Is there an appreciable difference in manufacturers? What are the
advantaged/disadvantages of Alkaline? I use a Garmin GPS60 which in the
set-up has the choice of alkaline or not battery set up. which would
give the longest life please?
That brings back memories of some current meters (sea currents) where
the alkaline battery pack was an expensive item only available from the
Someone <cough> tried to save money by making packs up with normal
cells, not realising that the special cells were non steel-cased so as
not to affect the compass (rotating magnet with optical encoder disc).
It all depends how you use it, how often and peak current drawn.
I find NiCad powered kit is invariably flat whenever I need it and the
same with early NiMH cells but the new low self discharge are OK.
Rechargeables invariably have lower energy density and somewhat higher
self discharge rates than single use batteries.
Li-ion batteries are a lot better but may self immolate if provoked and
are no good as replacements for normal AA/AAA batteries (wrong voltage).
Alkaline cells are good for higher currents and classic zinc carbon
batteries are OK for non-critical loads at lower currents. Fine for
clocks and the like. My desk phone LCD display will only work well if I
use 2x zinc carbon AAA's and fades out in days on rechargeables :(
Duracell seems to be pretty good for heavy use (although that said I
have had genuine ones leak on me) and there are convincing fakes about.
For anything non-critical I tend to use Wilko's or Poundshops worst if I
don't have any charged NiMH available and need it immediately.
How long is a bit of string time then. I don't know the consumption of a
modern sat nave etc, but do you actually need one if you have a modern smart
Alkaline seem to have good power density for quite high current drain and
their end voltage does drop off a bit. Rechargeable, of the good kind not
the cheap ones, seem to be almost as good as little self discharge occurs
with the good kind.
Obviously whether one is cost effective depends on whether you can find
good offers on cheap Duuracells that are genuine. I don't think the other
brands except Panasonic Alkaline are quite as good.
I t now tend to use rechargeable myself for most things but I'd hate to be
half way to somewhere with a sat nave and it needs new batteries. I'm
surprised that in a car it cannot use the car electronics supply.
End of problem.
Of course if you are hiking across Dartmoor there are not many places to
charge batteries there.
I'd rule outall normal dry batteries as they are worse than useless for
most things except electric clocks!
This newsgroup posting comes to you directly from...
Alkaline or rechargeable setup affects only the display of the battery capacity
remaining, not the drain on the battery.
Keep the backlight off, or low, and not continually on, and the batteries will
IKEA AA are good value for money, and the Garmin also runs happily on
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