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Originally Posted by Diaphone Jim
I well remember having new batteries filled at the parts store, but not that old filler.
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That's a pre Big One, WW II, item, before plastic became ubiquitous.
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I think it was made to be refilled itself by turning upside down and putting in a fresh jug of sulfuric acid, potent stuff best not spilled.
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I don't know if they refilled that bottle of they bought it in bottes like that and swapped them out.
At Boeing we had Sulfuric and Hydrochloric in stainless steel drums that looked just like beer kegs. A tapper and an evil mind could really hurt.
