Dont want to overcharge my charger how long do i charge

With that being said, be advised that leaving the screwdriver on the charger after fully charged may overcharge it and also shorten its battery life. Therefore, it is recommended to unplug the unit from the charger after charging.

Yes you can overcharge a battery, it all depends on the charger your using. Most chargers are single stage chargers. Most scooters come with a single stage charger. My scooter has a built in single stage charger What this type of charger does is output a constant 24v @ 4amps.The problem is batteries amperage requirements decrease as the battery charges. An overcharge will occur when the battery is charged. It requires very little amperage to maintain a charge on a fully charged battery. A single stage charger like mine will output 4amps regardless of the state of charge of the battery. Batteries bring charged with single stage chargers loose their electrolyte. What happens is overcharged batteries break down the electrolyte into oxygen and hydrogen. So overcharging will cause a battery to "boil-out" its electrolyte. Batteries don't work without electrolyte. In the old days there were only single stage chargers. That was the state of the art back then. So to cope with the constant overcharging batteries had refill ports where you could replenish the electrolyte using distilled water.

Scooter batteries are far and away different from the lead acid of the 1970's. Scooter batteries are sealed, they are deep cycle, they use a glass mat soaked in gelled electrolyte. These glass mat batteries optimize the electrolyte used so they can use allot less of it. These newer batteries have a lot more power in a lot smaller package but they have a draw back, they must be charged properly. You can absolutely can not charge these batteries with a single stage charger. Actually you can charge with this device but you will loosed electrolyte each time you charge.

I use a three stage charger 24v @ 5amp. This charger s different from a single stage. Its what they term a "smart charger" it monitors the state of charge of the battery. As the battery charges it turns down the amperage. When the battery is fully charged the amperage is turned low enough were the charge is maintained. The entire charging process is designed to preserve electrolyte. In short this type charger will not overcharge the battery.

Click here to see the charger i currently use.
http://www.amazon.com/Sealed-Battery-Charger-3-Stage-Fan-Cooled/dp/B0051WHAU0

Hello Howard, There are two different kind of cordless drill chargers. One is a smart charger that will not overcharge your battery. It usually has a stand alone base that the battery plugs into and sometimes may have a red and/or a green light to let you know it is charged. This charger will stop charging when the battery is fully charged after an hour or less. The other one is a dumb charger that can overcharge your battery if left on the charger too long. This charger usually has a square or rectangular transformer that plugs directly into your wall receptacle. This charger may take up to eight hours to fully charge your battery and will continue to charge until you unplug it.

Rechargeable batteries can and do just die without warning.Sometimes the charger does so as well. The charger automatically prevents overcharging though.

Realistically, all you can do at short notice is to try another freshly charged NB-6L battery. if a camera shop has a display model they might allow you to try their battery in your camera, or more likely, your freshly charged battery in their camera.

Over charging could be the result of several things including:

Faulty Voltage Regulator
1. A car's battery will overcharge if the voltage regulator isn't working correctly. A voltage regulator is usually part of the alternator, and is used to keep a steady flow of voltage to the battery. If the voltage regulator is defective, it will send either too little or too much charge to the battery. If it sends too much, the car battery will overcharge. The voltage regulator is easily replaceable at an easily affordable price, sometimes for as little as twenty dollars, as of 2009.
Faulty Alternator
2. Sometimes the alternator itself can be at fault. The alternator is the device that converts the mechanical power of the engine into electrical power to charge the battery. When an alternator breaks, it usually stops creating electricity for the battery, which will then eventually die. However, if the wrong alternator is placed in the car, or if the alternator is running at the wrong pace, it will create too much energy for the car battery, causing it to overcharge. The alternator is another easily replaced part.
Incorrect Charger Use
3. If a battery charger is used to charge your battery outside of your car, improper use of the charger can result in overcharging. If a battery is placed on the charger too long, it can result in overcharging, and a significant decrease in your battery's lifespan and efficiency. This is why it is important to read about your specific battery and understand how long it needs to charge to be effective. Too much charge will lead to problems.
Faulty Battery Chargers
4. Sometimes chargers can be faulty. Their settings may be wired incorrectly, or the charges labeled incorrectly. As a result, your battery may be getting overcharged, even if you are carefully monitoring your charging. This is a problem that is hard to avoid, as manufacturing mistakes can happen anywhere, anytime without warning. It is a good idea to test your charger regularly to see if it is running correctly.
Heat
5. Extreme heat in the summer can also have an adverse effect on the car battery. If the battery has been previously overcharged, extreme heat can increase the problems caused by overcharging, and exacerbate any other problems with the battery. This problem can be hard to avoid if you live in a warm climate. The only real way to ensure safety against this problem is to avoid overcharge in the first place.

are you sure the battery is fully charged the light on the charger
should shine brightly but you might of overcharged it if you have had it on for 90 mins

The battery has been overcharged and is going to burst if you continue to charge it, Replace the battery again and the charger as well or only charge the new battery when it is low on charge

Margie,   Yes you may charge it overnight. If you use it everyday,charge it every night. Once the charger senses 24 volts it stops sending a charge,so they cannot be overcharged.  I suggest when you go to bed put on the charger and unplug it when you get up in the morning.

you should purchase a mobile v3 car charger for the phone and do not use the other one you have

Yes. But a proper charger will not do that.