3.What are the differences between Primary Battery
and rechargeable battery?
A primary battery is not intended to be recharged and is
discarded when the battery has delivered all of its electrical energy.
A
rechargeable battery is a galvanic battery which, after discharge, is restored
to the fully charged state by the passage of an electrical current through the
cell in the opposite direction to that of discharge.
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4.Charging nickel-based batteries
a. Constant Current charge: A battery charge regime whereby the current drawn
during the charge remains constant.
b. Constant Power charge: A battery
charge regime whereby the current decreases during the charge as the battery
voltage increases.
c. Constant Current and voltage charge: the battery keeps
constant voltage when up to a certain voltage by cc charging. The battery is
with less and less current until without any current.
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5.Charging Lithium- based battery
Constant Current and voltage charge: the battery keeps
constant voltage when up to a certain voltage by cc charging . The battery is
with less and less current until without any current.
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6.what's the "memory effect" of battery?and how to
clean out it?
Ni-cd batteries, and to a lesser extent Ni-MH batteries,
suffer from what's called the "memory effect". What this means is that if a
battery is repeatedly only partially discharged before recharging, the battery
"forgets" that it has the capacity to further discharge all the way down. To
illustrate: If you, on a regular basis, fully charge your battery and then use
only 50% of its capacity before the next recharge, eventually the battery will
become unaware of its extra 50% capacity which has remained unused. The battery
will remain functional, but only at 50% of its original capacity.
The way to
avoid the dreaded "memory effect" is to fully cycle (fully charge and then fully
discharge) the battery at least once every two to three weeks. Batteries can be
discharged by unplugging the device's AC adapter and letting the device run on
the battery until it ceases to function. This will insure your battery remains
healthy.
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7.What causes short lifetime of battery? How to
prolong the lifetime of battery?
1. Reason:
a. Charger or electro circuit can¡¯t be fit
for the battery.
b. Overcharge and overdischarge, etc.
c. Battery can¡¯t
comply with the charging requirement
2. Solution:
a. Use the original
charger.
b. Charge the battery after it automatically powers off , then full
charge the battery.
c. Avoid erroneous usage of battery, such as heavy
pressure, short circuit, fall off and so on.
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8.Why can¡¯t the battery be charged? How to solve this problem?
1. Reason:
a.The battery has no voltage.
b.There is problem with
charger, as it has no output electric current.
c.Low charging efficiency due
to external cause.
Solutions:
a.Test whether the charger has voltage and output electric
current or not.
b.Check if the charger is well contacted with battery.
c.Activate the battery with voltage and current 1.5 time higher then the highest
ones of battery. (Use this method only when the battery can¡¯t be charged.)
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9.What¡¯s the reason that causes battery with no voltage or low
voltage? How to avoid this problem?
1.Reason
a.No voltage.
b.External shot circuit or overcharge,
anti-charge
c.Cells expansion and short circuit caused by direct anode
contact and continuous high efficiency electric current overcharging.
2.Solutions:
a.Check if the battery is without voltage or electric
current.
b.Avoid short circuit.
c.Avoid collision and pressure among
batteries.
d.Charge the battery after it automatically powers off , then full
charge the battery.
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10.What caused short discharge time of battery? How to prevent this
problem?
1. reason:
a.The battery hasn¡¯t been full charged, such as inadequate
charging time, lower charging efficiency.
Battery Glossary
Battery: Two or more cells connected together
Cell: An
electrochemical system that converts chemical energy into electrical energy.
Capacity: This is amount of energy a battery cell or battery pack actually
provides. The higher the capacity the longer the equipment will run on battery
power. Usually measured in Amp hours (Ah) or Milliamp hours (mAh).
battery
Charge:This is the process of passing electricity into the battery pack so the
pack can be used to provide power when the user is away from mains power
Li-ion :Lithium Ion. This is one the newest battery types available. It can
offer the same power as a NiMH battery in a smaller lighter package. This type
does not suffer from 'Memory Effect' but it is expensive to manufacture.
NiCAD:Nickel Cadmium. This is one of the older battery technologies that are
still in use. Usually found only in older equipment or applications that require
a high power drain. Very prone to 'Memory Effect'.
NiMH :Nickel Metal
Hydride. This battery type has virtually replaced the NiCAD batteries. This type
offers higher capacities, around 30% more than a NiCAD cell of the same physical
size. This type is also reported to suffer less from 'Memory Effect'.
Battery Float Voltage: A unit for measuring electrical pressure. All batteries
provide DC (Direct Current) electricity. It is important to ensure that the
equipment you are powering is being provided with the correct volt or else
damage may occur.
V(olts):The voltage of the new battery should always match the voltage of the
original.
mAh:It standards for milli-Amp hours(1 mAh=0.001Ah),Hight amp-hour
ratings means a longer run-time and will not cause incompatibilities.
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