Question about Ryobi Two 18V Lithium-Ion Batteries + Lithium-Ion Charger Upgrade Combo Pack

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Does it harm a Ryobi 18v lithium battery to leave on Charger?

Does it harm a Ryobi 18v lithium battery to leave it on the charger until you need it? It's been my experience that the NiCads won't last as long if you leave them on the charger but no one seems to have the answer for the lithiums.

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Jeff Bonvallet

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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.

Posted on Apr 01, 2010

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YES, Recharging ANY battery MUST be done as follows... Flatten battery completely... when flat return to charger, leave until the Light indicates full charge. Then use it, If you do not do this it will develop a "Memory" and not charge up properly again. With Li batteries, this is less pronounced but still happens.

Posted on Apr 01, 2010

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  • bobreilly30 Mar 14, 2011

    Li-on batteries DO NOT develop memory,and Li-on batteries are NOT supposed to be run down to nothing.

  • Jeff Bonvallet
    Jeff Bonvallet Mar 15, 2011

    You are correct Bobreilly30. In fact the Ryobi Lithium-Ion batteries have internal voltage monitoring and when they get to a low level they shut off. It is impossible to take a Ryobi Lithium-ion battery completely flat, they simply shut themselves off. If you were able to bring the battery completely flat you risk having some of the cells short. Then when you go to recharge the unit, the remaining batteries will get to much voltage which can cause serious problems including fire. There is no memory issue with Lithium-ion batteries. Check out the chemistry to understand why.
    withhttp://en.wikipedia.org/wiki/Lithium-ion_battery

  • Flatus Gass Jun 11, 2013

    So true. Very irresponsible and bad advice from Chris Bell. People, take all advice with a grain of salt. People, for whatever reason, seem incredibly motivated to give advise, whether they understand all of the current and topical statistics or not. In some cases, that irresponsible type of advice could lead to rather negative consequences. Be smart. Do the homework.

  • Flatus Gass Jun 11, 2013

    Also, what sort of imbeciles are in charge of documentation at Ryobi? There is absolutely no information whatsoever regarding the specifics of when to charge the new Lithium batteries. They go into great to great detail about the chargers, the temperature, ect. But not a single word regarding what experienced users of Li batteries already know. Most people come from a NiCad background, and the fools at Ryobi have done nothing to increase awareness of the very different procedures for the Lithium batteries. Shame on them.

  • Anonymous Jun 17, 2017

    this is all a myth

    Ryobi batteries that are totally dead will not charge at all. there neds to be a trickle in the dead battery. Back 20 years ago this was true. nowadays it's an accepted myth.

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