Simple • Capable • Safe
Understanding C Ratings:
Many battery manufacturers do not list the deﬁnition of or explain the purpose of C ratings and how to use that information. For some batteries
such as LiPo, there is typically listed both a C rating for charging and discharging of the batteries. You must use caution that you calculate your
charge rate based on the charge C rating and not the discharge C rating.
• Charge Rate Calculation
› The charge C rating of a battery refers to a ratio between the battery’s capacity and the maximum safe charge current as determined
by each manufacturer for each battery. This value is typically listed in the lower ranges between 1C-5C. It signiﬁes the maximum
current the battery should be charged at in a multiple of the capacity of the battery cells (on a per cell basis, not per pack basis).
» For example: if a battery cell is 2000mAh and the charge C rating is listed at 2C, the maximum charge current that should be
used with this battery is equal to 2000 x 2 = 4000mA = 4.0A.
» NOTE: 1000mAh = 1Ah. For simpliﬁed annotation, although charge rates are actually units of Ah, we refer to them as A only.
Thus 1Ah = 1A.
» Since the Origin charger only increments in values of 1A, if the calculated maximum charge rate is a decimal value (4.4) it is
highly recommended to round this value down to the nearest whole number and use that as the maximum charge rate, but
not necessarily the best charge rate option.
» If the calculated charge rate is over the maximum capability for this charger, you can simply use the maximum allowed.
› Always check the instructions provided with your batteries for proper charge and care. Those instructions should over-ride these
since they pertain to the particular battery that you have and this is a general statement.
› If you do not have or cannot obtain your manufacturer’s recomended settings, Radient RC recommends charging at 1C for the
maximum cycle life of your batteries as this is the most common manufacturer recommended charge rate.
• Discharge Rate Calculation
› The discharge C rating of a battery refers to a ratio between the battery’s capacity and the maximum safe discharge current as
determined by each manufacturer for each battery. This value is typically listed in the higher range from 15C upwards. It signiﬁes the
maximum current the battery should be discharged at in a multiple of the capacity of the battery cells (on a per cell basis, not per
» For example: if a battery cell is 2000mAh and the discharge C rating is listed at 30C, the maximum discharge charge current
that should be used with this battery is equal to 2000 x 30 = 60000mA = 60A. This means you can continuously discharge
this battery at a rate of 60A per hour without damage.
» Since the Origin charger does not discharge, this information is only for reference in helping you understand the terminology
of the battery industry.
Termination Voltages (Peak Detection):
• The nominal voltage of a NiXX battery cell is listed at 1.2V.
• The Primal charger will terminate the charge of a NiXX battery pack when it measures a maximum voltage of the battery pack in a speciﬁed
range and then also measures a drop in that voltage of 8mV.
• The maximum voltage a battery pack reaches changes during the life of the battery (increasing with age). The characteristic behavior of
the voltage drop remains the same however thus allowing the charger to continue to detect a “peak” voltage (maximum voltage - 8mV)
regardless of age.
Power Rating (Watt-hour):
Some products state a recommended Watt hour rating for a battery to be used with that product. The Watt hours can be approximately calcu-
lated knowing the battery capacity and the voltage.
• For Example: if a battery is 2000mAh and the voltage is 8.4V the Watt Hours (Wh) is equal to 2000 x 8.4 = 16,800mWh = 16.8Wh.
Recommended Discharge Voltage Cut-offs:
For maximum cycle life and safety, NiXX batteries should never be discharged below 0.9V per cell when discharged at a rate of 1-4C. The use of
an ESC low voltage “cut-off” mode is not necessary with NiXX batteries.
Although the Origin charger does not offer discharge capabilities it is important to understand this information about your batteries since it is
critical to both the safety of the battery and the cycle life.
• Always consult the battery manufacturer’s documentation for storage information speciﬁc to that battery.
• The storage voltage of NiXX batteries is not as critical as with other chemistry’s like LiPo, but they should be stored in cool conditions and at
a low cell voltage to prevent memory buildup and loss of capacity and performance.