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My guess, brevity in issuing instructions.

Instructions are often shortened in this way, often to save space.

MaroldThis sentence is to be found on the top of a Samsung battery which supplies my mobile phone.

This sentence is to be found on the top of a Samsung battery which powers my mobile phone.

"Please refer to a manual before using a battery."

But this would be gramatically more correct, right? In formal writing I would be forced to use this sentence that I have constructed?

I did not know that it is possible to omit articles for such purposes without hurting a native's ear (brevity for issuing instructions). So you say it is natural for you to see this w

AnonymousThis sentence is to be found on the top of a Samsung battery which powers my mobile phone.

Thanks a lot. I was looking for this word, but it simply slipped out of my mind.

I think it's acceptable to say that a battery supplies a device. It's clear that what's supplied is voltage (or power since the amperage draw is usually fixed for the device).

deadratI think it's acceptable to say that a battery supplies a device. It's clear that what's supplied is voltage (or power since the amperage draw is usually fixed for the device).

That's a stretch and not natural.

GIYF. 100K hits for "battery supplies voltage" and "battery supplies power." Over 1M hits for the plural.

deadrat100K hits for "battery supplies voltage" and "battery supplies power." Over 1M hits for the plural.

Unfortunately I couldn't get any hits for 'battery supplies X (where X is a device such as a mobile phone) unless they were followed by 'with ...'

That's as may be. The claim is that it's an unnatural stretch to understand that "battery supplies device" means that the battery supplies voltage or power to the device.