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In recent years, you often hear people
say things like "Nickel Cadmium Batteries and Nickel-Metal
Hydride Batteries are hard to use because they get memory
accumulation" or "when a battery starts to
accumulate memory, it's time to replace it." The
term "memory accumulation" arose when nickel
cadmium batteries started to be used in Camcorders (portable
video recorders) 10 years ago, and since then, the term
has become something with which most people are familiar.
However, since many users don't seem to understand what
it really is, we will try to explain it. |
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What is memory accumulation? |
| Memory accumulation
is the name given to the phenomenon when a battery
remembers how much it is discharged, resulting in
a temporarily voltage drop. The secondary batteries
that are said to be vulnerable to memory accumulation
are Nickel Cadmium Batteries and Nickel-Metal Hydride
Batteries. |
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| What causes
memory accumulation? |
| It's caused by repeatedly
using a battery without running the power supply
down completely. |
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| Why is
it a problem? |
| Memory accumulation
is often caused by the way the equipment using the
batteries is designed. If a battery accumulates
memory, the battery's operating time can become
extremely short. When batteries are used with equipment
that is designed for nickel cadmium/Nickel-Metal
Hydride Batteries, or with equipment not affected
by voltage drops, memory accumulation is not a problem. |
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| Does memory
accumulation mean a battery's life is over? |
| No. You can still
use it.
A voltage drop due to memory accumulation is just
like a voltage drop due to the changes in the ambient
temperature or discharge current -- it's only temporary. |
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| Memory accumulation
has very little effect on equipment using nickel cadmium/Nickel-Metal
Hydride Batteries. |
| Since most of our
battery Applied Products are designed to be resistant
to battery voltage drops, you never need to worry
about memory accumulation. If equipment is at all
affected by memory accumulation, Sanyo offers a
special battery charger function called "refresh"
that eliminates the problem. |
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| Click
here for more information on memory accumulation. >>>>> |
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| Note: "Memory Accumulation"
is not an academically defined term. In this section,
we explain the condition using the generally accepted
term "memory accumulation." |
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