm water. Some folks have been known to use Diet Coke or Diet Pepsi to dissolve corrosion. Once the corrosion is cleaned off remove the battery terminals and look at them. Any terminals that are cracked or broken should be replaced. Using a battery brush clean the battery posts and terminals until they are nice and shiny. Bare metal-to-metal mating surfaces are required for good current conductivity. To prevent corrosion on terminals, thinly coat the terminals, terminal clamps and exposed metal around the car battery with high temperature wheel bearing grease or silicone. Gluing a sacrificial anode, such as a penny or a piece of copper to the top of the battery will prevent or reduce terminal corrosion.
Replace the battery if the battery case is bulging, cracked or leaking, especially around “GM” style side terminals.
How To Test The Battery: Voltage…