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Hi, I have a Dyson DC56 with a lithium battery for about 18 months and I leave it plugged into it's charger when not in use. I do notice the Dyson charger seems to switch off automatically when charged. I don't have any problems so far. It you have a Genuine Dyson Lithium battery and the genuine Dyson charger it should not be a problem. That is because Lithium batteries have very precise requirements for their charging cycles and therefore the correctly designed charger required to make them work safely is a somewhat intelligent design and needs to be of good quality in having to meet those requirements. So use the original Dyson Charger. Also most high current Lithium Batteries will also have a protection circuit built in further increasing safety and reliability. Just don't use cheap cloned Chinese made Lithium chargers, because you will never know if they have been designed or even will operate correctly.
Now if you have old technology Ni Cad (Nickel Cadmium), LA (Lead acid) or NiMH batteries with basic cheap chargers they should not really be left connected to a charger full time.
I don't have one of those but I'd guess if the charger was bad the batteries might be bad from being charged incorrectly. I would try to charge and discharge a few times and see if things improve. If they are lithium batteries that probably won't help and only chance is to replace the battery pack.
1) replace again the batteries by new ones and completely charged. 2) test the charger if if functioning properly, can be faulty, and not charge well the batteries. 3) test the power supplies inside from the scuba, to due some short circuit drain the batteries. God bless you
If you have your receipt, check with Ryobi to see if it is still under warranty. It comes with either a 2 or 3 year warranty, depending on when it was purchased. If it is still covered, get it replaced/repaired. If it is not, buy the P117 charger. $30 at Home Depot. It has a 90 day satisfaction guarantee. If it charges your batteries properly, you're good. If not, bring it back if you don't like/want it. My P113 won't get out of test mode now, or charge Lithium batteries anymore. So I bought the P117 yesterday. Works great, and it's a lot cheaper than new batteries! And it has a 3 year warranty.
Sounds like you bought a defective battery You can test for this by removing the battery
and holding the power button for 15 seconds. This will restart the
charging cycle as if the battery were new. If it still goes red get a refund and a new one.
far as i know the dyson dc 16 root 6 vacuum uses a lithium ion battery with a charge of 21.6 volts. it could be that either your battery isnt storing the right amount of power anymore and you may need to replace it. check on the specifications to confirm how much volts the battery is supposed to have. too little volts may be enough for things like lights to switch on, but not enough for the motor to start up.
Remove the battery, hold down the POWER button for ten seconds, then put the battery back in and charge overnight. If it still tells you it's out of power as soon as you start it, it's time for a new battery. http://store.irobot.com