The low self-discharge nickel-metal hydride battery (LSD NiMH) was introduced in November 2005.

This kind of battery reduces self-discharge and, therefore, lengthens shelf life compared to normal NiMH batteries. By using improved separator and improved positive electrode, manufacturers claim the batteries retain 70 to 85% of their capacity after one year when stored at 20 °C (68 °F), while standard NiMH batteries may lose half their charge in this time period. Retention of charge depends a lot on the battery's impedance or internal resistance (the lower the better), the size of the battery as well as the mAh rating. High quality separators are also very important. Thick separators take up space and reduce capacity, while providing a low-tech way of reducing self discharge. Thin separators tend to raise the self discharge rate. Some batteries may have overcome this obstacle with more precise manufacturing techniques and by using a more advanced sulfonated polyolefin separator.

When compared to regular NiMH batteries, low self-discharge types are most useful when there is more than three weeks between charge and discharge to empty on average, or to ensure stored devices are usable several weeks after charging of batteries. Specifications for the self discharge rate are not always clear or widely published, and virtually any LSD may claim to maintain some level of charge after 12 months. A non-low-self discharge battery typically self discharges at a rate of about 20% within the first 24 hours, then from 1% to 4% per day thereafter.

In devices not accurately calibrated to closely predict battery level, run-times for LSD NiMH batteries can be as good or even better than normal cells with higher rated capacity, because the slightly higher operating voltage doesn't trip a device's under-voltage shut off circuit.

Batteries with low internal resistance waste less energy and capacity on heat during rapid discharge and recharge. Low self-discharge NiMH batteries typically have significantly less internal resistance than traditional NiMH batteries.

There are many brand names for LSD NiMH batteries. Most manufacturers produce only size AAA and AA batteries, and most low self discharge batteries are sold in these sizes. C and D cells are available, though some are AAs inside a C/D-sized case. Several manufacturers also offer 9v (PP3) LSD NiMH batteries, rated between 150mAh and 250mAh.

Of all the environmental factors, the temperature on the battery charge-discharge performance of the largest in the electrode / electrolyte interface the electrochemical reaction

With the ambient temperature of the electrode / electrolyte interface is considered the heart of the battery. If the temperature dropped, the electrode response rate also dropped, assuming that

To maintain a constant cell voltage, lower the discharge current, battery power output will fall. If the temperature rises and vice versa, that is, the battery output

Power would be an increase in electrolyte temperature also affects the transmission speed of temperature rise is accelerated, sending the temperature dropped, send down, let the battery charge

Electrical properties will also be affected. However, the temperature is too high, more than 45, will destroy the chemical balance of cells, leading to side effects.

There are 3 main types of batteries; nickel cadminum (NiCD), nickel-metal hydride (NiMH), and lithium polymer (LiPO). NiCD batteries were one of the first batteries to be used in airsoft. They are available in 8.4V, 9.6V, 10.8V, and 12V packages with varying mAh ratings. NiCD batteries are not as common as they  used to be in airsoft due to the fact that they have to be completely discharged before they can be recharged again. This axtra step can be an inconvenience, even for those with smart chargers and dischargers. It is for that reason that NiCD batteries are phased out of airsoft, however you will see some for sale every now and again. NiMH batteries have been replaceing NiCD batteries since they are offered in the same voltage and mAh as NiCD batteries, except NiMH batteries don’t need to be discharged before recharging. NiMH batteries are currently the mosr common type of airsoft battery. Itis a lightweight and very powerful battery pack. LiPO batteries are commonly offered in two voltages, 7.4V and 11.1V. Many of today’s airsofters are swiching to airsoft LiPO batteries because they offer more voltage than NiCD or NiMH batteries but tack up far less room. Higher performance from a lighter and smaller package would seem to make NiMH batteries completely pbsolete. however there are still some that prefer the more stable NiMH batteries to the more volatile LiPO batteries. lituium polymer batteries can be dangerous if mishandled, which is why Mars Battery onle sells LiPO batteries with the proper charger and a LiPO Sack.

Tech Terms

mAh: MilliAmp Hours. A 1 mAh battery could last ~ means 1 hour at one milliAmp load.
Amps: Amperes, Current
Volts: Volt. 
Ohms: Resistance  Each of the bulbs has a resistance of (20-300) ohms.
NiCd: Nickel Cadmium.  A rechargeable battery chemistry.
NiMH: Nickel Metal-Hydride.  A rechargeable battery chemistry.
LiPoly: Lithium-polymer rechargeable chemistry (it's expensive but weight is light and more powerful)

Rechargeable Batteries

There are 3 principle chemistries of rechargeable batteries recommended for Airsofts: NiCd, NiMH, and LiPoly.

