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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.
Either the charger is bad or the batteries are too old. If the batteries are allowed to go dead completely the 24 volt charger will not recover. You'll need to seperate the batteroes and use a 12 volt automotive charger to charge the batteries. Make sure the 12volt charger is able to charge gell cell batteries. Not all will.
please post the problem clearly with full details like phone model/ actual problem (error message), what you have tried etc.
check the charger, some nokia phone deny the charging with duplicate charger, check the battery as the same is also a reason of non charging, incompatible battery will not charge in cellular, check the charger jack, if this all not work then you have toreplace battery connector or 47K resister (for nokia).
The batteries may have bad cells that will not allow a full charge. This can happen if the scooter has been stored for a while or if the charger has remained connected 24-7 for a long time.
Try replacing the batteries; cycle them 1-2 times to ensure they will take a full charge. (This means run the battery down into the red before you put it on the charger for 8-12 hours.)
There are basically 3 types of chemicals currently being used for cell phone and laptop batteries. Ni-cad, Ni-mh and Li-ion. There is a fourth makineg its way in Li-ion polymer. A couple things are consistent for all types of batteries no matter what chemical is inside. You must initially give the battery a 12-14 hour charge on the home charger. (Don't use a cigarette adapter for the first charge. This conditions the battery and don't take it off the charger that first time even if the charging indicator says it's full after 3 hours. Also the manufacturer's also state to run it thru 3 charge cycles. What that mean's is that you fully charge and fully drain 3 times. 1 full charge + 1 full drain = 1 charge cycle. Here's where the way you charge the battery starts to differ.
Ni-cad: Mostly only on older devices, has a "memory" effect, should be drained before a full charge is put on it, should be removed after overnight charge or can be overcharged and burnt out.
Ni-mh: Still used for some devices, has slight memory effect but not enough to have to fully drain before the recharge, should not be consistently left on charger after full charge that can eventually burn out battery and shorten usage time.
Li-ion and Li-ion polymer: Used on a lot of newer devices, has no "memory" effect, should be recharged as often as possible, actually likes to be charged and draining it regularly can cause the usage time to be shortened, can NEVER be overcharged so whenever you're near a charger put it on there. Besides those benefits a li-ion battery is lighter and smaller but the chemical can hold more charge than Ni-cad and Ni-mh.
So the one reply to your question said to error on the side of draining the li-ion batteries. This is incorrect information. You want to charge the battery before it gets below a 20% charge. Also batteries will not go bad from accidentally doing the incorrect charging procedure here and there but normally follow the correct procedure. One last note try to use the home charger more often than the cigarette lighter charger for best long term results. Cigarette lighter chargers do not give a full charge (about 95%) which in the long run can damage any type of battery listed.
What you need to do is go onto Ebay and get a universal cell phone charger, and another battery. The universal charger plugs into the wall and directly charges the battery, without the phone's charging port. With an extra battery you can create a cycle so that you never have to wait for a battery to get done charging. This is what I do since my enV broke, and it works well. Just don't try it if you're impatient, because it takes roughly 12 hours to charge to full power.