Commonly Used Terms - HITEC X2 AC Plus Black Edition Manual

Commonly Used Terms

Commonly Used Terms:
A, mA: Unit of measurement relating to a charge or discharge current. 1000
mA = 1A (A = Ampere, mA = Milliampere).
Ah, mAh: Unit of measurement for the capacity of a battery (Amperes x Time
Unit; h = hour). If a pack is charged for one hour at a current of 2A, it has been
fed 2Ah of energy. It receives the same quantity of charge (2Ah) if it is charged
for 4 hours at 0.5A, or 15 minutes (=1/4 hour) at 8A.
'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).
Final Charge Voltage: The voltage at which the battery's charge limit (capacity
limit) is reached after which the charge process switches from a high current
to a low maintenance rate (trickle charge). From this point on, any further high
current charging would cause overheating and eventual terminal damage to
the pack.
Final Discharge Voltage: The voltage at which the battery's
discharge limit it reached. The chemical composition of the batteries
determines the level of this voltage. Below this voltage, the battery enters
deep discharge zone. Individual cells within the pack may become reverse
polarized under these conditions, resulting in permanent damage.
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. An 8-cell
pack will have a nominal voltage of 9.6 volts (8 x 1.2).
- 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 (3 x 3.7).
4-cell LiHV wired in a series will have a nominal voltage of 14.8 volts. (4 x 3.7).
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