Disadvantages on not using a fast charger?

[ajo]

A while back I set up my mums iPhone 11. While I was setting it up and transferring everything it said that it had to be plugged in. I don't know what I was thinking but I didn't realise that I could have just used the old charger. Maybe this was packed away with the old phone but anyway, it set up ok without being plugged in and I went out and got the 20w charger so the supplied cable could be used.

Now that the chargers aren't supplied and the newer ones are fast charging, is there any disadvantage to the phone, like the battery health, on not using a fast charger (apart from the speed)?

Thanks

 

[ian87w]

There's no disadvantage on not using a fast charger other than slower charging speed. In fact, some people prefer the slower charger to prolong the battery health in the long run.

When charging overnight, imo there's no point in fast charging.

 

[now i see it]

The smaller chargers won’t heat up the battery as much when charging on hot days, so they’re actually preferred in the summer when you’re not in an air conditioned room.
The only downside to a smaller charger is it takes longer to charge the battery. That’s it. They’re not detrimental at all. (Probably better for the battery)

 

[velocityg4]

Just takes longer.

The smaller chargers won’t heat up the battery as much when charging on hot days, so they’re actually preferred in the summer when you’re not in an air conditioned room.
The only downside to a smaller charger is it takes longer to charge the battery. That’s it. They’re not detrimental at all. (Probably better for the battery)

I wonder if that's been tested in detail? While I know heat can reduce recharge cycles. I wonder how much effect the temperature difference between fast and slow charging has on modern batteries. Plus how magnified that effect is on charging habits like 0/100, 20/80, 30/70, &c.

 

[now i see it]

It doesn’t matter significantly in a cool room, but I know from experience that charging an iPhone with a 12 watt charger (iPad charger) instead of a 5 watt charger when it’s over 95°F makes my iPhone so hot it’s too hot to hold - that’s not good for the battery. Battery temp gets over 107°F.