Re: Old torches - anyone here collect them?
I would recommend a 6 volt lantern battery over D cells. Fewer contacts and thus fewer opportunities for loose connections.
A reasonable quality zinc carbon lantern battery has a capacity of nearly 10 AH.
Alkaline lantern batteries exist but are uncommon and often expensive.
A good quality LED bulb is worth fitting, and readily reversed if original type bulb is wanted.
A 1 watt led bulb should give several dozen hours service from a zinc carbon battery.
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