Sealed Type Batteries require higher charge than Dry Charge or Conventional types. Make sure you never charge this battery type with Conventional Battery Charger. You should rather choose professional quality chargers.
Sealed types of batteries come pre-activated from factory which means electrolytes are already added in the battery and the case is sealed. Given below are a few instructions to follow:
Terminal shapes vary from one battery to another. By identifying the correct replacement battery from the listing in this book, you are assured of the proper terminal configuration.
If sulfuric acid is swallowed or splashed in the eyes, take immediate action. While the diluted sulfuric acid used as electrolyte can burn the skin, this type of injury is generally less serious. Sulfuric acid in the eyes can cause blindness. Serious internal injuries or death can result from ingesting sulfuric acid.
If you’re choosing between two hydrometers, opt for the calibrated float type. It gives you an exact specific gravity reading (that is, the density of the electrolyte compared to water), that’s much more accurate than floating balls. A voltmeter or multimeter can be used where a hydrometer can’t. Most sealed or low maintenance batteries have to be tested with a voltmeter.
Battery testing requires a voltmeter that can measure DC voltage. Remember to always connect a voltmeter parallel to the circuit being tested, observing polarity; otherwise, the pointer will travel in the wrong direction. It’s a good idea to periodically check a voltmeter against another one of known accuracy.
There are two types of battery tests: Unloaded and Loaded. An Unloaded Test is made on a battery without discharging current. It’s simplest and most commonly used. And if you need a precise reading, loaded testing is the answer. It’s more accurate.
Check charge condition using either a hydrometer or voltmeter. With a voltmeter, voltage readings appear instantly to show the state of charge. Remember to hook the positive lead to the battery’s positive terminal, and the negative lead to the negative terminal.
A hydrometer measures the specific gravity of each cell. The specific gravity tells the degree of charge: generally, a specific gravity of about 1.265 to 1.280 indicates a full charge. A reading of 1.230 to 1.260 indicates the battery should be charged before testing. The chart below shows the charge level as measured by syringe float hydrometer, digital voltmeter and five – ball hydrometer.
|State of Charge||Syringe Hydrometer||Digital Voltmeter||5-Ball Hydrometer|
|100% Charged w/Sulfate Stop||1.280||12.80v||5 Balls Floating|
|100% Charged||1.265||12.60v||4 Balls Floating|
|75% Charged||1.210||12.40v||3 Balls Floating|
|50% Charged||1.160||12.10v||2 Balls Floating|
|25% Charged||1.120||11.90v||1 Balls Floating|
|0% Charged||less than 1.100||less than 11.80v||0 Balls Floating|
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