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Sorry i wrote wrong, "While if i plug the battery, it reach 5v that is very low value i think co" here i should have said that it reach 5v when i connect the device to the usb charger, multimeter indicate 5v. Battery are 2x 3.7v 18650 litium I have tried to remove that white protection, but...

i have took the measure on the +/- of the battery: and uscually is 0v indicated on the multimeter. While if i plug the battery, it reach 5v that is very low value i think considering that the light indicator show 3/3 lights and mean that the bettery should be fully charged. i did resistence...

This handheld vacuum cleaner broke, I would be curious to fix it but I don't know how to do it...looks very simple inside and for it i would be curious to try: it was nearly fully charged (2/3 on it) but during the work time, it went off suddenly...I thought I heard a little "poof" before...