What is the quality of the MacBook Pro replacement battery?

No battery lasts a really long time Its a consumable! So it will wear out.

The lifespan of a battery has more to do with how you use your system. If you can try keeping your system plugged in and don't let the battery get to low or fully drained as that burns a recovery cycle.

The quality of battery also has an impact. The expression you get what you pay for holds true! Cheap batteries ar the ones that are often that have failed Q/C or are cheap knock-offs. The seller is also important how long have they been around and what is their warranty and return policy.

That's fantastic! However, your cycle count is extremely low for two years. Must be because you leave it plugged in a lot. It doesn't run down and get recharged nightly as many people do. Batteries get used up from cycling BUT leaving them plugged in or running them to shutdown is supposed to reduce battery life. Your use defies that concept. Food for thought. Enjoy your battery life!

~Same here, for Simplo manufactured replacement. I'm pretty sure they just use aftermarket controllers, with new battery cells and reset the charge cycles count.

I got one that looks exact genuine, one guy told me it is and i got it for 45$ the battery had the same 2015-03-06 date, though it did not hold charge long i got ir refunded and went to another store. Same one but this guy told me its compatible not genuine same price. Date was the same year and month, that just died in a week and got it swapped. Rhis one is 2015-02-21. It uses the same chips apples ones uses but all three of these batteries are reporting charge and capacity incorrectly.

Im down 33 cycles and the max capacity keeps bouncing from 8200-8600 depending on the load or when i connect or disconnect a charger like mac os will show say 85% charging if i discconect it may show 87% and if i reconnect quickly it may show 83% or even 89%.. How is yours holding up?

Im in India. A bit of searching turns out these batteries come from china or korea and are sold on aliexpress, many do purchase these and can even change the names or reset the cycle.

I allegedly got an apple battery but coconut also shows Simplo as the manufacturer. Using apple 'about this mac' gives a serial number that implies apple manufacture.I am guessing, as someone else said, they are buying up exhausted real apple batteries, replacing cells and then selling as new. It, at brand new, lasts 4-4.5 hours just reading email and a couple of forums. Also it shows a maximum capacity that is well below of what coconut shows is capable of. I clearly got ripped off. Just talked to the guy who put it in, he is willing to give me my money back and take the battery back. Says he will put the old one back in if he can find it. I am then going to pay apple to do this as I need more than 4 hours of battery time. Sigh. Unless there is a reliable vendor for GOOD replacement batteries.

I have the answer to the mystery of your battery being 1703 days old: It was manufactured in 2016 when Apple discontinued having batteries made for earlier Mac models. We have a late 2013 MacBook Pro. We tried using a Simplo battery in 2019. It had a 2016 manufacturing date, as well. It died quickly. We replaced it with a battery from OWC, macsales. That one lasted 15 months and we ran it about 450 cycles. Still not great. Next installing an ifixit battery. Hoping for better performance.