Laptop not used in over a year, bad battery?

[yabot]

Hi guys,

I went travelling September 2015 and returned a few days ago. I thought that when i lifted the lid on my early 2013 15 retina mbp i'd be dead as dead could be, however it turned on with 40% charge?! However since using it the last couple of days the battery has been really crap, like i mean it barely lasts 2 hours, my dad reckons its just because it hasnt been used in a while, and needs charging and draining a few times....?battery health yesterday was at 75% and 775 cycles, today battery health is at 85%.

Do i need a new battery or should it 'get better',

cheers guys.

 

[Samuelsan2001]

Hi guys,

I went travelling September 2015 and returned a few days ago. I thought that when i lifted the lid on my early 2013 15 retina mbp i'd be dead as dead could be, however it turned on with 40% charge?! However since using it the last couple of days the battery has been really crap, like i mean it barely lasts 2 hours, my dad reckons its just because it hasnt been used in a while, and needs charging and draining a few times....?battery health yesterday was at 75% and 775 cycles, today battery health is at 85%.

Do i need a new battery or should it 'get better',

cheers guys.

No way they know that mate you might get lucky you might not.

 

[TheRealAlex]

Hi guys,

I went travelling September 2015 and returned a few days ago. I thought that when i lifted the lid on my early 2013 15 retina mbp i'd be dead as dead could be, however it turned on with 40% charge?! However since using it the last couple of days the battery has been really crap, like i mean it barely lasts 2 hours, my dad reckons its just because it hasnt been used in a while, and needs charging and draining a few times....?battery health yesterday was at 75% and 775 cycles, today battery health is at 85%.

Do i need a new battery or should it 'get better',

cheers guys.

Lithium Ion chemically degrades over time so what was once 100% eventually becomes 85%

 

[elf69]

If been stored for a while I would give it 2-3 charge cycles then see if it recovers runtime.

Year is quite a while for a battery to be dormant.

my 2009 macbook has 92% health with 391 cycles.
But is used everyday and was by last owner too.

 

[yabot]

thanks for the reponses. any idea how much it costs to replace and how long it takes? i might do it myself and get the parts from ifixit if its really expensive.

 

[AlanShutko]

It looks like Apple charges $199 to do a replacement on a retina MBP: https://support.apple.com/mac-notebooks/repair/service/pricing