Dave Plowman (News) wrote:
In article ,
dennis@home wrote:
The biggest problem with rechargeables is the internal resistance (or
lack of), some devices rely on it to limit current and don't last long
when you put rechargeables in.

That sounds like incredibly poor design. If the internal resistance is
limiting the current the batteries won't last long. Except on something
like a drill where the load varies and you need maximum power at times.

I've heard of it happening, but only to *very* early flashguns, from
before the days of rechargeables. The transistors couldn't cope with the
current available from rechargeables, and the design relied on the
internal resistance of the primary cells to limit the current drawn. As
soon as rechargeables became readily available, the designs changed.

--
Tciao for Now!

John.

On Jul 19, 9:22*pm, John Williamson
wrote:
Dave Plowman (News) wrote:
In article ,
* *dennis@home wrote:
The biggest problem with rechargeables is the internal resistance (or
lack of), some devices rely on it to limit current and don't last long
when you put rechargeables in.

That sounds like incredibly poor design. If the internal resistance is
limiting the current the batteries won't last long. Except on something
like a drill where the load varies and you need maximum power at times.

I've heard of it happening, but only to *very* early flashguns, from
before the days of rechargeables. The transistors couldn't cope with the
current available from rechargeables, and the design relied on the
internal resistance of the primary cells to limit the current drawn. As
soon as rechargeables became readily available, the designs changed.

Petzl Tikka Plus LED headtorch has some dire warnings about using
cells with lower internal resistance than alkaline. So I feed it with
pound shop Kodak alkaline AAAs.