The same value keeps appearing in the datasheets of rugged laptops and tablets: an operating temperature range of −20 °C to 60 °C. Taken on its own, this line is easy to skim past – yet in practice it determines whether a device runs reliably at all on a construction site in winter, in a vehicle cab in summer, or under direct sunlight. This article explains what the range specifically means, how it differs from storage temperature, what cold does to the battery, why heat in a vehicle or in the sun is often more critical than frost, and how temperature affects charging capability and screen response.
What the temperature range −20 °C to 60 °C specifically means
The value "operating temperature −20 °C to 60 °C" describes the ambient temperature range in which a device can, according to the manufacturer, be switched on and used in normal operation. In the Laptop comparison table, this information is listed as its own row, "Temperature in operation at -20°C to 60°C". For the Durabook S15, Durabook S14I and Durabook Z14I models this row is confirmed with a checkmark, whereas for the Durabook S15AB it is not stated. In the Tablet comparison table, the same information applies to the R11L, R11, U11I and R8 models, while it is likewise not stated for the R10.
On the individual product pages, the same range is confirmed in body text: for the Durabook R11, it states that the device can "be used in a temperature range of -20°C to 60°C". Identical wording appears on the pages for the Durabook R11L, the Durabook U11I and the Durabook R8. The range −20 °C to 60 °C is therefore not a general marketing claim, but a specification listed individually per model, which is not documented identically for every device in the range.
It is also important to note: this range is not the same width for every rugged device. For some models in the range it is narrower, and for others wider, than −20 °C to 60 °C. The Getac T800, for example, states an operating temperature of −21 °C to 50 °C, while a range of −29 °C to 63 °C is given for the Getac ZX80, the Getac S510 and the Getac S410 G5. Several Fieldbook models such as the Fieldbook RC300, the Fieldbook P80, the Fieldbook N80G2, the Fieldbook N101G2 and the Fieldbook P101, in turn, state an operating temperature of −20 °C to +60 °C – exactly the range this article is about. Anyone selecting a device for a particular operating climate should therefore not assume a single "standard value", but should check the specification of the relevant model.
Operating temperature and storage temperature: the difference
Operating temperature and storage temperature are two different specifications that are frequently confused. Operating temperature describes the range in which a device can be switched on and actively used. Storage temperature, by contrast, describes the range in which a switched-off device may be kept without damage – for example in a car boot, in a warehouse, or during transport. For all the models checked in the range, the storage temperature is considerably wider than the operating temperature.
This is specifically documented for the Getac T800: "Temperature: Operating: -21 °C to 50 °C, Storage: -51 °C to 71 °C". The device may therefore be exposed to considerably colder or hotter conditions as long as it is switched off during that time. It is similar for the Getac ZX80, the Getac S510 and the Getac S410 G5: all three state an operating temperature of −29 °C to 63 °C and a storage temperature of −51 °C to 71 °C. For the Fieldbook models Fieldbook RC300, Fieldbook P80, Fieldbook N80G2, Fieldbook N101G2 and Fieldbook P101, the storage temperature is stated as −30 °C to +70 °C in each case, with an operating temperature of −20 °C to +60 °C.
The gap between the operating and storage ranges varies among the models checked – around 10 °C on each side for the Fieldbook devices, and around 20 to 30 °C for the Getac models named above. In practice, this means: a device left in a vehicle overnight in severe frost while switched off usually still remains within the permitted storage temperature. Before switching it on, however, it should approach the operating temperature – starting a device straight out of extreme cold at full load is not the same as starting a device that has already warmed to within the permitted operating range.
What cold does to the battery
At low temperatures, the battery is usually the most sensitive component of a mobile device. Chemical processes in battery cells slow down in the cold, which can reduce the power available in the short term and the usable capacity – an effect that reverses as temperature rises and does not have to be permanent damage, as long as the device stays within its stated operating temperature. For field use in the cold, it is therefore relevant how a device handles a possible drop in battery performance.
