Can a Ryoby Lithum battery can be repair or rejuvenate?

Check the battery level and if low add distilled water to the max fill point. You could also try purchasing a Battery MINDer charger to help remove sulfated conditions within the battery, but this process is lengthy and may or may not work. If this doesn’t help rejuvenate your battery, it may need replaced.

It's called rejuvenating. Yes, it can extend the life of an old, dead battery, but not for long. If the battery will take a charge, it might work. Until it doesn't.
You know that motorcycle batteries are recyclable, don't you? When you buy a new one, they give you a discount for returning the old one. New batteries generally work a whole lot better than old, rejuvenated batteries.
a few bucks
a few bucks less

Waste all the liquid inside, and add again new electrolite at 5 % of Sulfuric acid.The electrolite for Batteries you can find at Cars Battery Stores.The electrolite contains destilled water and 5% sulfuric acid.
Work this carefully and with gloves.

Is the camera turned on; okay simple question but sometimes that is all that is needed. Look in the battery compartment is it clean, does it have battery corrosion? Sometimes the wires in the battery compartment become corroded thus not making a connection. If so a CLA will be needed.

Do not try this since the charging circuit for lithium batteries are different than nicad! Improper charging of lithum batteries can cause a fire.

hi ,
you do need a battery as its a hydrostatic transmission and cant be push started .

your batteries have possibly developed a memory and are probably shot or it may be the charger local toolstore should be able to test them both.Which ever one is bad it will cost more to buy a charger and battery than it will to buy a new drill .whatever you do ask the shop people how to stop the battery from developing a memory or if you want to come back to me when you have them fixed up I will be happy to tell you.please let us know how you get on ,thankyou

Charge via your computer - takes 3-4 hours