Vaisala SHM40 - Manual (Page 35)

Chapter 4 ____________________________________________________ Using the HM40 Indicator
VAISALA _______________________________________________________________________ 33
Lithium batteries are a good choice if you need the longest battery life or
best capacity in low temperatures. Lithium batteries are not rechargeable.
Do not confuse them with rechargeable lithium-ion batteries, which
cannot be used in HM40.
NiMH batteries are rechargeable. Two NiMH batteries are included with
the USB recharger that is available from Vaisala as an option. For order
codes, see section Spare Parts and Accessories on page 61.
Battery Life
Typical operation time that is achieved with alkaline batteries is
100 hours. The operation time will be shorter if the display backlight is
used, and if the operation environment is cold.
NOTE HM40 does not automatically power off when it is not used. To conserve
batteries, turn the meter off when you are not using it.
Charging
The optional USB charger (Vaisala order code 229249SP) provides a
convenient way to charge two NiMH batteries from any powered USB
port (for example, from a laptop computer).
1. Place the rechargeable batteries in the charger and plug it into a
USB port. The blue LED on top of the charger starts to blink.
2. When the LED stops blinking and stays on, the batteries are
charged. The charging time is several hours for two fully
discharged NiMH batteries.
If you are not using a Vaisala-supplied charger and rechargeable
batteries, read and follow the manufacturer’s own charging instructions.
WARNING Do not attempt to charge non-rechargeable (alkaline or lithium)
batteries! Doing so leads to a risk of battery leakage, equipment damage,
and risk of explosion and/or fire.