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https://zentalk.asus.com/en/discussion/comment/103037#Comment_103037
I forgot where I read the same information. Li batteries are most comfortable between the 20% - 80% range.
My previous phone was Oneplus 6. Before owning Oneplus 6, I always kept phone plugged in most of the day so battery is almost always above 80%. And every phone's battery started to degrade rapidly after 1 year...I thought this was normal. But by the one year mark, I usually pass the phone to someone else so this did not matter to me much.
Then, I bought Oneplus 6 and read the 20-80% range information. So, for Oneplus 6, I mostly kept it around that range. I used Oneplus 6 for 2 years and battery degradation was MUCH less than all the other phones before it. I was planning to keep using it but I dropped it one night and its screen broke.
Because I need a phone urgently and did not have a backup phone, I purchased ROG 2, which I have been interested for a long time but the price was a bit too high for me, especially when the Oneplus 6 was still working well. Anyway, in the end, I bought ROG 2 despite the high price...was going to wait for ROG 3 but the lack of earphone jack turned me off.
In summary, keep your batter between the 20% - 80% range most of the time. It REALLY does make a difference!
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Here is the thing, I am using my battery to 100% without overcharging it. May be after 1 year or 1 and 1/2 half year, my battery capacity will degrade to 80%. However, your battery capacity is 80% from day 1 as you are charging your battery to 80% only. That means your battery is already degraded by yourself. Then what is the use of 6000Mah battery if you are using it like 4800Mah battery.
If I am getting 9 hours of SOT from day 1, you will be getting 7 hours of SOT. After 1 year may be I will be getting 7 hours of SOT AND you will be getting 6.5 hours of SOT.
SO HOW DOES THAT INCREASE YOUR BATTERY LIFE?
