Advent 7240 AC Adapter

 ADVENT 7240 Adapter
90 W, 1.75 mm, 4.75 mm


CANON NB-4L Battery Charger

Battery Charger suitable for CANON NB-4L
80.25x49.30x46.33 mm, AC 100-240, DC 4.2V/8.4V


Home > Cordless Drill Battery, Laptop Battery, Laptop Adapter, F.A.Q.

Battery Usage Tips
  1. New battery pack must be fully charged before use.
  2. New battery pack needs to be fully charged and discharged (cycled) a few times before it can condition to full capacity.
  3. Rechargeable batteries undergo self-discharging when they were left unused. Always store a battery pack in a fully charged stage for storage.
  4. Fully drain and fully recharge your battery pack every few months.
  5. Turn down the LCD brightness of your portable device.
  6. Use built-in power management on your portable device.
  7. Turn off LCD or other unnecessary accessories when not in use.
  8. Set screen saver blank to 1 to 2 minutes of your notebook
    Add more RAM if you have an extra RAM expansion slot, it will reduce the usage of hard drive and it is powerful exhaustive.
  9. Close unused software in your notebook.
  10. Remove unused PC cards or USB devices from your notebook.
  11. Don't watch DVD or play graphics intensive video games.
  12. Don't short circuit terminal or store your battery pack with metal parts.
  13. Don't drop or mutilate the battery pack.
  14. Don't expose to moisture or water.

It is normal to get warm when charging or normally using. If it is getting too hot, there may be a problem with the device and qualified personnel should check it.

Frequently Asked Questions--Battery FAQ
Some Battery Terms, see the Battery Glossary
  1. What is a battery?
  2. How do I identify my battery?
  3. What is the difference between Ni-Cd, Ni-MH, and Li-ion?
  4. How long will the new main battery power the laptop?
  5. How to maximize battery performance?
  6. How long does battery last?
  7. How can batteries be connected?
  8. The rating of battery.
  9. How do I charge my batteries?
  10. What is "Memory Effect"?
  11. What is a battery cycle?
  12. Does it really help to store batteries in the refrigerator?
  13. Can I use my old Ni-Cd battery charger to charge my Ni-MH batteries?
  14. Where can I find more information on charging batteries for my notebook computer, digital camera, camcorder or others?
  15. How to prolong lithium-based batteries?
  16. How to Reasonablely Charger your Camcorder Battery Packs.
  17. What does it mean with chip and with no chip?
  1. What is a battery?

    Battery can be any device that stores energy for later use. The word battery is limited to an electrochemical device that converts chemical energy into electricity, by use of a galvanic cell. A galvanic cell is a fairly simple device consisting of two electrodes (an anode and a cathode) and an electrolyte solution. Batteries consist of one or more galvanic cells. A battery is an electrical storage device. Batteries do not make electricity, they store it. As chemicals in the battery change, electrical energy is stored or released. In rechargeable batteries. This process can be repeated many times.

  2. How do I identify my battery?

    The first information to provide would be the make and model of the equipment that you require the battery for .e.g. Toshiba Satellite Pro 400, or Compaq Presario 1283. There is also usually a label on the battery, and some of this information on the label will help our sales team to identify your battery quickly.

    This information includes the voltage of the battery pack (note: this is not the same as the voltage on the power supply), the capacity of the battery pack and the chemical construction of the battery pack e.g. Li-ion, Ni-MH or Ni-Cd. This information can be used to ensure the information you have provided matches the information we have about your battery. Many battery packs also have part numbers on the label; this can sometimes be used to help identify the battery. We would suggest that it is best to have whole this information written down or close to hand before you call our sales team. This will help us deal with your call in an efficient manner.

  3. What is the difference between Ni-Cd, Ni-MH and Li-ion?

    Li-ion (Lithium Ion). This is one of the newest cell types available. It is also the lightest battery type currently available on a commercial basis and can provide more power than the other main cell types. There are no known problems of memory effect with this battery type and it is the easiest battery type to care for. The downside of this battery is that it has the highest engineering costs and therefore the price is usually considerably higher than other cell types.

    Ni-MH (Nickel Metal Hydride). This cell type is the most common cell type currently available for laptop computers, (although Li-ion is rapidly becoming the most popular) this battery type is relatively cheap to manufacture and therefore tends to be cheaper than Li-ion. This cell type is prone to memory effect! so it is important to take good care of your Ni-MH battery to ensure that you obtain the best runtimes.

    Ni-Cd (Nickel Cadmium). This is one of the oldest cell types and is generally only found in older laptops. The main pro for this cell type is its ability to handle higher loads, and therefore is more commonly found in portable power tools or devices that need a lot of power to work efficiently. The main downside of this cell type is that it is notorious for suffering with memory effect so good care must be taken with this battery to ensure most effective use of battery.

