[Nexus 6P Q&A, Help & Troubleshooting] SMARTPHONEPC:
Are you still using AccuBattery, when my N6P battery gets replaced in the coming days I plan to follow their recommendations whenever practical. If you're getting >5 hrs SOT now charging to 100% then charging to 80% could get you > 4 hrs SOT assuming proportionality potentially doubling the enclosed battery's life (to even quadrupling it if "charging it to a maximum of 80% every time") according to AccuBattery-links below. If circumstances demand more SOT I will unplug it at 100% rather than leaving it plugged in as much as possible out of a short term concern for maximizing uncorded SOT (at the longer term expense of battery degradation). I have a lot of great external batteries these days as backups but hope to depend on them less with healthier battery practices particularly as quick removable batteries continue to become increasingly rare.

https://www.accubatteryapp.com/single-post/2016/07/21/Test-blog

"Most of us know what is necessary for a healthy lifestyle. We should follow a balanced and nutritious diet, get enough sleep, exercise regularly and avoid alcohol and smoking. But if I were to ask you what you need to do to keep the battery on your portable devices healthy, most -if not all- of us would have no clue.

We don't really give our batteries too much thought: we plug it in when the battery is low and wait until it is fully charged, sometimes leaving it plugged in the charger overnight so that we have a full battery the following morning.

However, leaving it plugged in when it has already hit 100% is the absolute worst thing that you can do to your battery.

To start off, let's go into the effects that charging inflicts on the battery. We all know that batteries wear down and lose capacity over time. Although there are many factors that influence battery wear, for the sake of brevity and simplicity we will highlight two factors that have a considerable effect on battery capacity over time and that is the effect of voltage and 'topping off your charge'.

Overcharging

Research tells us that a battery sustains considerable damage to its capacity when it is overcharged. The reason for this has to do with the chemical processes taking place in the battery during the charging process. Although all phones have an internal circuit that stops the charge process when it hits 100%, power voltage still trickles in when the charger is still plugged in. This affects the oxidative stability of certain chemicals which in turn leads to a decrease in battery capacity over time. If you want to know more on the science behind it all, click here.

'Topping off your charge'

Did you know that you can actually quadruple your battery's usable lifetime by charging it to a maximum of 80% every time, instead of charging it to it 100%.

Huh, really? How come?

That comes from the fact that the wear your battery sustains in the charging process is not a continuous, linear process. In our test case of a Moto G, the battery sustained more battery wear charging from 80% to 90% (battery wear=0.22 cycles) than from 50% to 60% (battery wear=0.02 cycles). In both cases it is a 10% increase in battery charge but

charging from 80% to 90% caused 11 times more wear to the battery than charging from 50% to 60%

.

Unplug on time.

So,

if you want to have a longer battery life it is important to cap your maximum charge to 80%. But if you do need to charge to 100% then make sure to unplug when it is fully charged to avoid overcharging.

Maintaining good battery health is even more important nowadays when many smart phone manufacturers are pushing out mobile phones with non-removable batteries.

Without the option of replacing the battery cannot be replaced so optimising battery performance so your battery goes with you as long as you possibly can."

https://accubattery.zendesk.com/hc/en-us/articles/210224685-Getting-started-guide

How do I prevent my battery health from dropping too fast?

"There are lots of scam apps in the Play Store promising to 'fix' your battery. This is of course not possible, however, what is possible is to slow down the speed at which your battery health is deteriorating. AccuBattery will show you how much battery wear each charging session is causing your battery. Research ( https://accubattery.zendesk.com/hc/en-us/articles/210224725-Charging-research-and-methodology ) has shown that keeping your battery charged between 0% and 80% can make your battery's lifespan last 2x longer than when you use a full battery cycle from 0-100%. To help you follow these guidelines we've built in a charge alarm. With the handy slider you can choose at which charge % to get a notification so you'll know that it's time to unplug your phone from the charger. As you play around with the slider you'll notice that when you start charging beyond 80% each percentage of additional charge will coincide with an increasing amount of wear.

https://accubattery.zendesk.com/hc/en-us/articles/209507189-Tab-3-battery-health-screen

"FAQ: My battery health is above 100%

Battery manufacturers usually guarantee at least 300 charge cycles before end of life (~20% capacity loss), to ensure they hit this limit, some batteries have start with a capacity larger than specified on the battery.

There are also manufacturing variation between each batches, the stated capacity doesn't have to exactly match the measured capacity. For example, Sanyo Eneloop Pro's specs are 2550 mAh typical, 2450 mAh minimum, and how much actually fits into you sample depends a bit on luck.

My battery health seems too low

Well, same answer as above - the stated capacity is just a typical capacity for the model, it doesn't have to exactly match the battery you're holding. In addition to the manufacturing variance, all batteries degrade with usage and time..

If you charge once per day, you're expected to lose about 15% of capacity per year, but the exact number depends a lot on the battery chemistry and how you charge it (full charges overnight or only partial charges).

We can't restore lost capacity with an app, but by charging only to 70 or 80%, you can reduce further damage to the battery."

https://www.google.com/search?q=accubattery+charging+to+80%+cycles+in+wear