NB-4L 710mAh 3.7V Digital Camera Battery for Canon Digital 50/40 IXUS 30 IXUS 50

Specifications:

• High quality rechargeable battery
• Never run out of battery power when you're just about to capture the perfect moment
• This Digital Camera Battery is a high capacity and rechargeable li-ion battery with premium cell
• Time to get extra power for your digital camera
• The Best Battery is a must for all digital camera buyers 
• Replacement NB-4L battery
• Type: Lithium ion rechargeable battery
• Capacity: 760mAh
• Output Voltage: 3.7V
• Compatible with: Canon Digital 50/40 Digital IXUS 30 Digital IXUS 40 Digital IXUS 50 Digital IXUS 55 Digital IXUS 60 Digital IXUS 65 Digital IXUS 70 Digital IXUS 75 Digital IXUS 80 IS Digital IXUS 100 IS Digital IXUS 110 IS Digital IXUS 120 IS Digital IXUS WIRELESS Digital IXUS i zoom Digital IXUS i7 zoom Digital IXUS Series  IXY DIGITAL WIRELESS IXY Digital 40 IXY Digital 50 IXY Digital 55 IXY Digital 60 IXY Digital L3 Series  IXY Digital L4 IXY Digital Series  PowerShot SD30 PowerShot SD40 PowerShot SD400 PowerShot SD430 WIRELESS PowerShot SD450 PowerShot SD600 PowerShot SD630 PowerShot SD750 Powershot SD200 Powershot SD300 Powershot SD400 DIGITAL IXUS 80 IS PowerShot SD1100 I

Details:

• The Digital Camera Battery uses high-quality, high-capacity, stable imports of batteries, supplemented by a new generation of protection chip set overcharge, over-discharge capabilities, comprehensive care of the safety of lithium batteries, and greatly extends the service life of lithium batteries

• Ultra high capacity longer lasting Digital Camera Battery. No memory effect, or fully drain your battery before charging

How to Extend Your Lithium Battery Life:

• Battery Memory - When I first got my new cellphone, my friend recommended to fully drain the battery before recharging it. His reasoning was connected to the idea of battery memory. Allowing the battery to fully discharge then recharging to max, supposedly gives you the complete battery capacity. Otherwise, if you simply charged from the half way point to max battery capacity, the battery would treat the half way point as the empty point, thus cutting your battery capacity in half
• Battery Calibration - There are some benefits to fully discharging your lithium battery periodically, for laptops this can be especially important. If you start to notice your battery meter becoming more and more inaccurate, it may be time for some battery calibration. Allow your lithium battery completely drain, then charge until the battery is full again. This will calibrate your battery  giving you more accurate readings
• Consequences of Heat - Another enemy of lithium battery life is heat. If you were to leave your laptop plugged in and running for a year, you should expect the lithium battery capacity to be anywhere between 60% to 80% of it's original max capacity. This is why people that use their laptops as desktop replacements will notice greatly reduced battery life performance after one year of use. This issue can be resolved by removing the battery while using a corded power source
• Battery Storage - If you don't plan on using your lithium battery for prolonged periods of time, then you'll want to reduce the charge level to 40% and place the battery in the fridge (not freezer). Storing the battery at 100% charge level applies unnecessary stress and can cause internal corrosion. On the other hand, if the charge is too low, the battery can become permanently unusable, due to battery self discharge

How to Charge and discharge:

