Even though one battery measures a much lower voltage than the rest, in most cases all three cells will be almost completely drained.
The battery type supplied with TankMate sensors (Lithium Energizer L91) has a starting voltage of 1.8V, not 1.5V. The battery voltage will stay close to 1.7V for most of its life, and then drop off very quickly.
So if any of the Lithium cells read between 1.5V - 1.6V on your multimeter, it is actually almost dead.
It's also best not to mix battery types, or even old with new. It can cause issues like cell leakage, and makes the battery monitoring impossible. You can run the R3 unit on 3 x lithium L91 (as supplied), or 3 x alkaline. DEFINITELY NOT heavy duty/long life cells.
Was this article helpful?
That’s Great!
Thank you for your feedback
Sorry! We couldn't be helpful
Thank you for your feedback
Feedback sent
We appreciate your effort and will try to fix the article