This is where features come in that are listed in the Laptop comparison table and the Tablet comparison table under the "Battery" category. According to the table, the Durabook S15, Durabook S14I and Durabook Z14I laptops optionally offer hot-swappable batteries as well as a bridge battery with a five-minute swap time; this is not stated for the Durabook S15AB. Among the tablets, the bridge battery is optionally available for the Durabook U11I and the Durabook R8, but not, or not in the base configuration, for the Durabook R11L, Durabook R11 and Durabook R10. A swappable battery with a bridging function allows the main battery to be replaced without shutting the device down – a practical way to maintain continuous operation, especially in cold conditions where the actually usable battery capacity can drop compared with warm conditions.
The plain "main battery runtime" figure from the Laptop comparison table – 12 hours for the S15, 10 hours for the S14I, 12.5 hours for the Z14I and 13 hours for the S15AB – refers to manufacturer figures under standard conditions and cannot automatically be equated with runtime in frost. Anyone working regularly at low temperatures should therefore focus less on the plain runtime figure and more on the availability of a swappable or bridge battery.
Why heat in a vehicle or in the sun is more critical than frost
In public perception, frost is often seen as the greater strain on electronics – in practice, the opposite is often true. A device started up cold initially operates in a throttled or somewhat sluggish state, but remains functional within its specified lower limit. If, on the other hand, the upper limit of the operating temperature is exceeded, the internal electronics throttle performance more heavily or shut down to protect the components – and this upper limit is reached considerably faster in closed vehicles or under direct sunlight than many people expect.
A vehicle parked in the sun in summer can reach interior temperatures far above the outside temperature – particularly on the dashboard or behind glass surfaces, where devices are often placed or permanently mounted in docking stations. A device with an upper operating limit of 60 °C, as applies to the Durabook S15, S14I, Z14I and the R11L, R11, U11I and R8 according to the comparison table, can reach its limit faster in such a scenario than in winter frost. Models with a higher upper limit, such as the Getac ZX80, the Getac S510 or the Getac S410 G5, each at 63 °C, offer more headroom here, but they too are not unlimited in their heat resistance.
For outdoor use in forestry and agriculture, where, according to the Forestry and agriculture industry page, devices are designed "to MIL-STD-810G and IP64+" and feature a "sunlight-readable display", direct sunlight is a constant accompanying factor. A sunlight-readable, anti-glare display also adds to the housing's heat absorption when devices lie or operate unprotected in the sun for extended periods. Anyone using devices in a vehicle or under direct sunlight should therefore pay attention to adequate ventilation and, where possible, shading, rather than focusing solely on the cold limit of the specification.
Charging capability and screen response at extreme temperatures
Charging a battery is likewise temperature-dependent. The charging process itself generates additional heat in the cell; at already high ambient temperatures, this additional warming can cause a device to slow down or pause charging in order to protect the cell from overheating. Conversely, at very low temperatures the charging process itself can be restricted or delayed until the cell reaches a temperature range better suited to charging. In both cases these are protective mechanisms, not malfunctions – one more reason why a device with a swappable or bridge battery, as optionally available for the S15, S14I and Z14I as well as the U11I and R8 according to the comparison table, offers a practical advantage for continuous operation at extreme temperatures: an already charged spare battery can be swapped in without having to wait for a full charging cycle under unfavourable temperature conditions.
The display also responds to temperature. At low temperatures, the response time of liquid crystals slows down for physical reasons, which can show up as somewhat sluggish touch or image-refresh behaviour; at high temperatures, brightness or contrast can noticeably decrease before the device's actual shutdown temperature is even reached. For outdoor use in strong sunlight, display brightness is therefore relevant alongside plain temperature resilience: for the Durabook R11 and the Durabook R11L, an optionally orderable 1000-nit display is documented, likewise for the Durabook U11I, and an integrated 800-nit display for the Durabook R8 – in each case with the addition that this allows good working conditions even in direct sunlight. No documented display heating against cold is available in our own range for the current models; this claim is therefore deliberately not made here.
