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Following the correct charging and discharging methods for your cordless woodworking tools can enhance the life of the battery and save you from buying expensive replacement. First thing go through the instruction manual on battery care. Not all chargers are the same. For example, DeWatt designs several of batteries and chargers in such a way that the battery can be left on the charger for maintenance and equalization cycles. How To Charge Li-ion Batteries 1. Li-ion Ryobi RB18L40 batteries like partial discharges. You do not have to wait for them to fully discharge. Top them up whenever you get the chance. 2. Li-ion batteries like partial charges. You don’t have to charge them till 100% before using them. In fact, they go through maximum wear and tear and stress when charging 90-100%. By charging them to less than full capacity you will extend their life. 3. Li-ion batteries do not like complete discharge. Do not discharge below 20% when you can help it. Stop using the tool when it shows signs of weakening in power and slowing down. Re-charge the battery at this point. 4. Do not charge or discharge in very hot conditions like over 40°C. 5. Do not leave the Ryobi P780 battery in the charger for very long after fully charged. 6. Discharge a Li-ion battery periodically. They have a shelf life and they stay active for longer when kept in use. 7. Charge to 30-40% before storing. Note: A lot of cordless woodworking power tools don’t have a built in battery meter that shows the amount of charge left in the tool. Even the ones that do give a rough idea. Not like the exact percentage that we are used to seeing on our computers and smart phones. So its difficult to tell when the Ryobi P109 battery is 20% or 90%. You will either have to use an external meter. They can be found cheaply online. Or as we have mentioned, just stop using the tool when it slows down and put the battery on charge.
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