Diagram of the charging of a secondary cell battery

• During charging, the positive active material is oxidized, producing electrons, and the negative material is reduced, consuming electrons. These electrons constitute the current flow in the external circuit. The electrolyte may serve as a simple buffer for ion flow between the electrodes, as in lithium-ion and nickel-cadmium cells, or it may be an active participant in the electrochemical reaction, as in lead-acid cells.
• The energy used to charge rechargeable batteries usually comes from a battery charger using AC mains electricity. Chargers take from a few minutes (rapid chargers) to several hours to charge a battery. Most batteries are capable of being charged far faster than simple battery chargers are capable of; there are chargers that can charge consumer sizes of NiMH batteries in 15 minutes. Fast charges must have multiple ways of detecting full charge (voltage, temperature, etc.) to stop charging before onset of harmful overcharging.
• Rechargeable multi-cell batteries are susceptible to cell damage due to reverse charging if they are fully discharged. Fully integrated battery chargers that optimize the charging current are available.
• Attempting to recharge non-rechargeable batteries with unsuitable equipment may cause battery explosion.
• Flow batteries, used for specialised applications, are recharged by replacing the electrolyte liquid.
• Battery manufacturers' technical notes often refer to VPC; this is volts per cell, and refers to the individual secondary cells that make up the battery. For example, to charge a 12 V battery (containing 6 cells of 2 V each) at 2.3 VPC requires a voltage of 13.8 V across the battery's terminals.
• Non-rechargeable alkaline and zinc-carbon cells output 1.5V when new, but this voltage gradually drops with use. Most NiMH AA and AAA batteries rate their cells at 1.2 V, and can usually be used in equipment designed to use alkaline batteries up to an end-point of 0.9 to 1.2V.

How to Reverse charging:

• Subjecting a discharged cell to a current in the direction which tends to discharge it further, rather than charge it, is called reverse charging; this damages cells. Reverse charging can occur under a number of circumstances, the two most common being:
• When a battery or cell is connected to a charging circuit the wrong way round.
• When a battery made of several cells connected in series is deeply discharged.
• When one cell completely discharges ahead of the rest, the live cells will apply a reverse current to the discharged cell ("cell reversal"). This can happen even to a "weak" cell that is not fully discharged. If the battery drain current is high enough, the weak cell's internal resistance can experience a reverse voltage that is greater than the cell's remaining internal forward voltage. This results in the reversal of the weak cell's polarity while the current is flowing through the cells[3][4]. This can significantly shortens the life of the affected cell and therefore of the battery. The higher the discharge rate of the battery needs to be, the better matched the cells should be, both in kind of cell and state of charge. In some extreme cases, the reversed cell can begin to emit smoke or catch fire.
• In critical applications using Ni-Cad batteries, such as in aircraft, each cell is individually discharged by connecting a load clip across the terminals of each cell, thereby avoiding cell reversal, then charging the cells in series

Lithium-ion battery:

• The technology behind lithium-ion battery has not yet fully reached maturity. However, the batteries are the type of choice in many consumer electronics and have one of the best energy-to-mass ratios and a very slow loss of charge when not in use.

Lithium-ion polymer battery:

• These batteries are light in weight and can be made in any shape desired.

Battery Capacity:

• Look for batteries with a higher milliampere hour (mAh) rating. This refers to the amount of electricity delivered at any given moment. Electronic devices can handle a range of mAh without damaging the device. So as the rechargeable batteries begin to lose power, they do no damage to the device. Batteries with a higher mAh may look exactly like a battery with a lower mAh but typically they cost more.

Battery Chargers:

• Buy the battery charger that suits your needs. In some instances you can purchase the charger and batteries as a package deal, but if you want your battery charger to maintain your rechargeable batteries properly, you may need to pay more for special features.
• Look for a battery charger that recharges a variety of battery sizes. Select a unit that has a reconditioning cycle. This keeps you from overcharging your batteries. Some models do this automatically while others have a switch you must flip to go into reconditioning mode.

Warnings:

• Do use the specialized accesory to recharge
• The input voltage of any appliance must be in the range of the output of the battery, otherwise it can do harm to the applince
• To avoid the decending capacity, the battery must not be put away over 1 year
• Away from high temperature, and kept in cool dry place

Package Included:

• 1 x 710mAh 3.7V Digital Camera Battery for Canon Digital 50/40 Digital IXUS 30 Digital IXUS 40 Digital IXUS 50