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→ Distinguishing features
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◆ Such batteries have a magic eye.
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◆ This magic eye -arrow- provides information on the electrolyte level and charge of the battery to be tested.
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◆ There are three different colour indicators:
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‒ Green ⇒Battery adequately charged
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‒ Black ⇒ Not or inadequately charged
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‒ Colourless or yellow ⇒Critical electrolyte level reached; topping up with distilled water essential
Note:
If a battery is more than 5 years old and the indicator of the magic eye is colourless, the battery is to be replaced with a new one.
Test sequence
Notes:
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◆ Air bubbles may form under the magic eye, particularly if a battery has been re-charged, i.e. even if the battery has been charged whilst driving. These air bubbles falsify the colour indicator of the magic eye.
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◆ If batteries are fitted with caps for production reasons, these are covered with plastic sheeting.
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‒ Before performing visual inspection, tap gently and carefully on magic eye with the handle of a screwdriver.
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‒ This disperses the air bubbles
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‒ Observe colour of "magic eye" indicator.
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