LiPO batteries are recently usage for airsoft more and more commom -- while voltage options remain limited (the most common is 7.4V and 11.1 volt), they are about the right size for airsoft, and if you take care to not heat up the gel-packs, they are an extremely good high-ROF battery for your airsofts. This battery is recommended for upgraded AEGs only.

NiCd batteries are probably the most common type found in airsoft AEGs. They come in two basic cell sizes, 2/3A(mini type)and AA (mini cell size) and sub-C (large cell size) and each cell produces 1.2 volts of power. The capacity of the cells vary from ~500 mAh to ~1800 mAh. By stringing together NiCd cells you determine the final voltage of the battery pack. 7 cells = 8.4 volts, 8 cells = 9.6 volts, 9 cells = 10.8 volts, and 10 cells = 12 volts. However, a battery pack’s capacity is determined by the mAh of one cell. Each cell is discharging it’s mAh at the same time.

Example: An 8.4 volt, 1000 mAh NiCd battery can produce 7000 mAh of constant current for ~one hour through a 8.4 volt electrical “faucet”. 7 cells x 1000 mAh = 7000 mAh total current.

Two more things concerning NiCd batteries: First is the need to discharge the battery before you recharge it. If you don’t, the battery “remember” and resists taking on a full charge next time. (I've read a few commentaries that suggest discharging is not necessary but conventional wisdom says to fully discharge) Secondly, after recharging, the battery will lose about 1% of its charge per day just sitting on the shelf.

NiMH batteries are also, very common in airsoft AEGs. They are a bit more expensive, but they have a higher capacity (up to 3300-4600mAh). NiMH are a bit more difficult to charge than NiCd, so make sure your charger is able to handle them. NiMH batteries also have a higher rate of self-discharge, losing about 2-3% a day. Discharging the NiMH before recharging is not necessary.

 After a long time evaluating

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And we always find so much different between two batteries with the same capacity on their package. One can use for 2 hours,another only 40min.

How to calculate their true capacity(We use K instead)?

Lets Pele,the manager of VB Power, give you the best answer as follows:

your eletrical appliance must have a "amount of power"  with a unit "W(watt)", We use P instead.

and it must have a "voltage" with a unit "V(Volt)",We use U instead.

P/U is the current of your eletrical appliance,We use "I" instead,the unit is "A(amps)".

Then,use the Battery on your eletrical appliance,from full charge to empty.remember the time.We use "T" instead,the unit is "H(hours)"

I*H=K,so,PH/U=K,1A=1000ma,1AH=1000mah,

Then you can get the true capacity of the texting battery.

Cordless Drill Batteries
Every person who has a home workshop knows how important it is to have a good cordless drill, and good cordless drill batteries. For home remodeling, home building and additions, home repair, furniture building and repair, and other woodworking projects, a cordless drill is essential, and using the best batteries for your cordless drill can make a big difference in how well your projects go. Although most home workshop tool collections probably also include a corded drill, cordless drills are necessary for many jobs. It is safer to use a cordless drill when working on a ladder or on a high place such as a roof, and also when you are working in tight spaces or at awkward angles. The only disadvantage of using a cordless drill, however, is that the battery or batteries may run out of juice while you are in the middle of a task, and that can sometimes make things very inconvenient for you. One way to ensure that this type of thing won't happen is to make sure your battery or batteries are fully charged before you use them, and to keep back-up cordless drill batteries nearby that you know are fully charged. Another way to help with the problem is to buy the best batteries possible for your cordless drill or drills; ones that you know will last the longest both when you are working on a task and before they need to be replaced.

Fortunately, today's battery packs for cordless drills are a big improvement over the batteries that used to be used with cordless drills, although there still can be a difference in the performance and life of the batteries that you buy. There also are environmental factors to consider when buying cordless drill batteries. A lot of cordless drills are run using nickel-cadmium batteries, and these batteries are powerful and can be recharged successfully so many times that it may be years before you have to replace them. It is replacing them, however, that can pose a problem. The problem doesn't lie in finding more - there are plenty of nickel- cadmium batteries out there to buy - the problem is disposing of the old batteries. Old nickel-cadmium batteries should never be thrown in the trash, since cadmium is highly toxic and can leach into the ground from landfills, contaminating water sources and posing a significant environmental risk. Nickel-cadmium batteries must be recycled or disposed of properly, but unfortunately many people don't heed this warning. An excellent alternative to nickel-cadmium batteries are nickel-metal-hydride batteries, which have been shown to last as long, or perhaps even longer, than nickel-cadmium batteries, yet they are not toxic to the environment. With this in mind, even if the nickel- metal-hydride batteries cost a bit more, it is better to buy cordless drills that already have this type of battery inside, or that can run on this type of battery. The more consumers buy the cordless drills that run on the more environmentally- friendly batteries, the more manufacturers will produce this type of cordless drill. Hopefully, toxic nickel-cadmium batteries will soon be a thing of the past.

