Sony CD-UX71 Operating Instructions Manual page 100

Symptom
The charging indicator is
not displayed.
The charging indicator
disappears in the middle
of charging.
" " or "
flashing instead of the
remaining battery/
charging indicator.
The battery life of the
rechargeable battery is
short.
100
GB
Remedy
You are not using rechargeable battery.

Rechargeable battery has been inserted with incorrect

polarity.
"USB CHARGE" of "DETAIL MENU" is set to "OFF" in the menu. To

charge the battery using your computer, set it to "ON. "
While playing back messages using the built-in speaker, you

cannot charge the battery.
Rechargeable battery other than NH-AAA has been inserted.

The rechargeable battery has deteriorated.

While playing back messages using the built-in speaker, you

cannot charge the battery.
" is The environmental temperature is out of the range for

charging. Charge the battery in an environment with a
temperature of 5 °C - 35 °C.
You are using the rechargeable battery in an environment

with a temperature of under 5 °C. Charge the battery in an
environment with a temperature of 5 °C - 35 °C.
The IC recorder has not been used for a certain time. Charge

and discharge the rechargeable battery using the IC recorder
several times.
Replace the old one with new rechargeable battery.

The remaining battery/charging indicator is displayed only for remaining battery/charging indicator is displayed only for

a short time, however, the rechargeable battery is not charged
completely. It takes about 4 hours to fully charge exhausted
battery.
indicator is displayed only for