Using Appropriate Loading Methods For Your Battery
A battery should not become warm during charging because high temperatures shorten their life
. However a certain temperature rise can not be avoided especially when charging batteries nickel. The temperature reached a peak when the battery reaches full charge, then reduced slightly when the battery goes into charge mode at low speeds. The battery should eventually return to room temperature.
Chargers nickel is grouped into three categories:
Slow charger - The slow charger, also known as the 'overnight charger', applies a fixed charge of about 0.1 C * (one tenth of the nominal capacity) until the battery is connected. The charging time is 14 to 16 hours. The slow chargers come with cordless phones, CD players and portable consumer products.
Quick Charger - This charger offers several advantages, the most obvious one is load duration smaller. At 1C, a flat NiCd or NiMH usually loads in less than an hour. Accurate detection of full charge is important. Once the battery is fully charged, the charger switches to regime filler then trickle. The rapid chargers are used with industrial equipment such as transmitters - receivers, medical equipment and portable tools.
The nickel-and lithium batteries require different charge algorithms. These two coupless chemicals are not normally interchangeable on the same charger.
A charger that utilizes pulse charging sends pulses to the battery, which can be controlled precisely by changing the length of each pulse. A short rest between each pulse allows the battery to reach stability, making pulse charging much easier on batteries than many other forms of charging. Pulse charging is also thought to help prevent undesirable chemical reactions.
For those who have never attempted to charge a battery before, doing so can be confusing. A variety of methods and techniques can be used to charge a battery, some of which work better in one situation than another. Learning when to use each charging method can help you to get the most out of your battery's life.
A charger that makes use of constant voltage is a DC power supply and is usually present in inexpensive car battery chargers. Lithium ion and lead-acid cell systems utilize constant voltage. Constant voltage is one of the simplest forms of battery charging.
A charger that utilizes constant current makes use of varied voltage, which, when applied to a battery, can serve to create a constant flow of voltage. When the voltage reaches its peak, the charger switches off. Constant current is usually reserved for batteries made of nickel-cadmium or other nickel-metal hybrids.
Taper current charges a battery with an unregulated source of voltage. As cell voltage builds up, the current begins to lessen. Since overcharging a battery can cause damage, taper current is not a recommended method of charging. In general, taper current is reserved solely for SLA batteries.
One of the best ways to recharge batteries is to do so only until the battery is fully charged. Most battery chargers will have indicator lights that let you know the batteries are ready. Cell phones will often display a "battery charging complete" message to let you know the batteries are fully charged. Remove the batteries from the charger instead of leaving them on for an extended period of time after charging is complete. Overcharging batteries will decrease their life. Plan ahead for an optimum time to charge batteries, and set a timer to remind you to take them off the charger. For example, do not put rechargeable batteries on a charger and then go to bed. The length of time you sleep will probably be much longer than the batteries need for charging.
by: judylive
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