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Glossary of terms
Amps(A)
: The unit of measure for charge or discharge electric current. The program of
the charger will show most of the current in amps(A) at its LCD screen.
Milli-amps(mA)
: The electric current, being amps(A) multiplied by 1000 and noted as
'mA'. So 2.0A is the same as 2000mA (2.0x1000). Or, to convert mA to amps, divide the
mA number by 1000. So 200mA is the same as 0.2A. If a current value is below 1.0A,
the LCD screen of the charger will still show the current in amps, not milli-amps. For
example, a current of 600mA will be displayed as 0.6A, and a current of 100mA will
actually be shown as 0.1A.
Capacity,milli-amp hours (mAh), and amp-hours (Ah)
: Charge energy stored by a
battery is called capacity, which is defined as how much current a battery can supply
constantly over one hour of time. Most hobby batteries are rated for capacity in 'mAh' or
milliamp hours. A 650mAh battery can deliver 650mA of current for one hour
(650mAx1hr = 650mAh). The batteries of very large capacity, such as lead-acid(Pb)
batteries, are usually rated in 'Ah' or amp-hours. A '12V 60Ah' car battery can deliver 60
amps of current for one hour (60Ax1hr = 60Ah).
Nominal voltage(V)
: The nominal voltage of the battery pack can be determined as
follows;
-.NiCd or NiMH: multiply the total number of cells in the pack by 1.2. A 8-cell pack will
have a nominal voltage of 9.6 volts (8x1.2).
-.LiPo: multiply the total number of cells in the pack by 3.7. A 3-cell LiPo wired in series
will have a nominal voltage of 11.1 volts (3x3.7).
-.LiIo: multiply the total number of cells in the pack by 3.6. A 2-cell LiIo wired in series
will have a nominal voltage of 7.2 volts (2x3.6).
-.LiFe: multiply the total number of cells in the pack by 3.3. A 4-cell LiIo wired in series
will have a nominal voltage of 13.2 volts (4x3.3).
If the nominal voltage of the battery is not printed on the battery's label, consult your
battery manufacturer or supplier. Do not guess the rated voltage of battery.
'C'-rating
: Capacity is also referred to as the 'C' rating. Some battery suppliers
recommend charge and discharge currents based on the battery 'C' rating. A battery's
'1C' current is the same number as the battery's rated capacity number, but noted in mA
or amps. A 600mAh battery has a 1C current value of 600mA, and a 3C current value of
(3 x 600mA) 1800mA or 1.8A. The 1C current value for a 3200mAh battery would be
3200mA (3.2A).
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