XPost: misc.phone.mobile.iphone
From: V@nguard.LH
Chris wrote:
> I've got round to connecting my ipad to my Windows with 3uTools and found
> the battery have 99% health.
>
> So that's good confirmation that any further issues won't be down to the
> battery.
I could find no mention how 3utools measures battery health. In fact,
there is little info on anything in the tools suite. Measuring by
voltage is not a valid indicator of a battery's health. Since coulombs
cannot be measure for the battery's capacity, about the only other
method is to record and graph the discharge and charge rates over many
discharge/charge cycles. However, that is only an indicator of battery
health, and still does not measure capacity (coulombs).
A battery that charges to 100% may still only provide a small portion of
a good battery that has far more capacity. A 100% battery could drain
in a couple hours because it has less capacity versus a 100% good
battery that takes days to drain until the same loads.
Other than some vague "health" measure, does 3utools actually define how
they measure health? Without a history measuring charge and discharge
info, such "health" measures are worthless. Just measuring charge rate
(amperes times seconds) would indicate coulombs, and keeping a history
would be needed to determine if capacity is waning, and by how much
(because all batteries wane in capacity over time). The voltage across
the battery does NOT measure capacity.
Some mobile devices let apps query the charging rate, some don't. If
not, amperes cannot be measured which means capacity cannot be measured.
Since often charging is perform when the battery has been drained to
different levels, a history is needed to graph charging rate at
different start points.
Does 3utools provide any information on how they measure capacity, or is
"health" some nebulous measure that might be based solely on voltage?
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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