They have a built in trickle that shuts down after the battery is fully charged, you can leave it forever if you want. We leave ours plugged in overnight. I have one that is always on with a battery in it. Hope this helps.
Thanks Ned! My husband recently passed and we own just about every Ryobi tool ever made. A couple of guy friends told me not to leave my batteries, on the gazillion battery charger.
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Guru is right about the trickle charge but remember, Ryobi batteries, while very good, hate cold weather. They will not charge at all if the battery is below 32 degrees so the trickle charge with slightly discharges and recharges full batteries will not complete the recharge cycle, eventually causing dead batteries. Keep batteries in the house in the winter. The fast charge works great and youll be ready in a flash.
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Ryobi NiCads loose 1% per day after 3 months the cells / battery is dead. NiCad charged sub C cell is 1.2v and should not be discharged bellow 1v. So .2v / .01 is 20 days.
To prevent NiCad memory every 20 days you should recharge your Ryobi battery.
Ryobi Li Ion Zero memory Zero charge loss. So fully charge a Ryobi Li Ion battery and remove it from the charger.
SOURCE: Can I leave my Ryobi P113 charger with a P103
Yes you can that is an automatic charger when it is fully charged it shuts down the charging portion but keeps the charged light lit however this does not effect the battery.
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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SOURCE: NEED A MANUAL FOR A RYOBI BATTERY CHARGER
This link should help in finding a manual. Good luck. http://powertool.manualsonline.com/manuals/mfg/ryobi/ryobi_battery_charger_product_list.html
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