锂电基础知识（翻译）
It can sometimes be difficult to know which battery is best for your application.
For R/C aircraft there is a huge variety of batteries available and while many may suit your application your ultimate goal is to purchase a battery pack that will;
-be within your budget 预算之内
-have a long cycle life 使用寿命长
-have the correct size and weight 大小，重量合适
-give you the longest flight times 以上满足的前提下，最长的飞行时间
-be able to deliver the correct voltage/amp (Power) 输出的电流和电压正确
We hope this simple guide helps you understand the different types of LiPoly (Lithium Polymer) batteries and which is right for your model.
You may have noticed by now that batteries have different ratings, sizes, plugs, wire, charge rates and chemical makeup. Lets decipher;
Capacity (mAh). 容量
This is usually the biggest number shown on the pack and is measured in mAh (Milliamp/hour) or Ah (Amp/hour). The capacity is the first indicator of the batteries size. To keep things simple, think of capacity (mAh) as the amount of fuel in your cars gas tank. A higher capacity tank will run your car for longer. A 4,000mAh battery will run for twice as long as a 2,000mAh battery.
A 2,000mah battery will (in theory) run for 1hr if drained at a constant 2,000 Milliamps.
原则上（没有虚标的话），2000mah的电池以2000milliamps放电的话可以用1小时。
Discharge (C) 放电
Discharge is the amount of power the battery can ‘push’ out and the number shown ’20C’ is an multiplication of the capacity. For example; A 20C battery can discharge at 20 x 2,000mAh which is 40,000mAh or 40Amps.
20C就是20倍电池容量，比如20C的2000mah放电是20*2000 或者40Amps
瞬时放电就是电池瞬时（10－20秒）可以达到的最高电量
This is an important number if you know your motor requires a certain power level.
In addition to this, batteries have a ‘Burst’ rate, which is the amount of power the battery can discharge for a short period, usually 10-20 seconds. A typical battery label may show 20-30C, this would mean a 1,000mAh battery can discharge 20,000mAh constantly or give a sudden and short 10-20 second 30,000mAh (30A) burst of power.
比如：一块1000mah电池写20－30C，可以按照20amps长期放电或者可以按照30amps短时放电。
Tip: A higher ‘C’ rated battery will last longer if run at a lower ‘C’ rate. Example: a 30C battery run at 20C maximum will have a longer cycle life than a 20C run at 20C each flight.
Voltage (S)电压
All lithium Polymer cells in any industry have a nominal voltage of 3.7v per cell. When fully charged a LiPoly cell should be 4.2v and when discharged it should never be below 3v.
You will notice that LiPoly RC packs are made up of layers of multiple cells. If the battery’s rating is 3S this means it is 3 x 3.7v which is 11.1v. It has 3 layers of 3.7v each. In other words, its a ‘3 cell pack’.
Lipo电池的通用标准是3.7v每一个单元，4.2v(满电）或者3V(放完），一个3单元的电池，就是3*3.7v或者11.1v。
Weight/Size
For a battery to be right for your model it must fit within the models battery compartment and also balance the plane correctly.
It’s temping to choose the biggest and most powerful battery your model can handle, but this will sacrafice flight performance and if your packs voltage is too high; destroy the ESC or Motor.
Check with your ESC and Motor specification to ensure you have the right voltage pack then check the models CG (Center of Gravity) to decide on the right battery weight.
电池的电压要与电机匹配而且要考虑平衡等因素
LiPoly Charging
Always use a lithium Polymer battery charger and never charge the battery above 4.2v per cell. (example: 2S, never above 8.4v)
Never leave a charging battery unattended.
Never allow the battery’s voltage to fall below 3.2v per cell. (example: 3S, never below 9.6v)
充电时，不要充过每个单元4.2V或者3个单元12.6v，
放电时，不要低于3每个单元3.2V或者3个单元9.6v.
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