Plug in A/C adaptor to ubit and with unit off, see if you can get a voltage measurement from the terminals that connect to the battery. If voltage is present, dead cells in battery. If no voltage present, suspect switching regulator. These units are hard to service due to parts availablity and cost of a replacement unit vs shop labor and parts charge.
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I suggest to purchase another brand , PROTRON no longer on the market , it belongs now to SPECTRONIQ,and their customer service is very bad, they will tell you that the BATTERY replacement is out of stock at the moment but its on order , Ive been like this trying to get a replacement for my PROTRON for about 3 years !! AJ
nahh you cant over chargee silly;; when its done, its done, it just
doesnt loose battery power. and im not positive about the light.. but i
would most likely assume that when the green light is on, that means
its charging.. thats how pretty much every electronic works.. light
on-charging; light off-no charge. sometimes it varies by different