Will 70W charger shorten battery life in a M2 MBA?

[MiniD3]

Hi Guys
My mid 2014 MBP has got to the stage where my adobe apps won't update any more
all I really need is a MBA for travel

As you would be aware, there is an offer for 35W or 70 W chargers

The fast charge sounds good, but will the 70W charger shorten the batteries life?
Regards,
Gary

 

[Isamilis]

I tried charging with 70w and 35w, the battery health was up and down slightly, but usually it dropped after using 70w charger. So, probably it will affect but not significant.

 

[T'hain Esh Kelch]

No.

 

[MiniD3]

I tried charging with 70w and 35w, the battery health was up and down slightly, but usually it dropped after using 70w charger. So, probably it will affect but not significant.

That sounds positive !
............ Gary

 

[MiniD3]

No.

Great news!
........... Gary

 

[1096bimu]

Hi Guys
My mid 2014 MBP has got to the stage where my adobe apps won't update any more
all I really need is a MBA for travel

As you would be aware, there is an offer for 35W or 70 W chargers

The fast charge sounds good, but will the 70W charger shorten the batteries life?
Regards,
Gary

It absolutely will in theory, but this is not something you'll be able to just "notice" as a user of a single machine, way too many variables, way too small of an effect to just notice.

An easy solution is to just get the 70w but don't use it unless you need fast charging, for any other time just use a 20w or something like that.

 

[MiniD3]

It absolutely will in theory, but this is not something you'll be able to just "notice" as a user of a single machine, way too many variables, way too small of an effect to just notice.

An easy solution is to just get the 70w but don't use it unless you need fast charging, for any other time just use a 20w or something like that.

Great Idea,
Thank you,
Regards,
Gary

 

[Jay Tee]

It absolutely will in theory, but this is not something you'll be able to just "notice" as a user of a single machine, way too many variables, way too small of an effect to just notice.

An easy solution is to just get the 70w but don't use it unless you need fast charging, for any other time just use a 20w or something like that.

Well, I tried experimenting and, yes, the iphone 15plus is down to 98% at 65 charge cycles, after about two weeks of consistent 70W charging in conjunction with the 80% limit. I had hoped iOS would manage the heat during fast charging to mitigate capacity loss, but, no, it doesn't.

I have another 15plus that's used nothing but the Apple's bread-and-butter 20W adapter, and that's still maintaining 100% capacity after close to 200 charge cycles.

Stick with the 20W charger for iPhone battery's longevity, and only use the 70W in emergencies.

With my M3 MBA, the 70W's a charm.

 

[roadkill401]

I think is is utter nonsense speculation. Here are my reasonings

1. the power delivery management provides far better current control than past power charging protocols have. So just because it was a problem in the past doesn’t make it relevant today

2. if you actually hooked up a PD monitor to the charger cable you’d see how it actually does fluctuate the power getting delivered quite substantially. The 35w charger does charge at the full 20v just a lower amp rate than a 70w model that can go up to 20v3.5a. But when charging it rarely gets up that high. I found it stays more around the 20v 2.3a or round 45watrs.

3. most of the damage happens around the 80-100% so the life of the battery is already be saved by not filling it full all the time

4. if you really want to save your batteries then you will get far more bang for the buck putting on a thermail transfer pad to keep the battery cooler during charging than the amount of current going in. Heat kills (and current generates heat so if you can keep it cooler you can push more current with no adverse effects )

 

[Jay Tee]

After another month of using the 70W charger on the 15+, battery capacity has remained at 98%. The phone's remained much cooler during charging without its case.

 

[MiniD3]

Having no problems with charger/phone/ etc
Nothing getting hot !