[OnePlus 5 Guides, News, & Discussion] dlads:
I highly doubt that ThinkPad is as good as it was.

Yea you can keep using the device for years, but the battery will have suffered.

If you have a phone that's running low because you didn't charge it overnight then lol your phone had a problem, like I said you should lose very very little charge overnight 0-2%

Proof? Phones are all different, your devices will vary between what you buy, some will have better stamina than others even if it's the same model, some dissipate heat better, some are freakishly great for battery or just don't seem to degrade over time compared to others, that's quite normal.

I can only talk about my experiences.

I used to work a lot with phones as well as all types of kit, always get phones for free etc.

One of the devices i had was for transferring any data between any two devices.

This had a large lithium battery in it, I never unplugged it for about 1 year (and this was worth over £2k back in 2015)

It was a mobile device so I didn't need to charge it, same or superior capacitors as a mobile device.

Over time what I noticed was the SIM slot which was external, started getting harder to fit the SIM into, eventually it was impossible, then I noticed the device was getting larger, so I popped one of the screws out of it and the other ripped open.

The battery which was about the size of a phone initially had easily tripled in size, it'd never been wet or mistreated besides being charged for a long period of time, the battery was close to exploding, this was an extremely high grade battery in professional kit.

Also used to work in a phones where the phones are constantly charging (only on 0.5 and 1amp chargers which is what you wrote regard as trickle today)

Nearly every single phone began to show symptoms of degradation after about 4 months, after six months to a year most phones were unusable, not all but a lot.

The worst affected were Nokia, Sony and Samsung, iPhones, LG and HTC were the least affected but also showed symptoms after time, sometimes the same phone would exhibit issues whereas an identical phone would not.

Symptoms included but not limited to:

Unresponsive screen

Inability to hold a charge

Random reboot

False touches on screen

Audio anomalies

Completely dead unit

Unable to charge

Freezing

You get the point, also over the years my wife hasn't listened and charges overnight and after the year or two years we're into our contracts my phone always has the better battery, same with friends and family.

I appreciate that some of these examples are extreme but if you're consistently charging overnight then I'm sorry but you're still doing something very similar and over a period of time this will 100% have an effect on your battery, it's not a case of if it's a case of when.

You're putting your phone in the hands of capacitors and also the hope that the excess heat won't damage the battery.

It's completely your call and your phone, Google it, don't Google it.

You're wrong if you think charging overnight for years doesn't affect the battery, end of story.

I've met people like you who have their heads firmly in the sand and to be quite honest I haven't the inclination nor the effort to attempt to change your mind.

Let's see who has the better screen on time in 2 years, at the moment I get between 8 and 11 hours.

My OnePlus 5 I was able to achieve 14 hours over two days, I have a thread called screen on time leaderboard.

Have a look, all stats and screens are listed.