> 5.2 | Operating Temperatures

> Table 24: | Board / battery temerature

> Parameter | Min | Typ | Max | Unit
> Normal operation | -30 | +25 | +70 | °C
> Restricted operation 1 | --- | --- | +70 to +75 | °C
> Automatic shutdown 2 Temperature measured on TC65 board Temperature measured at battery NTC | -30 -20 | --- --- | +80 +60 | °C

> 1
> Restricted operation allows normal mode speech calls or data transmission for limited time until automatic thermal shutdown takes effect. The duration of emergency calls is unlimited because automatic thermal shutdown is deferred until hang up.
> 2
> Due to temperature measurement uncertainty, a tolerance on the stated shutdown thresholds may occur. The possible deviation is in the range of ±3°C at the overtemperature limit and ±5°C at the undertemperature limit.

> Table 25: | Ambient temperature according to IEC 60068-2 (without forced air circulation)

> Parameter | Min | Typ | Max | Unit
> Normal operation | -30 | +25 | +65 | °C
> Restricted operation 1 | --- | --- | +65 to +75 | °C
> Automatic thermal shutdown 2 due to TC65 board temperature due to battery temperature | -30 -20 | --- --- | +65 +60 | °C

> 1
> Restricted operation allows normal mode speech calls or data transmission for limited time until automatic thermal shutdown takes effect. The duration of emergency calls is unlimited because automatic thermal shutdown is deferred until hang up.
> 2
> Due to temperature measurement uncertainty, a tolerance on the stated shutdown thresholds may occur. The possible deviation is in the range of ±3°C at the overtemperature limit and ±5°C at the undertemperature limit.

> Table 26: | Charging temperature

> Parameter | Min | Typ | Max | Unit
> Battery temperature for software controlled fast charging (measured at battery NTC) | 0 | --- | +45 | °C

> Note: See Section 3.3.4 for further information about the NTCs for on-board and battery tem perature measurement, automatic thermal shutdown and alert messages.
> When data are transmitted over EGPRS or GPRS the TC65 automatically reverts to a lower Multislot Class if the temperature increases to the limit specified for normal operation and, vice versa, returns to the higher Multislot Class if the temperature is back to normal. For details see Section 3.4.