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Author Topic: Most probably a silly Question  (Read 1535 times)
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« on: May 27, 2017, 05:55:08 PM »

Can any kind soul explain to me how the battery charge indicator works,
 on Sealed Lead Acid  Batteries that have a small round  window in their top face
 that  shows green when serviceable.

Many thanks
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« Reply #1 on: May 27, 2017, 06:29:52 PM »

Think its a load of "balls" - literally Smiley

I think they use a tube with a coloured ball (usually green) in it . It is basically indicating the specific gravity so if the specific gravity changes, i.e. the battery is discharged then the ball sinks, when charged  the ball rises towards the top of the tube - where you view it. This gives the illusion of a coloured indicator "light". Can also indicate low electrolyte level.


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« Reply #2 on: May 27, 2017, 07:14:07 PM »

It doesn't.

It's a hydrometer that measures one cell only and not usually the outer cells that age faster.
Sealed batteries aren't very sealed should you want to SG test the lot.
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