Although different manufacturers will claim that their cordless batteries are better than others, the difference between cordless batteries really is negligible, as long as they are the right batteries for your cordless drill. The size and power of the batteries depends on the size and power of the cordless drill, and how efficiently the batteries work can depend a lot on how well the battery charger works. Don't ignore the battery charger when you are buying cordless batteries - some are better and last longer than others.

More questions please feel free to write to us at sales@vbpowerbattery.com

Battery chargers are our specialty. We specialize mainly in consumer battery chargers for Lithium Ion, NiCD and NiMH batteries.

We offer various battery chargers for AA, AAA , C, D and 9 volt batteries. The most common consumer battery chargers charge both NiMH and NiCD batteries.

Although the battery charger may only say nimh or nicad I believe it would do both, NiMH batteries are higher in capacity so the nicad battery charger would take longer.

I take phone calls all day long and I think one of the most asked question is! How long will it take to charge my batteries with your battery charger?

Wow I ask myself how much money will I have it the bank in 10 years. We need more information like current amount and interest rate.

Let me give you two examples to show you how to determine how long it would take. Lets say you have a battery charger that has an output of 400 mA and your batteries are 2200 mille amp hour.

It would take approximately 2200/400 lets say 5.5 hours give or take a few based on state of charge. Should the batteries be 1/2 charged
then it would take around 2.75 hours.

Second example lets say you have a 9 volt battery which is 200 mille amp hour and the battery charger puts out 50 mille amp hour it would take around 4 hours or so to fully charge. So next time you want to know the answer do the math.

AA Battery chargers come in mainly two types. One would be timer control the other would be a smart charger. What is the difference? Great question I get that every day.

A timer control charger is one you put the batteries in and it starts to charge the batteries for a designated amount of time. Say the charger has a 8 hour timer. The charger will start charging the batteries for 8 hours and stop after that amount of time.

O.k so you ask what is the problem. Lets get back to the example above. The charger is a 300 mille amp hour charger and set to charge for 8 hours but the batteries are 2900 mille amp hour.

After the 8 hours the charger shuts down now assuming the batteries were completely dead or fully discharged the batteries would never meet its full potential.

So you ask why would anyone buy a timer control charger? They are cheaper and the average shopper thinks they just saved money and they actually did but if you plan to buy the highest capacity batteries the make sure you buy a qualified battery charger.

Lower capacity batteries work great with timer control chargers but when you buy 2500 mille amp hour, 2600 mille amp hour, 2700 mille amp hour and 2900 mille amp hour batteries make sure you get a smart battery charger.

A smart battery charger usually charges at a higher rate of charge lets say 500 mille amp hour, 800 mille amp hour or 1000 mille amp hour.

So your batteries are 2900 mille amp hour and the charger is a smart charger that charges at 800 mille amp hour once again we go back and do the math. The charger is 800 mille amp hour and the batteries are 2900 mille amp hour so we take 2900/800 and it should take around 3.5 hours to fully charge your batteries or battery pack. The smart charger will detect the cells are fully charged and then shut down hence smart charger.

I want to touch on solar battery chargers which charge mainly all consumer sizes. The solar battery chargers that we offer are slow rate chargers so here is what I highly suggest.

When you buy a solar battery charger buy the nicad batteries to go with it. They are lower in capacity and will be charged faster.

I could only assume that if you are using a solar battery charger that you are hiking, camping and that you want your batteries charged as fast as possible. Nicad batteries will be charged before nimh batteries will be charged.

Lets sum up this lesson on battery chargers. When making a decision on buying a battery charger first decide on the batteries. Should you choose the newer higher capacity nimh
batteries buy a smart nimh / nicd battery charger.

Don’t be a hero and try to save 8 to 10 dollars on the charge and end up having great batteries that will not properly charge in a slow timer control charger.

I hope that the information in this article has helped make a educated decision on buying your next battery charger.

Should you have any questions please email me sales@vbpowerbattery.com or call me toll free 0086-769-82605822