Sony PHA-3 Help Manual page 57

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Battery life
Analog connection: Approx. 28 hours
Digital (balanced) connection: Approx. 5 hours
when using the headphone amplifier at 1 mW + 1 mW output (24 Ω). Time may vary, depending on the immediate
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environment or conditions of use.
Note
The charge will continue for about 10 hours, then the timer function of the charge protection circuit will stop the
charging. If you want to continue charging, disconnect and reconnect the micro-USB cable.
When the headphone amplifier had not been used for a long time, it may take a while for the POWER/CHG indicator
to light up in red. In this case, do not disconnect the micro-USB cable from the headphone amplifier. Wait until the
POWER/CHG indicator lights up in red.
Charge the battery in an ambient temperature between 5 °C to 35 °C. If you try to charge the battery outside this
range, the POWER/CHG indicator may flash in red, but the battery may not be charged.
When the battery is full, the POWER/CHG indicator may not light up in red.
When storing the headphone amplifier for a long time, avoid a place subject to high temperatures. When storing the
headphone amplifier for more than a year, charge the battery every six months to prevent over discharge.
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Copyright 2014 Sony Corporation
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