Charging / Battery Life: Predictive ThermometerUpdated 5 days ago
How to charge it
Put the thermometer in its charging cradle, or in a Booster. The cradle is included; a USB cable and power adapter are not, so use your own USB-C cable and any standard 5V USB port.
A full charge takes about 25 minutes. Even five minutes gets you enough for a long cook.
Avoid "quick charge" and other non-standard USB power supplies. These rely on the device to negotiate voltage, and that part of the industry is barely regulated. A non-standard port can push more voltage or current than expected, and the charger will overheat and destroy itself, protecting the thermometer. It is dangerous, and it smells bad. Use a standard 5V USB port.
One specific warning: some ThermoWorks chargers deliver 12V. That will destroy any Combustion tool. See Warnings and Watchouts.
How long the battery lasts
These are the figures for the 2nd-generation Predictive Thermometer:
| Mode | On a full charge |
| Cooking mode (target temperature set) | up to 90 hr |
| Instant read (out of the charger, no target set) | up to 24 hr |
| Standby, in the charging cradle | up to 40 days |
Quick charge: five minutes gives you about 24 hours of cook time.
On the 1st-generation, cooking mode runs up to 42 hr, and five minutes of quick charge gives about 8 hours of cook time. If you need the instant-read or standby figures for a 1st Generation thermometer, get in touch, and we will confirm them for your firmware version.
A thermometer out of its charger sits in instant-read mode by default. It switches to cooking mode when you set a target temperature, which is also when the longer battery life applies.
How long a Booster keeps it topped up
This one depends on which Booster you have, not which thermometer:
| Booster | Thermometer kept ready for |
| 1st-generation Booster | up to 181 days |
| WiFi Booster | up to 285 days |
When it is asleep and when it is not
The thermometer goes into standby when it is in the charging cradle, and the cradle is not connected to power. That is the state the standby figures above describe.
If you have turned on Always-On Mode, it will stay awake in the charger and use considerably more battery. See Combustion App: Always-On Mode.
Thermometer not charging?
See the Predictive Thermometer: Troubleshooting Guide for step-by-step help, starting with cleaning the charging contact. An invisible film of cooking oil on the metal contact is the most common cause.
Still have a question?
If your battery life is far short of the figures above, email [email protected] and tell us which generation you have, what mode you were in, and whether Always-On Mode is switched on.
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