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Amateur Radio Emergency Service |
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Internal Metal Hydride Battery Usage
| 16 February 2002 =============================== Use: 3½ Hours Receive; 48 Minutes Transmit Charging: 12 Hours Internal; 6¼ Days Trickle =============================== . . . Battery 1. Installed Battery Capacity -- 1600 mAH . . . Current Consumption 2. FT-817 Cutoff Voltage -- Approximately 7.4 Volts 3. Power-Off Current Usage -- Approximately 150 microAmps 4. Receive Current Usage -- 450 mA 5. Expected Receive Hours -- 1600 mAH/450 mA = 3½ Hours 6. Transmit Current Usage -- 2.0 A 7. Expected Transmit Hours -- 1600 mAH/2.0 A = 48 minutes . . . Charge Rates 8. FT-817 Internal Charge Rate -- 160 to 200 mA (13.8-15.0 Volts) 9. FT-817 Internal Trickle Charge Rate -- 12-14 mA . . . Charging Guidelines 10. NiMH Charge Rate -- Charge to 1.2 to 1.4 capacity = 2080 mAH 11. Maintenance Charge -- 1/20th to 1/50th capacity = 45 mAH . . . Charging Calculations 12. NiMH Charge -- 2080 mAH/175 mA = 11.88 Hours; 11 hours, 53 minutes 13. Maintenance Charge -- 2080 mAH/12 mA = ±150 Hours = 6 days, 6 hours |
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