  4. How long will the new main battery power the laptop?

    Battery run-time of a laptop is difficult to determine. Actual battery running time depends upon the power demands made by the equipment. The use of the screen, the hard drive and other accessories results in an additional drain upon the battery, effectively reducing its running time. The total run-time of the battery is also dependent upon the design of the equipment. Generally, a new Hi-Capacity battery will run 30% to 50% longer than the old battery did when it was new.

  5. How to maximize your battery performance?

    It is recommended to condition (fully charge and discharge) the new battery few times to allow it to reach its maximum rated capacity.

    Condition the Ni-MH and Ni-Cd battery at least once a month. It will reduce the memory effect.

    Use the battery at least once a month even it was kept in a dry and cool storage.

    Clean the metal connector (the contact to the notebook, usually in color of gold or silver) by alcohol or Electronics Cleaner Degreaser. It will maintain the good conductivity, which improves the power conduction from battery to Notebook.

    Fully optimize the Power Management features provided in system BIOS and Operating System will also improve the battery performance. Consult the user's manual to fully understand the usage of these features.

  6. How long does battery last?

    The life span of a notebook battery is about 1.5 to 3 years operating under normal conditions. As rechargeable battery begins to die, the user will notice a decline in the running time of the battery.

  7. How can batteries be connected?

    Note: When interconnecting batteries (cells), they must be identical in voltage and amp rating!

    1. Batteries may be connected in series. The positive terminal of the first battery is connected to the negative terminal of the second battery; the positive terminal of the second is connected to the negative of the third, and so on. The voltage of the assembled battery is the sum of the individual batteries. The batteries are connected: + to - to + to - to + to -, etc. The capacity of the battery is unchanged.
    2. Batteries may also be connected in parallel. The positive terminal of the first battery is connected to the positive terminal of the second battery, the positive terminal of the second is connected to the positive of the third; the negative terminal of the first battery is connected to the negative terminal of the second battery, the negative terminal of the second is connected to the negative of the third and so on. The batteries are connected: + to + to + and - to - to -. In this configuration, the capacity is the sum of the individual batteries and voltage is unchanged.

    For example, (5) 6V 10AH batteries connected in series produces a battery array that is 30 Volts and 10AH. Connecting the batteries in parallel produces a battery array that is 6 Volts and 50AH. Ordinary auto batteries are designed in the same fashion. Six 2-volt cells are arranged in series to produce a 12v battery. Many Ni-Cd batteries are arranged in the same way.

  8. The rating for battery.

    V (volts): The voltage of the new battery should always match the voltage of the original. mAh: It standards for milli-Amp hours (1 mAh=0.001Ah), High amp-hour ratings means a longer run-time and will not cause incompatibilities.

  9. How do I charge my batteries?

    Our Ni-MH chargers are fully automatic. Plug your charger into an A/C power source and place your batteries into the charger in matched pairs of two or four batteries to begin charging. Red lights indicate charging in progress. The lights will turn green when charging is complete and the charger will automatically switch to a trickle charge. The trickle charge will keep your batteries fully charged and ready for use. Refer to our Charger Manuals page for more detailed operating instructions for your model charger.

  10. What is "Memory Effect"?

    Ni-Cd batteries, and to a lesser extent Ni-MH batteries, suffer from what's called the "memory effect". What this means is that if a battery is repeatedly only partially discharged before recharging, the battery "forgets" that it has the capacity to further discharge all the way down. To illustrate: If you, on a regular basis, fully charge your battery and then use only 50% of its capacity before the next recharge, eventually the battery will become unaware of its extra 50% capacity which has remained unused. The battery will remain functional, but only at 50% of its original capacity. The way to avoid the dreaded "memory effect" is to fully cycle (fully charge and then fully discharge) the battery at least once every two to three weeks. Batteries can be discharged by unplugging the device's AC adapter and letting the device run on the battery until it ceases to function. This will ensure your battery remains healthy.

  11. What is a battery cycle?

    Cycle life is measured by the amount of times a battery may be charged and discharged. Every time a battery is charged and discharged, it uses one cycle. Cycle life is very important in battery applications such as laptop batteries and emergency light batteries. A Ni-Cd battery has a cycle life of 500-1000 or more cycles.

  12. Does it really help to store batteries in the refrigerator?

    Yes, but only if they can be kept dry as well. The higher the temperature, the more the free flow of ions or self-discharge from the battery. Storing primary batteries (D's, C's, AA's, AAA's, 9 volt, etc.) in a cooler environment slows down this rate of discharge that all batteries experience even when not in use, hence a longer shelf life. However, if this is done, it is important that the batteries be kept as dry as possible by keeping them in an airtight container in the driest part of the refrigerator, the door side for example. Long-term exposure to moisture inside the refrigerator can cause internal corrosion to the battery. When removing batteries from the refrigerator, allow them to warm up to room temperature before using them in your device.

