A larger battery can help field workers, but capacity in mAh does not by itself establish operating time. Screen brightness, signal strength, scanning, GPS and temperature can change the result. An ODM battery request should begin with a measured workload.
Build an energy profile
Record minutes of screen-on time, call duration, data uploads, camera use and navigation over a representative shift. Test in poor-signal locations as well as at a desk. Note when charging is actually possible and whether a vehicle mount or dock is part of the plan.
Define the design tradeoff
Ask how a battery change affects device weight, thickness, charging time, service procedure and any published protection rating. Verify the exact battery configuration and charging accessory in the quoted sample. Do not transfer runtime figures from a different model or workload.
Set a pass rule
Agree on a minimum end-of-shift charge reserve and test several shifts. Record temperature, network and app versions with the result. This produces a more useful purchasing decision than an unsupported promise of “all-day” operation.
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