Jump to navigation Jump to search For portable charger.l senses of this term, see AC adapter. This unit charges the batteries until they reach a specific voltage and then it trickle charges the batteries until it is disconnected.
A to the battery at all times, which will damage the battery if left connected too long. A battery charger, or recharger, is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it. A trickle charger provides a relatively small amount of current, only enough to counteract self-discharge of a battery that is idle for a long time. Lithium ion battery cells use a chemistry system which does not permit indefinite trickle charging. Slow battery chargers may take several hours to complete a charge.
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High-rate chargers may restore most capacity much faster, but high rate chargers can be more than some battery types can tolerate. Such batteries require active monitoring of the battery to protect it from overcharging. Electric vehicles ideally need high-rate chargers. For public access, installation of such chargers and the distribution support for them is an issue in the proposed adoption of electric cars. Charge and discharge rates are often given as C or C-rate, which is a measure of the rate at which a battery is charged or discharged relative to its capacity.
The C-rate is defined as the charge or discharge current divided by the battery’s capacity to store an electrical charge. 10 such batteries in one hour. Since the unit of the C-rate is typically implied, some care is required when using it to avoid confusing it with the battery’s capacity to store a charge, which in the SI has unit coulomb with unit symbol C. As some batteries reach their full charge, cooling may also be observed.
Battery cells which have been built to allow higher C-rates than usual must make provision for increased heating. A simple charger works by supplying a constant DC or pulsed DC power source to a battery being charged. A simple charger typically does not alter its output based on charging time or the charge on the battery. This simplicity means that a simple charger is inexpensive, but there are tradeoffs.