WILL NO CHARGE - Electrolux Pronto 2-In-1 Stick/Hand Vacuum - Cayenne

always charge any item that comes with its own charger that way you can not damage it by trying to charge it another way.
there is always other ways to charge things up but its best to use what it come with (more so for safety reasons)

Most likely your battery needs to be replaced.
It's probably doing a "false charge", it's like having a rechargeable D-cell but internally only the equivalent of a AAAA-cell is working, only a more extreme version of this situation.
It would charge up very quickly but also discharge very quickly and not really power anything.
The charger doesn't realize that it's only taking seconds to charge the battery, it's just checking if the voltage is up to a full charge level.

This means your battery is flat. When charging the battery if the green light on the charger is on then charge is getting to the battery. If the battery isn't holding a charge then you will need to replace the battery.

Of course. So charge it depends on the limited time of your battery.

It could not be making good contact with the charger.Check the contacts on the unit and the charger-sometimes the connectors get bent or something is stopping the circuit to complete. Wiggle the device while it is on charge and try to make the light stay on.

How long are you letting it charge for? It's also possible the battery is defective, or there is a short in the vac.

How old is it. An older battery sometimes just don;t take a charge. I have things that I leave plugged in all the time and it;s ready to go when i need it and yes they do charge when needed.

mcdevito75 here, I believe a full charge would be 4--6 hours, but wait until battery needs the charge, to charge a battery with an already half charge or better could shorten battery life.

Its the battery cell, its dead and unable to hold a charge. you will need to purchase another cell.

Like all batteries after a while they go bad/will not hold a charge. especially the kind that is always plugged in/always charging, like electric shavers, cordless vac and so on.
get a new battery

thanks for rating