Elecraft KXBC3 User Manual download pdf (Page 4)

The KXBC3 charges at 200 mA throughout the charging time set, suggesting that 2000 mAH cells would be

charged in 10 hours (referred in battery literature as a C/10 rate). However, the charging process is not 100%

efficient, so additional charging time must be added, typically 20%. So a fully depleted 2000 mAH battery

would require about 12 hours to reach full capacity.

The charging time must be adjusted for batteries of different capacity as follows:

Charging Time (hours) = 1.2 X (cell mAH rating) / 200

For example, to charge fully depleted 2500 mAH cells: 1.2 X 2500 / 200 = 15 hours (Set charger for 16 hours)

Protective Circuits

In addition to monitoring the requested charging time, the charging system monitors the battery temperature,

battery voltage and the power supply voltage. An error message will appear when you are in the

BAT CHG

menu or when the battery is charging in Power-Off Pending Mode (pg 3) if any of the following conditions

exist:

Error Message Description

NOT 0-40C

Battery temperature too high or too low. If this occurs when trying to start a charging cycle,

tap any switch to clear the message. If this occurs during a charging cycle, the charging

cycle will resume automatically when the condition is corrected.

LO SPPLY

The external power supply voltage is too low for charging the internal battery. If this occurs

when trying to start a charging cycle, tap any switch to clear the message. If this occurs

during a charging cycle, the charging cycle will resume automatically when the condition is

corrected.

BAT ERR

Battery missing or battery voltage out of range due to a fully charged pack or a defective or

missing cell. With the KX3 on, tap any switch to clear the message. The charging cycle is

terminated (does not restart automatically when the condition is corrected).

SYS FLT

KXBC3 system fault. With the KX3 on, tap any switch to clear the message. The charging

cycle is terminated (does not restart automatically when the condition is corrected).

Changing Battery Types

If you wish to replace the NiMH batteries with a different type, first turn the charger off;

1. Hold MENU to enter the menu and turn the OFS/VFO B knob to select BAT CHG.

2. Turn the

VFO A knob to select CHG OFF.

Leave the charger off until such time as you replace the battery with NiMH cells.

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Elecraft KXBC3 User Manual Page 4