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6.5.2. BATTERY CHARGE
The instrument is not designed to operate when the charger is connected. The measurements must be made using battery
power.
The battery charger of the device is in two distinct parts: an external power supply and a charger built into the device.
The built-in charger manages the charging current, the battery voltage, and the internal temperature of the battery simultaneously.
This optimizes charging while guaranteeing a long battery life.
The day before you use your device, check its charge condition. If the battery level indicator shows less than three bars, charge
the device overnight (see §1.2).
The charging time is approximately 6 h.
In order to extend the life of your battery:
Use only the charger supplied with your device. The use of another charger may prove dangerous!
Charge your device only between 10 and 35°C.
Observe the conditions of use and storage stated in this data sheet.
A new battery reaches its full efficiency only after several complete charging/discharging cycles. This will not however prevent
you from using your device when it has been charged for the first time. However, we recommend making the first charge a full
charge (at least 7 hours).
If the device indicates that charging is over, it is perfectly acceptable to disconnect the charger for a few seconds, then reconnect
it to top up the charge.
Like any rechargeable battery, the one in your device is subject to significant spontaneous discharging, even when the device is
off. If your device has not been used for several weeks, it is probable that the battery will be partially discharged, even if it had
been fully recharged just before going into storage.
In this case, before using it again, you should fully recharge the battery (at least 7 hours).
The longer your battery is stored, the more it is discharged. After three months’ storage of the battery without periodic recharging,
the battery is probably fully discharged.
Possible consequences are:
The device fails to start unless supplied by the external charger.
The device loses the date and time (it returns to the 1st of January 1998).
Set the switch to OFF; charging is possible when the device is not off, but will take longer.
6.5.3. OPTIMIZE BATTERY CHARGING
During charging, the temperature of the battery rises substantially, especially towards the end. A safety device, built into the bat-
tery, checks constantly that the battery temperature does not exceed an acceptable maximum. If this maximum is exceeded, the
charger switches off automatically, even if charging is not complete.
The battery is at the bottom of the device, and the evacuation of the heat can be facilitated by placing the device upright while
charging. The battery temperature is then lower and it will be charged more fully.
This precaution is especially important when the air temperature is high (in summer).
6.5.4. LIFE BETWEEN CHARGES
The mean battery life depends on the type of measurement and on how the device is used. Approximately:
16 h if the automatic switching off function is deactivated,
24 h if the automatic switching off function is activated,
How long your device can operate when the battery is fully charged depends on several factors:
The consumption of the device, which depends on the measurements you make,
The capacity of the battery. It is greatest when the battery is new, and declines as the battery ages.
