No. There are several factors that could lead to issues when using the incorrect battery.
Built‐in Charging Circuit
Many instruments (including some wattmeters) have a built‐in trickle or float charging system whenever they are connected to an AC adapter or powered externally. This circuit continuously charges or maintains the battery at a certain level.
NiMH cells are designed for repeated charge–discharge cycles.
Alkalines, however, are primary cells and can be dangerous if charged.
Different Nominal Voltages
A NiMH cell has a nominal voltage of about 1.2 V.
An alkaline cell has a nominal voltage of about 1.5 V.
Some devices count on the lower nominal voltage of NiMH cells for proper battery monitoring or low‐voltage cutoff. Using alkalines (especially fresh ones at 1.6 V or higher) could cause calibration or battery status detection errors in certain designs.
Risk of Leakage or Damage
Even if you “never intend” to recharge the meter, the meter’s built‐in circuitry may attempt to apply a charge current whenever external power is connected.
An alkaline battery that is exposed to a charge current can leak or swell, potentially harming the instrument.
Warranty and Safety Issues
The manual explicitly states NiMH only, then using alkaline could void any warranty or liability coverage.
The manufacturer’s safety certifications often rely on following the stated battery type.
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