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Replacing Ni-Cad batteries in an electronic flash

No, none of the early flash chargers were trickle ones. They did not switch over to trickle after charging, but had to be disconnected instead.
By Trickle I mean "slow overnight charge" that needs to be turned off manually at the end. You might have a different name for it.
 
To my understanding "trickle charging" means the fully charged device continuously hanging at the charger and just to be charged to counter capacity losses. But as non-native speaker I am in doubt of course.
 
any RadioShak-like store carries them.

We are fortunate to still have a Radio Shack franchisee in the local area, with knowledgeable folks. They could not find a NiCad cell of the size and voltage I needed, either on their shelves or in their wholesale catalogs.

Andy
 
To my understanding "trickle charging" means the fully charged device continuously hanging at the charger and just to be charged to counter capacity losses. But as non-native speaker I am in doubt of course.
That is probably correct as you have said. The thing I was referring to could be probably better said as "unregulated slow charge."