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What is the "Memory Effect"?
NiCad batteries, and to a lesser extent NiMH 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 insure your battery remains healthy.
Is it Possible to Upgrade the Device's Battery to a Newer Chemistry?
NiCad, NiMH and Li-Ion are all fundamentally different from one another and cannot be substituted unless the device has been pre-configured from the factory to accept more than one type of rechargeable battery technology. The difference between them stems from the fact that each type requires a different charging pattern to be properly recharged. Therefore, the portable device's internal charger must be properly configured to handle a given type of rechargeable battery.
Refer to the owner's manual to find out which rechargeable battery types the particular device supports.
The New Battery Isn't Charging. What's the Deal?
New batteries are shipped in a discharged condition and must be charged before use. We generally recommend an overnight charge (approximately twelve hours). Refer to the user's manual for charging instructions. Rechargeable batteries should be cycled - fully charged and then fully discharged - two to four times initially to allow them to reach their full capacity. (Note: it is normal for a battery to become warm to the touch during charging and discharging).
New batteries are hard for the device to charge; they have never been fully charged and are therefore "unformed". Sometimes the device's charger will stop charging a new battery before it is fully charged. If this happens, remove the battery from the device and then reinsert it. The charge cycle should begin again. This may happen several times during the first battery charge. Don't worry; it's perfectly normal.
How Can I Maximize Battery Performance?
There are several steps you can take to insure that you get maximum performance from the battery:
- Break In New Batteries
- New batteries come in a discharged condition and must be fully charged before use. It is recommended that you fully charge and discharge the new battery two to four times to allow it to reach its maximum rated capacity.
- Prevent the Memory Effect
- Keep the battery healthy by fully charging and then fully discharging it at least once every two to three weeks. Exceptions to The rule are Li-Ion batteries which do not suffer from the memory effect.
- Keep the Batteries Clean
- It's a good idea to clean dirty battery contacts with a cotton swab and alcohol. This helps maintain a good connection between the battery and the portable device.
- Exercise the Battery
- Do not leave the battery dormant for long periods of time. We recommend using the battery at least once every two to three weeks. If a battery has not been used for a long period of time, perform the new battery break in procedure described above.
- Battery Storage
- If you don't plan on using the battery for a month or more, we recommend storing it in a clean, dry, cool place away from heat and metal objects. NiCad, NiMH and Li-Ion batteries will self-discharge during storage; remember to break them in before use. Sealed Lead Acid (SLA) batteries must be kept at full charge during storage. This is usually achieved by using special trickle chargers. If you do not have a trickle charger, do not attempt to store SLA batteries for more than three months.
- For Notebook Users
- To get maximum performance from the battery, fully optimize the notebooks power management features prior to use. Power management is a trade off: better power conservation in exchange for lesser computer performance. The power management system conserves battery power by setting the processor to run at a slower speed, dimming the screen, spinning down the hard drive when it's not in use and causing the machine to go into sleep mode when inactive. The notebook user's guide will provide information relating to specific power management features.
How Are Batteries Rated? What Are Volts and Amps?
There are two ratings on every battery: volts and amp-hours (Ah). The Ah rating may also be given as milliamp-hours (mAh), which are one-thousandth of an amp-hour (for example, a 1Ah battery is 1000mAh). Amp-hours are a rating of the amount of energy that a battery can store. Another way of looking at it is to say that the higher a battery's amp-hour rating is, the longer the battery's run-time will be. Some of our batteries will have higher amp-hour ratings than the original battery found in your device and will not cause any incompatibilities.
On the other hand, while the voltage of the Hi-Capacity battery may not be identical to the original battery, the voltages must be within a reasonable range. In order to rate the voltage of the cell, a voltage value between 3.0 and 4.2 must be picked. The voltage that is picked is called the "nominal" voltage, which means that it is for naming purposes only, whereas the actual voltage of the cell depends on the state of charge. Historically some manufacturers picked 3.6V while others picked 3.7V to name the cell. The functionality and performance of either cell is identical and cannot be differentiated by the device.
The explanation above applies to a single Li-Ion cell in series. When a battery has two or more Li-Ion cells in series, the voltage is multiplied by the number of cells in series, as in the table below:
Number
of Li-Ion cells in series | Nominal voltage | Type of
device | 1 | 3.6V
or 3.7V | Cell phones and Digital cameras | 2 | 7.2V or
7.4V | Digital cameras and camcorders | 3 | 10.8V or
11.1V | Laptops | 4
| 14.4V or 14.8V | Laptops | Thus,
A Li-Ion battery
labeled 3.6V is the same as a Li-Ion battery labeled 3.7V.
A Li-Ion battery labeled 7.2V is the same as a Li-Ion battery
labeled 7.4V.
A Li-Ion battery labeled 10.8V is the same as a Li-Ion battery labeled 11.1V.
A Li-Ion battery labeled 14.4V is the same as a Li-Ion battery labeled 14.8V. |
How Long Do Batteries Last (What is the Life Span of the New Battery)?
The life of a rechargeable battery operating under normal conditions is generally between 500 to 800 charge-discharge cycles. This translates into one and a half to three years of battery life for the average user. As the rechargeable battery begins to die, the user will notice a decline in the running time of the battery. When a battery that originally operated the notebook for two hours is only supplying the user with an hour's worth of use, it's time for a new one.
Should I Recycle the Old Battery? How?
NiCad, NiMH and Li-Ion batteries should be recycled. Be environmentally conscious - do NOT throw these batteries in the trash.
If you don't know where your local recycling facility is, call the Portable Rechargeable Battery Association at 1-800-822-8837. They will provide you with the address of the recycling center nearest to you.
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