macbook prossd
I have a rescued mid-2013 11 inch MacBook Air working great off external USB 3 hard drive but missing its internal SSD.
They use a custom SSD, which seem to be expensive even used and aftermarket.
Are any adaptors available to install a generic SSD?
I Googled and thought I found that they do now exist, but then I realized the ones I found were the opposite, for using the SSDs from various MacBooks in other laptops etc.
MacBook Airs ship with either Toshiba or Samsung MLC SSD drives.
No SSD drives are fail-safe.
Lifespan of an SSD drive depends on what wear levelling techniques are employed by the manufacturer and the operating system and what exactly a user does with his/her computer. There is no reliable figure.
My own view with SSDs (as it has been with hard drives) is prepare for the worst and backup regularly. Take advantage of the manufacturer's warranty should a drive fail.
Apple's documentation states that the battery of the Macbook Air performs just like the batteries of the Macbook Pro:
The built-in battery of your MacBook, MacBook Pro or MacBook Air is designed to deliver up to 1000 full charge and discharge cycles before it reaches 80 percent of its original capacity.
In addition, Adaptive Charging reduces the wear and tear on the battery giving it a lifespan of up to 5 years.
During this lifespan the batteries will have a fast charge to 80% of the current battery capacity (2-3 hours). [source]
Do not leave your Macbook plugged in all the time. The battery juices need to move from time to time. It's recommended that you charge and discharge the battery at least once per month.
Temperature: Keeping your Mac at room temperature (22°C/72°F) is ideal.
Long Term Storage: Apple recommends that you store the battery with a 50% charge, if you are not planning on using it for at least half a year.
The innovation in the design of the battery of the Macbook Air was not about increasing capacity, but about the ability to manufactures them very thin. The batteries of the Macbook Air are located towards the thin end of the Macbook Air.
Best Answer
See this question: Do MacBooks support NVMe SSD drives via the use of a Sintech adapter?.
There is the Sintech adapter. It is not compatible with NVMe drives on your Mid-2013 MacBook Air, but you can use AHCI drives. They are a bit cheaper than official "Apple" drives ($0.66/GB against $0.86/GB for the cheapest drives).