Re: Sourcing batteries/cells thought to be obsolete.
To add to the posts above regarding 996 lantern batteries containing 4 cells each F size, this is not true of all makes.
Some contain 4 D cells with a spacer. These can be recognised without dismantling by the off-centre weight of the battery.
AAAA cells are indeed found in some but not all small 9 volt transistor batteries.
They are used in some modern ultra slim LED penlights.
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