  13. Can I use my old Ni-Cd battery charger to charge my Ni-MH batteries?

    No, you can use a new Ni-MH charger to charge your old Ni-Cd batteries but you should not try to charge Ni-MH batteries with a Ni-Cd charger. Here's why: Ni-MH and Ni-Cd batteries are chemically very similar and when both are fully charged, the battery voltage will start to drop. The Ni-MH voltage drop is much more subtle and more difficult to detect. Ni-MH chargers usually have an over temperature sensor and shutoff to prevent overcharge as well as a more sensitive voltage drop detector where Ni-Cd chargers usually only use the voltage drop to determine when to stop charging. If you charge Ni-MH batteries in a Ni-Cd charger, it will probably miss the voltage drop and keep right on charging causing the batteries to overheat. Overcharging and overheating Ni-MH batteries can damage them internally and reduce battery life.

  14. Camcorder Battery Usage Tips

    1) A new camcorder battery comes in a discharged condition and must be charged before use (refer to the devices manual for charging instructions). Upon initial use (or after a prolonged storage period) the digital camcorder battery may require three to four charge/discharge cycles before achieving maximum capacity.
    When charging the camcorder battery for the first time the device may indicate that charging is complete after just 10 or 15 minutes. This is a normal phenomenon with rechargeable batteries. Remove the digital camcorder battery from the device, reinsert it and repeat the charging procedure.

    2) It is important to condition (fully discharge and then fully charge) the camcorder battery every two to three weeks. Failure to do so may significantly shorten the battery's life (this does not apply to Li-Ion batteries, which do not require conditioning). To discharge, simply run the device under the digital camcorder battery's power until it shuts down or until you get a low battery warning. Then recharge the battery as instructed in the user's manual.

    3) If the camcorder battery will not be in use for a month or longer, it is recommended that digital camcorder battery be removed from the device and stored in a cool, dry, clean place.

    4) The milliamp-hour (mAh) rating of the Hi-CapacityT camcorder battery will often be higher than the one on the original battery. A higher mAh rating is indicative of a longer lasting (higher capacity) battery and will not cause any incompatibilities. A Hi-CapacityT digital camcorder battery will, in most cases, outperform the original by 30% to 50%.

    4) The milliamp-hour (mAh) rating of the Hi-CapacityT camcorder battery will often be higher than the one on the original battery. A higher mAh rating is indicative of a longer lasting (higher capacity) battery and will not cause any incompatibilities. A Hi-CapacityT digital camcorder battery will, in most cases, outperform the original by 30% to 50%.

    6) Don't short circuit terminal or store your digital camcorder with metal parts. Don't connect and disconnect the camcorder within a short interval to prevent irregular charging of the rechargeable battery.

    7) It's okay to use different brands of digital camera batteries in the same device -- for example, Energizer, Duracell, and generic. Voltage is voltage, and the device neither knows nor cares that made the camera batteries you put in it. Remember, you can mix brands but not types

    8) Camera Batteries self-discharge quicker when it's hot. They're fine at room temperature, but once it's over 90o or so, they'll start losing their charge faster. So don't leave digital camcorder in a hot car.

    9) Don't overheat. Do not attempt to charge non-rechargeable batteries. This will overheat them and could cause a fire. Keep camcorder batteries out of hot places, like your car. Your car can be an oven, and baking your digital camcorder batteries shortens their life

  15. Where can I find more information on charging batteries for my Notebook Computer, Digital Camera, Camcorder or others?

    Try these links for a more detailed batteries selection for laptop, Digital Camera, Camcorder and battery chargers.
    For a cheap notebook battery Try Cheap Laptop Battery, Laptop Adapter Shop
    Buy cheap Camcorder battery Try cheap camcorder battery, UK suppliers
    For the best digital camera battery Try best digital camera battery online shop
    For the most modes of batteries Try UK Cordless Drill, laptop, Camcorder, Camera Battery Suppliers
    For high quality of power tools battery Try Hi-quality of Cordless drill power tool battery

  16. How to prolong lithium-based batteries

    Simple Guidelines
    1. Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.) Short battery life in a laptop is mainly cause by heat rather than charge / discharge patterns.
    2. Batteries with fuel gauge (laptops) should be calibrated by applying a deliberate full discharge once every 30 charges. Running the pack down in the equipment does this. If ignored, the fuel gauge will become increasingly less accurate and in some cases cut off the device prematurely.
    3. Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage, keep the battery at a 40% charge level.
    4. Consider removing the battery from a laptop when running on fixed power. (Some laptop manufacturers are concerned about dust and moisture accumulating inside the battery casing.)
    5. Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing dates. Do not buy old stock, even if sold at clearance prices.
    6. If you have a spare lithium-ion battery, use one to the fullest and keep the other cool by placing it in the refrigerator. Do not freeze the battery. For best results, store the battery at 40% state-of-charge.
  17. What does it mean with chip and with no chip?

