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Is your battery a LiPo (Lithium?) If so ... These special batteries are charged by a computer circuit that holds the charge amperage constant and adjust upward the charging voltage until the required battery voltage is reached. At this time the charger hold a constant voltage and decreases the amperage as the battery capacity is "topped off". the charger circuit charges the entire battery at once but monitors each cell (cells are about 3.7 volts each) and controls the charge so that all the cells are ballanced.
When one of the cells that makes up the battery starts to go bad, the ballance circuitry prevents over charging the others, so one weak cell hold all the cells back from full charge and better charger circuits will signal you with an led or such that the battery is' going' bad.
the power system has been interfered with,i won't use a complicated language but i need you to try and use an adapter,if it doesn't work it means the transformer has a problem or it has failed completely and it needs replacement
If a portable, could be no charge or bad battery---output voltage is marked on the charger and can be tested with a meter---if voltage and battery are good (most units will work with the charger hooked even if battery is bad) then the unit has either a damaged jack where charger connects or has a power supply problem inside it.
After a while even rechargeable batteries loose the ability to hold a charge. This process accelerates when the battery is allowed to lie completely discharged for long periods of time. NiCad batteries especially have this issue. If you left the battery sitting for long periods without occasionally charging it, it losses the ability to hold a charge. It appears you are going to have to either do without the battery or replace the pack. I would take out the old one, it will eventually start to corrode and leak and if its still in your machine it will cause damage.
If you get a new battery pack make sure you charge it fully and then depleat it completely before recharging it.
hope this helps.
take a voltmeter and test charger or borrow a known good one from a friend if you know anyone who has one , sounds like bad charger word--- it is much better to run all rechargeable devices mostly all the way down before recharging as these batteries will do what is know as establish memory and will shorten battery life do not leave on charge except when charge is needed