wireless chargers
if you do any research on Lithium batteries and the best charging conditions you will see that this is extremely complex. Higher end Lithium batteries are full of sensors and circuitry that do things like monitor battery temperature and charge relative to capacity and regulate the charging pattern to keep these under control and maximize battery life.
In many cases, when people say that their phone's battery don't last as long now as before it is because of accumulated background tasks - they have added more and more apps, or apps have started doing more in the background - so the battery usage has gone up. Sometimes, doing a "factory restore" and then reinstalling apps will help especially if you are careful and only reinstall apps that you actually use.
As for the "battery app" you mention, unless it came from Google and was designed for the Pixel phone you are using then I wouldn't trust it - it has to have been designed for your exact battery hardware, and communicate with the battery's on-board electronics, to be of any value.
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Panasonic Lumix DMC-FZ40
Canon PowerShot S110
Canon EOS 7D
Canon EF-S 10-22mm F3.5-4.5 USM
Canon EF-S 17-55mm f/2.8 IS USM
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