If your rechargeable batteries state they are "Pre-Charged" or "Ready to Use" they can be used straight from the pack just like single-use batteries.
However, standard rechargeable batteries do not have this feature so they will need an initial first charge before use. Self-discharge is an occurrence in rechargeable batteries in which internal chemical reactions reduce the stored charge of the battery without any connection between the electrodes i. Self-discharge decreases the shelf-life of batteries and causes them to initially have less than a full charge when actually put to use.
The rate at which self-discharge in a battery occurs is dependent on a range of factors such as the type of battery, state of charge, charging current and ambient temperature. Storing batteries at lower temperatures thus reduces the rate of self-discharge and preserves the initial energy stored in the battery.
Stay-charged reachargeable batteries hold their charge much more effectively when not in use. This occurs when the internal chemical reactions reduce the stored charge of the battery even when the battery is not in use.
For high drain devices such as remote control toys or digital cameras using a flash, a higher capacity standard NiMH rechargeable may be more suitable, as they will have more power over the first few days before the benefits of a stay-charged battery are applied. However for devices such as smoke alarms, torches, or devices that are used a little less frequently but need a charge on demand, then stay-charged batteries may be a better option.
However with advances in rechargeable technology this problem has been virtually eradicated in modern NiMH rechargeable batteries. How do I charge my rechargeable batteries? Rechargeable batteries will generally need a separate, suitable battery charger to recharge them. There are a wide variety of battery chargers available for different battery sizes, from fast, intelligent chargers, to overnight chargers — all with different features and benefits.
There are some exceptions such as in DECT cordless phone, baby monitors or solar lights where the batteries are recharged via the contacts in the device when it is placed in the base charging unit or dock. Please check the instructions to ensure you choose the correct type of rechargeable battery for your device.
Different devices will require different capacity batteries. Other devices which can use a low capacity battery include garden solar lights or remote controls. Devices which require high capacity batteries include remote control cars, digital cameras and some electronic toys. If you find you are replacing batteries frequently, a high capacity battery will provide longer lasting power. If your device requires batteries which hold their charge in between uses and perhaps are not used for a period of time you may wish to choose a rechargeable battery with stay-charge technology which means the batteries retain their charge between uses.
Batteries typically use an electrochemical reaction to give off usable energy. The efficiency of this reaction can be heavily influenced by a few external factors, includin g temperature. Locally in Berkeley, Al Lashers can order and sell these batteries. With the exception of the Nite Rider Digital Pro 6 and Xcell Pro formerly called NiteHawk lighting systems, virtually all bicycle lighting systems on the market supply inexcuseably cheap, often quite destructive to the battery type of chargers.
The problem is that with most supplied chargers, they charge the battery rather slowly require 10 or more hours to provide a full charge then then keep jamming current into the battery after it's full, heating it up and ultimately destroying it.
While not a "smart" charging system, the NiteRider Xcell Pro and Digital Pro 6 systems do have a reasonably safe "set it and forget" charging system, though only when used with their supplied battery. Their system charges the battery at a modest rate for 10 hours, then a timer switches over to a 3 times slower charging rate for maintanance of the battery. Their system is not a "smart charger" in that it does not in any way sense actual battery condition.
It's relatively easy to make a cheap but safe "set it and forget it" charger for SLA batteries. Amazingly, few if any commercial systems provide this, and instead provide an unregulated DC power supply, which has the potential liklihood, actually of destroying the SLA battery if left attached.
To more quickly charge SLA or NiCd batteries full charge in 2 to 4 hours , one needs a "smart charger". Such a charger senses battery condition during charging, pours current into the battery as long as the battery needs it, senses when the battery is full, and then cuts back to a much reduced current flow or pulses of current at intervals to keep the battery filled without harming it.
This kind of a very smart charger is a nice convenience with a SLA battery, but not necessary in that a simple voltage-regulated "trickle" charger will usually do the job fine for cyclists. You have to add your own cable, of course, to attach the charger to your particular system. Tinkerers should note that a proper trickle charger for SLA batteries is a regulated power supply set to 6.
NiCd batteries really benefit from a proper smart charger. Unfortuately, one has to press into service chargers made for other purposes if one wants a smart charger for one's bicycle lighting system. Or make one oneself from scratch. I've done both, successfully. The DW and DW in particular are good choices. Some camcorder and cell phone 6 volt NiCd battery chargers may be suitable as smart chargers for 6 volt NiCd bicycling batteries.
I've built from scratch two smart chargers for my battery systems using a Maxim MAX smart charger controller chip. Both work very well. Some have used the more modern NiCd smart charger controller chip made by Maxim, Benchmarq , and Unitrode. Contact me for details if interested. The term 'memory' has become a catch-all 'buzzword' that is used to describe a raft of application problems, being most often confused with simple voltage depression.
To the well informed, however, 'memory' is a term applied to a specific phenomenon encountered very infrequently in field applications. Hence the birth of a "memory" phenomenon, whereby nickel-cadmium batteries purportedly lose capacity if repeatedly discharged to a specific level of capacity.
Unfortunately, the idea of memory-related loss of capacity has been with us since. Realistically, however, ' memory' cannot exist if any one of the following conditions holds:. GE has not verified true 'memory' in any field application with the single exception of the satellite application noted above. Lack of empirical evidence notwithstanding, 'memory' is still blamed regularly for poor battery performance that is caused by a number of simple, correctable application problems.
Temperature is very constant through each cycle, and there are absolutely no mechanical shocks or vibrations and and and so on. Also to be correct: The memory effect causes a lower voltage from that point than otherwise expected. And because nickel and cadmium are toxic materials, this makes the disposal and recycling processes at the end of service life prohibitively expensive.
This is particularly true in countries with strict environmental policies and regulations, such as the UK. Lithium-Ion Li-Ion batteries have long been used in electronic devices such as laptops and smartphones, while they are now core elements in the growth of electric vehicles. But recently they are becoming an increasingly viable option for uninterruptible power supplies and other energy storage systems, such as harnessing the power from renewable energy technologies like wind or solar, too.
Another benefit of Lithium-Ion UPS batteries is that they are significantly smaller and lighter because of their significantly higher power density. Despite the cost of Li-Ion UPS batteries decreasing over recent years, it is still a far more expensive initial choice than the other options. However, the longer service life does balance out the higher upfront capital costs.
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