Makita · DUR190/DUR191 Trimmers
When you press the check button on the battery cartridge, if all indicator lamps are blinking, it suggests a potential malfunction with the battery itself.
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Remove the battery cartridge from the tool.
Try charging the battery again to see if the issue resolves.
If the issue persists, try a different, known-good battery cartridge.
If other batteries work, the blinking battery may need to be replaced.