One of our Toto TEL5DSC faucets has to have batteries replaced every couple weeks, but none of the other 3 we have do. Toto is no help, and we have replaced just about every part, to no avail
Plumbing - Toto
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Answers & Comments
You might try to Isolate cause by exchanging faucet head (sensor) with one of the other units.
Suggest using a "DC" capable current probe to observe battery drain and compare good and bad units. See following probe;
https://www.lowes.com/pd/Southwire-Digital-600-Volt-Truerms-Ac-Dc-Clamp-Meter/1001002506
With the probe you'll be able to determine results immediately instead of waiting 2 weeks for pass/fail.
Comment here for further assistance.