Vaisala HM40 - Manual (Page 10)

9
Batteries
The HM40 is powered by two AA-size batteries. You can
use the following battery types:
- Alkaline (IEC-LR6)
- Lithium (IEC-FR6)
- NiMH (IEC-HR6)
Do not mix batteries of different types. Both
batteries must be of the same type.
Observe instructions storage and operation
instructions of the battery manufacturer.
Alkaline batteries are the standard choice in non-
rechargeable batteries. They are a good match for the
power requirements of the HM40.
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 lithium-ion batteries, which cannot be used in
the HM40.
NiMH batteries are rechargeable, and available from
Vaisala as an option. For order codes, see section
Accessories and Parts on page 40. Instructions for using
the optional USB charger are provided in section
Charging on page 10.