<!-- from fixya rte -->How do you know when the battery is charge - Dyson DC35 Handheld Vacuum

It sounds like the battery is shot. It might have sat too long with a dead battery. Don't know how long it sat in the store before it was purchased. You might need to contact Dyson and ask if you can get a replacement battery.

I'm far from a Roomba expert and only clicked on your question out of curiosity given my background and as there was a similar question earlier Id passed.

A little research... Roomba NiMh battery pack is 14.4 v full charge. NiMh charging is a bit complicated, suffice to say it will eventually go well over 16V.

I would expect the charging station to have an initial charge voltage in excess of 12.5V. What I don't know is if its always on or waits to see if a load (roomba) attaches and then turns on its output.

So if you measured the power, contacts on the charger with a voltmeter and you get better than 12V likely its good, but really need to know what the voltage is when Roomba (with nominal battery pack) is docked.

Its likely the battery pack in the Roomba has a bad cell and will need replaced. You could measure the battery voltage but likely its low from not taking a charge. If its 14+ then the charger is working and the Roomba is misreporting.

If you're sure the battery contacts are clean and the battery really is charged, then there is faulty circuitry within the Roomba that would have to be repaired or replaced.

Confirm that the battery is inserted with the metal contacts down so they make contact with the spring terminals in the battery compartment.

Visually confirm that the metal contact plates on the battery pack, and the spring terminals in the battery compartment are clean and shiny. If not, wipe with a clean cloth or paper towel, its OK to use a little water or rubbing alcohol on the cloth, if needed, and then dry it.

Visually confirm that the metal contact plates on the Roomba, and the spring terminals on the docking station's home plate are clean and shiny. If not, wipe with a clean cloth or paper towel, its OK to use a little water or rubbing alcohol on the cloth, if needed, and then dry it.

If you have a volmeter, measure the voltage between the contacts on the battery pack If it isn't something in the neighborhood of 14 volts and is 11 volts or less, the battery isn't fully charged.

Reinstall the battery.

For the moment, please connect the power adapter directly to the Roomba rather than the docking station to eliminate one possible faultly connection.

If the battery wasn't fully charged, or you weren't able to test it, try to charge the Roomba and then retest the battery voltage if you can. If the battery voltage was higher immediately after charging, but didn't get to 14 volts, the charger is good, but battery needs to be replaced. If the battery voltage was unchanged after attempting to charge the Roomba, the charging circuitry may be faulty. If there was no light patterns when you tried to charge it, and it was plugged in to a good outlet, then the power adapter or charging circuitry is definitely bad.

If you have no voltmeter and you cleaned the contacts and tried to charge the Roomba and it works, use the Roomba and then recharge using the docking station and see if it was just dirty contacts or it won't charge through the docking station. If it didn't work, you'll need to figure out if its the battery, the charging circuitry in the Roomba, or the power adapter. If there are no lights when you try to charge the Roomba, then Either the power adapter or the Roomba power circuitry is defective, but without a voltmeter you can't find out which one, and there's no way to know if the battery is good or bad, but you know Roomba wasn't trying to charge it. If there are lights when you try to charge the Roomba, then at least you know the power adapter is good. Unfortunately, without being able to test something there's no way to distinguish between a charger that won't deliver a charge to the battery and a battery that won't accept a charge. If you want to take a guess then a bad battery is more common and less expensive to fix.

charge it after use ,, allow the battery to go down almost fully , then charge it . this will prolong the life of the battery

Does it stop working real fast ?

Is the charging cord defective, meaning there could be a broken wire inside the insulation?

The battery may be fully charged, but it sounds as if the service life of the battery is done. If you could measure the battery voltage from turn on to quit, it would likely go from full voltage to near zero almost instantly. If you know someone else with one of these machines, try swapping batteries for a check. Good luck!

Can not believe NO ONE could answer this.

The R1 resistor basically drops the 9V to around 5V for charging the battery pack. The resistor is a 10 ohm , 2 watt resistor. The other resistor is 220 ohm. This only limits the current to the LED.

The 10 ohm resistor burnt because the battery pack was left to sit too long without use and charging. So the cells shorted causing excessive current through the resistor when you attempted to charge the batteries.

After replacing the resistor, you will need to replace the battery pack before charging. Otherwise, you'll just burn the resistor again.

Generic works fine, and that charger does too. If your charge light and dock light are on then you'll be okay.
Save cash, go generic!

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.