Is your ryobi 18V battery is a Li-ion battery? if so you can store it with 40% power and keep it clean, cool, and dry. Then every 1-2 month to charge and discharge the battery for once time.
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SOURCE: Ryobi 18V lithium battery won't charge
Hi, Thanks for getting back to me. The yellow and blinking red indicate a defective cell. Since it has lithium cells and is that new any repair to it would be a waste of your time. Ryobi tools purchased in 2008 have a 2 year warranty. I am guessing you probably got it at a home depot and you should return it under the warranty. All new Ryobi tools have a three year warranty. Good Luck! and Thanks for using fixya!
SOURCE: can i charge a 14v battery using a 18v charger (both are ryobi)
Absolutely not. The risk of damage to the battery is only a minor concern compared to the fire hazard you would be creating.
SOURCE: The Yellow and Green light both come on and stay
http://oneworld1.inetu.net/manuals/ryobi/hp1442m_1802m_874_eng.pdf
It sounds like your battery is bad. If yellow and green are on for more
than 15 minutes it probably a defective battery pack. See page 8 in the
manual.
SOURCE: New Ryobi 18v lithium battery goes dead after a
No, just return it, for the money they should give you one that works. It is common to get a defective Ryobi 18v lithium battery. I've had 2 out of 7 purchased that wouldn't hold a charge. But when you get a good one they work awesome!
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SOURCE: Does it harm a Ryobi 18v lithium battery to leave on Charger?
Lithium-Ion batteries require careful charging and temperature monitoring while in the charger. Ryobi's Charging station monitors many functions and shuts off when the battery has gone through a complete charge. This is indicated by a steady Green light. Once the Charge indicator is a steady green the charger stops charging. With any battery It will slowly discharge and I don’t think the Ryobi will maintain a battery that is never removed. For example, if after a complete charge cycle if the battery was left there for 2 years and then you went to use it, it would likely be completely discharged. However if the battery charger is unplugged then plugged back in a new charge sequence would start. I lose power at my house about every 6 months or so. Once power is restored a new cycle would start and the charging cycle begins again.
Hope this helps and have a great day.
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