XPost: misc.phone.mobile.iphone   
   From: scharf.steven@geemail.com   
      
   On 3/6/2023 12:18 PM, VanguardLH wrote:   
   > 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?   
      
   3uTools is sketchy. Their web site is no secure. Not sure what country   
   it's based in, but you see a large number of spelling and grammar errors.   
      
   I suspect that 3uTools looks at the maximum battery charge percentage   
   and your battery cycle count and tries to guesstimate the battery health.   
      
   There is also iMazing  which you can install on   
   your computer. They don't say how they determine battery health on the iPad.   
      
   --- SoupGate-Win32 v1.05   
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