PowerGenix Nickel-Zinc Charge Procedure

Two Step Charge

  1. Constant Current: 1C rate to 1.9V/Cell
  2. Constant Voltage: 1.9V/Cell to charging current < C/20 value

Fault Conditions

  • Total charge time exceeds 2.5 hrs
  • Temperature of the cell rises by more than 15C
  • Voltage is less than 1.6V, five minutes after start of charge

Notes: For Laboratory Testing: Non temperature compensation at 25°C +/- 3 degrees

Temperature Compensated Charge Procedure

Two Step Charge

  • Temperature Compensated Voltage (TCV) = 1.90 - (0.002 x (T-25ºC) V/Cell
  • Constant Current 1C rate to TCV
  • Constant Voltage TCV to I < C/20 value

  • 1C rate = current required to completely discharge a fully charged battery in one hour. For example, 40A for a battery nominally rated as 40Ah

    C/20 = current required to completely discharge a fully charged battery in twenty hours. For example, 2A for a battery nominally rated as 40Ah


Fault Conditions

Stop Charge if the any of the following conditions occur:

  • Total charge time exceeds 2.5 hrs
  • Temperature of the cell rises by more than 15ºC
  • Temperature of the cell exceeds 40ºC
  • Voltage is less than 1.6V, five minutes after start of charge

Typical Charge Characteristics of a 2000mAh Cylindrical SubC Cell at 25°C

Charge Characteristics

Maintenance Charge Procedure

Recharge cell/pack per Standard Charge Procedure if:

  • Volts per cell < 1.68 V
  • Time since last full charge > 30 days