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 | | Subject: Battery Guide-With charge time Calculator Tue Mar 03, 2009 3:11 pm | |
| Another nosebleeder! caution: beware of nosebleeds while READING this article!!!!!  Battery packs are made up of CELLS, there are several different types of cells out there, and this guide will give an overview of those cells, along with what configurations are good for which cells.
Battery Guide
Note: Cell used in airsoft battery packs are 1.2v per cell.
Calculating Charge Time for ANY Battery
Calculating a batteries charge time involves some very simple math, Below is the basic formula followed by an example:
Capacity of battery / output of charger = time in hours
3000mah battery / 1000mah charger output = 3 hours
Note 1000mah = 1 Amp so if your charger lists its output in amps, convert it to milliamps. 2.5 amps = 2500 mAh etc..
If you have a Ni-Cd battery, discharge it before charging it again.
Battery Charging Time
To find the charging time of your battery, simply divide battery MaH by charger MaH. Too many people ask how long to charge their battery, now hopefully that question can be avoided.
Ex 1. How long to charge a 1200 MaH battery with a 300 MaH charger...
1200 / 300 = 4 --- charge the battery for four hours.
Ex 2. How long to charge a 1500 MaH battery with a 600 MaH charger...
1500 / 600 = 2.5 --- charge the battery for 2.5 hours
the type of battery cell does not matter when charging it (but, as said before, NiCd batteries should be discharged)
Next: Ni-MH vs Ni-Cd (Nickel-Metal Hydride vs. Nickel-Cadmium)
Nickel-Metal Hydride cells:
Nickel-Metal Hydride cells tend to have a higher Mah (Milliamp hours-refer to the capacity) than Ni-Cd batteries which make them ideal for any gun you have. They're great for those guns that use mini batteries. I have noticed that my battery packs that have a 25amp discharge rate have a higher ROF than Ni-Cd packs.
Another great advantage is their spiking tendency; the spiking tendency is the tendency for more voltage to come out of the pack. Spiking is what causes your fuse to blow, or even worse, your motor. Ni-MH packs do not have this tendancy, while Ni-CD's do
One thing to look out for here, the Discharge rate, never get something lower than 20 (personally I never go below 25) amps. A lot of cheap cells out there will run 12 amps, while your average Ni-Cd has 14-16 amps. There is one other disadvantage to Ni-Cd batteries, they cannot be charged as many times, however, when it comes to airsoft guns, this is not something to worry about. Also, with a higher discharge rate, your going to need new fuse, which is a mere .30cents or less at a hardware store, Lowes, home depot, or auto parts store.
Also, for some reason, your ROF doesn't start dropping as gradual as it is with a Ni-Cd battery, only the last 15 shots or so will shoot slow before your battery goes dead.
Overall:
Pros:
Higher MaH rating
Less likely to spike
No discharging necessary
Higher discharge rate than average Ni-Cd batteries
Can give a higher ROF due to higher discharge rate.
The cheap cells are cheaper than a Ni-CD pack.
No memory effect
Cons:
Can be more expensive unless you get the cheap cells
Need to watch for a discharge rate of 20amps or higher.
New .30 cent fuses if you get a good pack.
Little warning when your battery is about to die.
Nickel-Cadmium Cells:
These cells are the norm for AEG’s. These are the battery packs that Tokyo Marui standardizes their AEG’s for. Most sites give you one of these packs for the new gun that you order. These cells are tried and true, been used for a very long time.
These have a higher discharge rate than crappy Ni-MH cells, and you never have to worry about your gun not being able to be powered with one of these packs. If properly shimmed, unless your running an EXTREMLY stiff spring, an 8.4v pack will run it, though at a lower ROF than if you were to upgrade your battery.
Also, with these batteries, your guns ROF will start dropping as your battery goes dead, so you'll know when to get ready for a battery change, or conserve your shots.
Pros:
Cheap
Easy to find
Never have to worry about the amperage.
Warning when it is going dead.
Cons:
They spike.
Less Milliamp hours.
Memory effect.
Have to be Discharged.Thank's for viewin!!!!!!ayuyahhhhhhhhhhhhhhhhh!!!!!!!!!! | |
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