There is no in-built cut-off system in the Badaptor – it’s simply a battery adapter that allows users to convert their DeWalt 18-20V, Makita, Milwaukee, Bosch Professional, Ridgid or AEG 18V battery for use with the full range of Ryobi One+ power tools.
When using Lithium-Ion batteries, they should never be drained completely as this can cause damage and prevent them from working. With an 18/20V system, the batteries should not be discharged below 14V.
With most tools, when the battery voltage drops to around 16V, the tool’s speed and performance starts to fall off. At 15-14V the drop in performance is severe and it is obvious that the battery needs recharging.
We would recommend the batteries are recharged when the performance starts to fall off as this will extend battery life, protect the battery from deep discharge (also known as over-discharge), and also maximise tool life as it is working at the correct voltage.
Earlier Ryobi batteries did not contain over-discharge protection as Ryobi fitted this within their tools. The newer One+ Ryobi batteries do contain over-discharge protection.
Ryobi continued to fit over-discharge protection in their tools to support backward compatibility with the older Ryobi battery system. However, we have recently been made aware that new tools, such as the Ryobi garden tools, no longer have over-discharge protection fitted.
Currently, some brands of batteries do contain over-discharge protection, and some do not. Batteries or tools that do contain over-discharge protection will switch off completely before the tool slows down too much. A battery and tool combination without protection will continue to operate at an increasingly slow speed.
To protect your battery, do not continue to operate if the tool performance has noticeably reduced.