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hi if youre batteries have been sitting for 18 months without a charge they r probably no good now after batteries sit for a long time the plates develop a coating & when u do charge them the they will not charge properly..youre charger guage is not a true reading the only way Is to use a battery LOAD tester this will give u a true reading on the condition of youre batteries...u can buy a battery load tester of e/bay for aprox $35 ........
There are a several reasons why the Galaxy Note 10.1 is not charging as much.
1. Too many application are turned on (check the task manager)
2. Too many notifications icon are turned on ( bluetooth, gps, wifi, etc.)
3. Plugging your charger using a computer
Are you using the original charger and plugging it into a wall charger?
How long did you use the Note 10.1 previous to noticing the damage? and was it extremely hot at the back?
If so, then maybe the battery isn't picking up from the charger. I've watched back to back movies while still using the charger but this can prove very devastating on the charger's outlet which became extremely hot after 4-5 hours or so of charging continuously. It turns out, the galaxy note 10.1 can withstand 8+ hours of ongoing movies but the charger outlet cannot. *If I didn't unplug it after 4-5 hours, the plug what have fried.
In this case, i believe the charger is more likely damaged than the Galaxy Note 10.1, which is more of a better scenario. Especially, since you charged it for over 24 hours, meaning it's charging something, but very slowly. Operating Galaxy Note while charging can prove detrimental in the charger's outlet and can in fact burn out.
The voltmeter test provides general indicator of battery condition. Check the voltage of the battery to verify that it is in a 100 per cent fully charged condition. If the open circuit or disconnected voltage reading is below 12.6 V, charge the battery and then recheck the voltage after the battery has set for one to two hours. If the voltage reading is 12.8 V or above, perform the load test described below.
The load test measures battery performance under full current load and is the best indicator of battery condition. Load testing a battery tat is not FULLY CHARGED i.e. at 12.8 VDC can permanently damage it. Fully charge it first and then let it stand for at least an hour before the load test is done. You also need a load tester AND you should know how to perform a load test. Often the best way to load test a battery will be to take it to a battery shop and have it done there.
VOLTAGE and STATE OF CHARGE FOR AGM BATTERIES IS:
12.8 VDC is 100 per cent
12.6 VDC is 75 per cent
12.3 VDC is 50 per cent
12.0 VDC is 25 per cent
11.8 VDC is 0 per cent
COLD CRANKING AMPERAGE (CCA) for a DYNA battery is 270
Battery Charging Rates/Times (Approximate)
FOR A 19 AMP HOUR DYNA AGM BATTERY
BATTERY STATE OF CHARGE is 12.8 VDC is 100 per cent Charge; Rate of Charge is N/A
BATTERY STATE OF CHARGE is 12.6 VDC is 75 per cent Charge; Rate of Charge at 3 AMP is 1.75 hours at 6 AMP is 50 minutes at 10 AMP is 30 minutes at 20 AMP is 15 minutes
BATTERY STATE OF CHARGE is 12.3 VDC is 50 per cent Charge; Rate of Charge at 3 AMP is 3.5 hours at 6 AMP is 1.75 hours at 10 AMP is 1 hour at 20 AMP is 30 minutes
BATTERY STATE OF CHARGE is 12.0 VDC is 25 per cent Charge; Rate of Charge at 3 AMP is 5 hours at 6 AMP is 2.5 hours at 10 AMP is 1.5 hours at 20 AMP is 45 minutes
BATTERY STATE OF CHARGE is 11.8 VDC is 0 per cent Charge; Rate of Charge at 3 AMP is 6 hours, 40 minutes at 6 AMP is 3 hours, 20 minutes at 10 AMP is 2 hours at 20 AMP is 1 hour
The figures listed above assume that the battery is charging at room temperature. If warmer than room temperature, use a slightly shorter charging time. If colder, use a slightly longer charging time.
The use of constant current chargers to charge maintenance free batteries is not recommended. Any overcharge will cause dry out and premature battery failure. If a constant current charger is the only type available, do not exceed the charge times listed above and do not continue charging the battery if it gets hot. When charging, never exceed 15 volts for more than 30 minutes.
If the battery gets hotter than 110 degrees F or 43 degrees C during charging, discontinue charger and allow the battery to cool. Overheating may result in plate distortion, internal shorting, dry out and/or other damage.
first only charge the chair prior to using it, constant charging will dry out the batteries. though not likely the batteries now sounds like a loose connection somewhere, batteries just don't stop they fade out slowly. look for loose connector
DID YOU NOTICE ANY OVER HEAT IN BOTH,THE PC OR CHARGER? IF SO THE CAN BE 2 ISSUES. 1-THE CHARGER 2-THE BAT IF YOU TRY TO CONNECT THE CHARGER WITHOUT THE BATT,THE CHARGER GET HOT? (1) ,DO THE CHARGER IS OK (2)
That is the usual sign that your battery needs replacement. If the battery is over about 18 months old or you either use it a lot and to a low charge state or leave it on the charger most of the time then it has most likely reached its service life.