Cadex Electronics Inc. C7000-C Series Battery Analyzers .
Default Charge and Discharge Rates
NiCd: Standard NiCd batteries up to 1800mAh can be charged and discharged at rate of
1.00C (C stands for capacity). Cadex recommends a C-rate of 0.70C or 0.50C for batteries
above these mAh ratings. The default setting for NiCd is 1.00C. For 1.2V and 2.4V
batteries, the default charge rate is 0.30C to maintain normal temperatures.
NiMH: NiMH batteries produce heat during Charge and Discharge. The default charge rate
is 0.50C if Temperature Sensing is Disabled. In addition, due to the very fine negative
slope, the current is cut in half twice towards the end of the charge cycle to ensure that
the battery is fully charged (this current is not reduced if the Charge rate is at 0.10C). If
temperature sensing is Disabled, a rest period is applied before the current is cut to allow
for the battery to cool. This lengthens the service time. For 1.2V and 2.4V batteries, the
default rate is 0.30C to maintain cooling. If the battery gets hot during charge, reduce the
Charge rate to 1000mAh or less.
SLA: Battery manufacturers rate the SLA at a 20-hour discharge (0.05C). This slow
discharge is not practical when analyzing SLA batteries so the analyzer uses a default
0.30C Charge and 0.10C (10-hour) discharge. Due to this higher discharge rate, the
battery will give a lower capacity. Refer to the manufacturers specification for the battery
rating at the 10-hour discharge and adjust the battery rating (capacity) for the higher
discharge rate.
Li-ion: Most Li-ion (and Li-Polymer) batteries can accept a 1.00C Charge and Discharge
rate. This is the default Charge and Discharge Rate.
Trickle-Charge Rate (NiCd and NiMH only)
The Trickle Charge Rate parameter defines the charge level required to maintain the
charge on a NiCd or NiMH battery after service is complete.
Available settings: 1% – 10% of the rated capacity.
The recommended and default rate is 2%. This rate compensates for any self-discharge
and maintains temperature. During Trickle Charge, the battery should remain cool and
battery temperature should be less than 5
o
C above ambient temperature. If the battery
feels warm, reduce the trickle charge.
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