That's right. The straight line. If you have the same car battery being used for other things like UPS etc., at home, you can use that as well. You can easily fix a Ryobi battery that is in sleep mode by giving it tiny charge boosts. Cells in parallel only affect the amp-hour of the battery and affect how long the battery will last. Touching the red probe to the positive (red) terminal and the black probe to the negative (black) terminal, read the voltage shown on the multimeter. To charge a 40V battery, you will need a voltage source of 40V. I would shoot for a surface voltage of 10-volts, remove the wires from the charger, put the battery back together without the screws and attempt to charger. Note: Remember to unplug the charger before connecting and disconnecting the jumper wires. This happens when you pretty much run the battery empty when using the tool and fail to recharge it afterward and leave the battery in the tool. I recommend buying a proper charger for newer batteries to extend the battery life. Just keep repeating the "pulse" boosting and testing the battery until it will finally be recognized by the charger and you get the green light. Learn more about battery internals at this link. I've been an avid hobbyist in these fields for over 7 years and I enjoy sharing what I've learned in a way that's geared for beginners and those just getting their foot in the door with small engine repair and prepping. On his retirement, he started a remodeling and home repair business, which he ran for several years. For the rest of you? -Randy. With that done, you need to check the overall voltage of the battery by using a multimeter as seen in the picture below.Notice how the voltage of the tower in the picture above is lower than that of the picture below. You heard me right. Once it's charged, take it off the charger. RYOBI 48V Brushless 30 in. 50 Ah Battery Electric Rear Engine Riding So what is the verdict, to leave your battery on the charger, or not?Table of ContentsCan You Leave A Ryobi Battery On A Charger?Why Can't A Ryobi Battery Be Left on the Charger?How Lithium-Ion Batteries WorkHow Charging a Lithium-Ion Battery WorksDos and Don'ts of Ryobi Battery RechargingDODON'TConclusion. Either way you put your battery in the charger and all you get is a flashing red light, which according to the label on the charger means your battery is defective.
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