Until early 2015 I was involved in a battery reconditioning shop in Korea. Please understnad I have experience with Korean customers.
The rating rule of a "good" battery should be remembered when you begin to consider the operability of a battery. The battery remnant capacity of les than 80% is NOT in good state. it works maximum 4 hours which is not good for a 'normal' shift work.
But this battery can be utilized by a small work load company who works less than hours or lighter work load. Problem is many reconditioning companies are not so frank to share with the 'sound ' information. If you have a honest reconditioners, you can enjoy the benefits. I hope this experience may help someone.