My lg tablet is on the charger and says its charging but every couple of seconds it stops charging while on the charger. My battery percentage has been at 18% for almost four hours.

Take it back to where you bought it from and have it replaced.

Optimus dying on charger/charging backwards - Android Forums at ...

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Aug 2, 2012 - 11 posts - ‎8 authors
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Why does my battery percent go down when plugged into ...

If you don't have the original charger and cable, it won't ever say, "charging", but any standard USB cord plugged into any standard USB charger will work. It just doesn't say, "charging", and will charge slowly. Check the percentage of battery, and check again in half an hour. You will see that it is indeed charging.

I took mine to a B&N store, and that's what they said. They no longer stock the chargers/cords.

Check the charger and cable if they are not originally coming with the unit itself.

If they are aftermarket, check if they both on their own can support 2A charging current. For the adapter, its rated ampage should be on the label by ampere. For the cable itself, it must be a SAMSUNG tablet compatible one.

Morning Emily,

A couple of questions, then a couple of ideas.

1. Are you using the charger that came with the tablet or are you using a universal charger?
2. Do you leave the tablet on the charger a lot of the time or do you only charge it when it gets very low on charge?

Often devices like these need to be drained periodically so that your battery does not develop a shallow cycle. Shallow cycle can often occur whenever a device is charged often before it actually gets down to a low percentage of this battery capacity. If you have been typically keeping it charged without letting it drain I would suggest leaving it on and letting it drain fully and then try to recharge again.

If you have not been doing constant charges as described above, then it sounds to me like either you have a bad charger or there something wrong with the battery in your device. I'm going to provide a link to a Page on the next book site so that you can see some of the information related to your device.

I think the biggest questions to be asked are, a) is the charger that you're using putting out sufficient power to charge the battery properly, or b) is the battery in your unit defective. These questions can probably be best answered through the store which you purchased it, such as a Best Buy or wherever it is that you got it. They should be able to analyze the output of the charger to see if it's correct. If it is correct and again if you've not been doing the shallow cycling then that would indicate a problem with the battery.
I'm including some links below that might be helpful for you. The first one is to a knowledgebase article dealing with battery and battery life. The subsequent links are for the manual and also for the technical specifications for your device. The tech specs will probably help as far as your battery and also what should be the output of your charger.

Knowledge Base:
http://support.nextbookusa.com/support/index.php?/Knowledgebase/Article/View/71/23/battery

Links:

Manual http://www.nextbookusa.com/pdfs/NEXT8P_Manual.pdf

Spec Sheet http://www.nextbookusa.com/pdfs/NEXT8P_Spec_Sheet.pdf

I hope this helps.

It's possible your charger is faulty. If your unit can charge with a USB cord through a computer try that. If it charges then your charger is faulty. The charger can be tested with a voltmeter by someone knowledgeable. The other problem possible is that the charging receptacle is faulty. That would show up if the USB method doesn't work. If the charger is o.k. then your battery won't hold a charge and needs to be replaced.

i had same problem with my gadget,i replaced the battery.and have it checked to make sure no reformattingg needed

When you plug into it , it should show a small battery with percentage of charge on the screen , is there power at the wall outlet u have charger plug in at ????

With your tablet unplugged, press and hold the Power button for around 30 seconds. Then place your tablet on the charger (preferably the home charger) and wait a couple minutes. Then press and hold the power button for around 30 seconds again. If this does not help, then the battery may be bad. Storing a lithium-ion battery should done with no less than 40% battery life left, otherwise the battery voltage or power can go below the safety net (li-ion batteries are not fully dead when your device tells you they are. Once the battery reaches below the safe level, the battery is no longer good or safe to use anymore).