The problem is not the battery pack. It is in the electronic over current circuit that prevents a possible overheating of the battery pack. My unit will run for 10 - 15 seconds and then shuts off. The over current sensor is reset by moving the power switch to the "OFF" position. If you turn the vacuum back on it will run for a few more seconds before shutting off again. There is a small circuit board in the vacuum that contains the over current protection circuit. It uses an NXP Semiconductor HEF4001BP quad 2-input NOR gate. If you are good at soldering you might try replacing this chip. Otherwise, buy a new vacuum. The problem is not in the thermal circuit breaker located in the handle. I have bypassed the breaker and the problem still occurs.
SOURCE: My Eureka Easy Clean 2 in 1 model 109 cordless
first you would check the cord to assure there are no cuts or damage to the cord this can cause this situation as well as where the cord goes into the unit having been pulled by the cord would also cause this same situation following this you would then follow to where the cord goes into the machine and check the terminal connections to the motor itself as well this is basicly a power issue and you would resolve that issue by finding which piece is where the power stops if you were to take a voltage meter and measure the amount of current going into the motor if the motor has none then you know that your problem is before the motor and most likely in the cord if you have any further questions message me back and please remember to rank this opinion it allows me to help others in similar situations in the future. Also if the unit is still under the 1 year warranty on this unit do not attempt to repair you would void your warranty if you did. Instead contact either the place you bought the unit or message me back and I can look this information of how to contact the manufacturer Thanks again for using fixya
Rick
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