Owner's manual

Section 2: Operation
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2.3. FRONT PANEL KEY FUNCTIONS, CONTINUED
2.3.1. LEGENDS
 Several different legends display on the LED screen.
 While most are self explanatory, the following items are defined.
CZ (Center of Zero).
RECHARGE
 Battery power is low and will require recharging soon.
 The RECHARGE legend displays when the input voltage from the Battery
Accessory 2830 falls below a threshold of approximately 5.4VDC when using
Accessory 2802, or 5.32VDC when using Accessory 2880.
2497
CAUTION
Battery surfaces get very HOT during recharging.