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[-] Wizard_Pope@lemmy.world 140 points 9 months ago

There is a metal strip inside that gets narrower on one side and as it gets narrower the resistance increases and once you press both sides it gets in contact with the battery terminals and current flows through. The lower the remaining battery capacity, the less the wide part of the strip heats up. Over the top is a heat activated colour strip thingy that shows how much of the strip is heated and thus approximately how much juice is left in the battery.

[-] Cort@lemmy.world 21 points 9 months ago

Lol, so checking the battery actually used up some of the remaining juice?

[-] fuzzy_feeling@programming.dev 32 points 9 months ago

always has been.

[-] BCsven@lemmy.ca 21 points 9 months ago

To measure is to change ---science class

[-] ChaoticNeutralCzech@feddit.de 16 points 9 months ago

If it didn't use power, it could remain on all the time.

There is pretty much no way around this. All voltmeters use power (although digital ones use their own source and draw very little from the measured voltage) but this one consumes more than most.

I think they could make one with some LCD or electrochromic display (both use a negligible amount of power) but it might be too expensive to include on each battery. Also, the voltage to state-of-charge relationship is not a simple one: discharged batteries’ voltage will rise back when not in use but the internal resistance had gone up so they no longer allow discharge at a practical current. The little heater test accounts for this, an LCD or ECD does not.

[-] jol@discuss.tchncs.de 8 points 9 months ago

Isn't that obvious? How elae would it work? Its not like electricity is like a fluid you can check the level of.

this post was submitted on 25 Mar 2024
877 points (100.0% liked)

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