    The chip is a sensor that helps the printer to recognize the cartridge and the ink level.

    For NO-CHIP ink cartridges, customers have to replace the chips from the OEM original ink cartridges (genuine) ink cartridges to our new replacement ink cartridges, and we have instruction inside of the box, you can follow the instruction to replace the chip.

    For WITH-CHIP ink cartridges, you can install them as easy as install the OEM ones.

    Personally, we would recommend you purchasing those ink cartridges with chips, since they will save you from unnecessary efforts and potential trouble.
  18. How to Reasonablely Charger your Camcorder Battery Packs.
    Q: I wanted to know, can Lithium Ion batterys such be overcharged?

    A: Normally Lithium Ion batteries will not be overcharged if you use the correct charger and follow the manufacturers recommendation.
    Most systems have monitoring circuits to prevent overcharging and overheating. The Sony "InfoLithium" batteries and some of the Canon batteries have the circuitry necessary to monitor the battery as part of the battery.
    It it not normally NOT a good idea to discharge Lithium Ion batteries. Just charge them as the manufacturer recommends.

    Q: I understand that I can leave it on the charger, but what about partially charging it?Like if I were to charge a battery that still has power in it ex. 5 hour battery capacity, only 2 hours used, will the battery or camera know when to shut off charging to prevent possible overcharging?

    A: Yes, the battery/charger will know when to stop the charging. The Power/Charge lamp will blink when charging starts and when it has has completed the charge the Power/Charge lamp will go out. The charging time will depend on the current state of charge.

    Q: How is this harmfull? In the past it was always ideal to fully discharge a battery before recharging, so I assumed with Lithium Ion you have the option to charge without fully discharging but I din't think that was preferable.

    A: It has never been ideal "to fully discharge a battery" before recharging. If you are thinking of Ni-Cads, that is not true. The discharged state of a Ni-Cad is normally about 1.0 volts per cell. At that voltage level, most of the energy is spent. Discharging the battery further could damage it through cell reversal. That is why Ni-Cad cells are always connect in series and not in parallel.
    The same basically applies to Li-ion, Li-polymer, NiMH and Sealed Lead Acid batteries except that the minimum cell voltages may be different.
    If your equipment properly monitors cell voltage and possibly cell temperature and disconnects at the appropriate level like many Li-ion, Li-polymer do, then there is no problem. They may say the battery pack is fully discharged, but it still contains energy and that energy can be easily measured.
    Normally there is no benefit to discharge a Li-ion battery unless you are testing it to determine actually capacity, to predict death date when comparing to previous tests of the cell, or possibly discharging to approximately 50% capacity for long term storage. I don't think the average consumer wants to buy the appropriate test equipment and maintain battery performance logs on their batteries.
    Thus my recommendation, buy one spare battery, charge as outlined in your manual, and go have fun with your batteries.

Battery Glossary
  1. Battery: Two or more cells connected together.
  2. Cell: An electrochemical system that converts chemical energy into electrical energy.
  3. Capacity: This is amount of energy a battery cell or battery pack actually provides. The higher the capacity the longer the equipment will run on battery power. Usually measured in Amp hours (Ah) or Milliamp hours (mAh).
  4. Battery Charge: This is the process of passing electricity into the battery pack so the pack can be used to provide power when the user is away from mains power
  5. Li-ion: Lithium Ion. This is one the newest battery types available. It can offer the same power as a Ni-MH battery in a smaller and lighter package. This type does not suffer from 'Memory Effect' but it is expensive to manufacture.
  6. Ni-Cd: Nickel Cadmium. This is one of the oldest battery technologies that are still in use. Usually found only in older equipment or applications that require a high power drain. Very prone to 'Memory Effect'.
  7. Ni-MH: Nickel Metal Hydride. This battery type has virtually replaced the Ni-Cd batteries. This type offers higher capacities, around 30% more than a Ni-Cd cell of the same physical size. This type is also reported to suffer less from 'Memory Effect'.
  8. Battery Float Voltage: A unit for measuring electrical pressure. All batteries provide DC (Direct Current) electricity. It is important to ensure that the equipment you are powering is being provided with the correct volt or else damage may occur.


Any Battery or accessory you purchase from our website is guaranteed:
  1. Full one year warranty (in most items).
  2. All batteries are made with the high quality cells.
  3. A competitive price is our principle.
  4. Replacement batteries which are as good as or often better than the originals.
  5. Shopping with us is 100% secure guaranteed!