Temperature range as a selection criterion for the deployment location
For device selection, it is worth comparing the actual deployment climate with the documented operating temperature of the relevant model. For anyone working mainly in a temperate climate or indoors, the standard range of −20 °C to 60 °C – as it applies to the Durabook S15, S14I, Z14I, R11L, R11, U11I and R8 – is generally sufficient. Anyone who regularly works in a vehicle under direct sunlight, in heated workshops adjoining cold areas, or in regions with particularly high summer temperatures, finds a wider range of −29 °C to 63 °C with models such as the Getac ZX80, the Getac S510 or the Getac S410 G5.
For outdoor use in forestry and agriculture, as described by the Forestry and agriculture industry page, dust, moisture, vibration and changing temperatures frequently occur together. The combination named there of MIL-STD-810G ruggedness, a dust- and jet-water-protected housing and a sunlight-readable display supplements the plain temperature specification with further factors that are just as relevant in the field as the temperature range itself. A complete technical overview with all values per model is provided by the Laptop comparison table and the Tablet comparison table.
Frequently asked questions
Is −20 °C to 60 °C the same for all rugged devices in the range?
No. This range is confirmed for the Durabook S15, S14I and Z14I according to the Laptop comparison table, and for the R11L, R11, U11I and R8 according to the Tablet comparison table. This row is not stated in the comparison tables for the Durabook S15AB and Durabook R10. Other models, such as the Getac T800 (−21 °C to 50 °C) or the Getac ZX80, Getac S510 and Getac S410 G5 (−29 °C to 63 °C in each case), deviate from this range.
Why is the storage temperature wider than the operating temperature?
Because a switched-off device generates no heat from its own operation and has no active electronic processes running that react sensitively to extreme temperatures. For the Getac T800, the storage temperature is −51 °C to 71 °C compared with an operating temperature of −21 °C to 50 °C; for the Fieldbook models named above, it is −30 °C to +70 °C compared with −20 °C to +60 °C in operation.
Does the battery permanently lose capacity in the cold?
A drop in capacity at low temperatures is a known, usually reversible effect that reverses again upon warming, as long as the device stays within its specified operating temperature. For continuous operation in the cold, several models offer an optional swappable or bridge battery, see the Laptop comparison table and Tablet comparison table.
Why does the screen respond more slowly in the cold?
The response time of liquid crystal displays is physically temperature-dependent and slows down at low temperatures. This effect affects the screen refresh and, in part, touch response, but it is not a defect as long as the device stays within its permitted operating range.
Are sunlight-readable displays the same as heated displays?
No. A sunlight-readable display – such as 1000 nits on the Durabook R11 and R11L, or 800 nits on the Durabook R8 – improves readability in direct sunlight. Active display heating against cold is not documented for the current RobustBook models in our own range.
Why the Temperature Range Depends on the Model
The range −20 °C to 60 °C is stated as the operating temperature for several rugged laptops and tablets in the RobustBook range, but it is not a universal value: the Durabook S15, S14I, Z14I and the R11L, R11, U11I and R8 carry it according to the comparison table, the Durabook S15AB and R10 do not, and models such as the Getac T800, Getac ZX80, Getac S510 and Getac S410 G5, or the Fieldbook series, deviate from it with their own, sometimes wider, ranges. What matters in practice, beyond the plain figure, is above all the difference between operating and storage temperature, the noticeable effect of cold on battery performance, the often underestimated risk from heat in a vehicle or in the sun, and the interplay between charging capability and screen response at extreme temperatures. Anyone selecting a device for a particular climate should check the specific specification of the relevant model rather than relying on a generic value.
If you have questions about the right operating temperature for your specific application, the RobustBook team will be happy to help you choose the right model.