about using a Rechargeable NiMH Battery? How do you select the
right battery? Which brand battery is a good quality and what
does mAh mean? Is the voltage difference in NiMH batteries important?
Do rechargeable batteries suffer from a "Memory Effect"?
Brands are important when choosing a rechargeable nimh battery.
Not all brands are equal. Some brands (particularly 'no-name'
brands) over-rate their battery capacity. The best way to find
the right brand is find out what people are saying about that
brand battery. If you're going to use the nimh batteries in your
camera visit a camera forum and find out what battery people recommend.
If you're putting the batteries in your kids toys then buy value.
Reserve the best batteries for your digital camera and MP3 players,
and the like.
This stands for Milli-Amp Hour. It's a rating of the capacity
of a battery. This is where the biggest variance comes in between
batteries. Generally speaking the higher the capacity (mAh) the
better. However, this rating depends on how the batteries were
tested. Again, this depends largely on the discharge rate. Most
nimh batteries are tested at a 20 hour rate. The capacity listed
should be it's rating at 20 hours. If your device is high drain
it may perform differently than at the slower 20 hour rate. Again,
the best thing to do is to be sure you're buying quality by checking
out the recommended nimh battery brands by publications and user
Alkaline batteries (non-rechargeable) are rated at 1.5V. Rechargeable
NiMH batteries are rated at 1.2V. This may sound like it poses
a problem but in most applications it doesn't. The reason is that
Alkaline batteries have what we refer to as a sloping discharge
curve. It would look something like this:
Rechargeable NiMH battery has more of a 'cliff' discharge curve.
The voltage doesn't drop as quickly and it holds the voltage stiff
for longer. The discharge curve looks more like this:
that the alkaline battery only kept the voltage up to 1.2V for
about 625 minutes while the NiMH battery kept the voltage up above
1.2V for over 950 minutes. Again, this is based on 1 specific
discharge rate, but the general rule holds true regardless of
the discharge rate.
Effect: What is commonly referred to as "Memory
Effect" is a very misunderstood concept. You can read more
about this in detail here.
In essence what is referred to as "Memory Effect" does
not affect NiMH batteries.
do you get the best NiMH Batteries? The PowerEx
NiMH battery was rated by Editor's Choice by PC Photo Magazine.
These are usually on the cutting edge and a great choice for photographers.
also makes a good quality cell and they are usually on the upper
end of the capacities available.
also the maker of the much talked-about Mach1
one hour speed charger that has won innovation awards several
years in a row at the Consumer Electronic's Show. They currently
make the highest capacity Rechargeable NiMH battery. They're cutting
edge and their quality is tested and proven.
Visit our website
Hours: M,T,Th,F 8AM - 7PM ET
Wed. 8AM - 5PM ET