There are a few things you need to consider before making a battery purchase. What kind of hobby vehicle you need to power will determine whether you use a Soft battery pack or a Hardcase battery pack. For example, if you’re flying an RC Plane or a Multirotor Drone you would normally use a soft Lipo pack. However, if you’re using an RC Car you would more commonly use a Hardcase battery pack to prevent the battery from being pierced if you crash.
It is also important to know what capacity battery you need (mAh), the cells count (S) and the optimal discharge rate (C rating). Again, this will be determined by the vehicle you are using the battery for. You will also need to consider whether you need a Lipo, LiHV, NiMH etc...
Lithium Polymer batteries are used in many of the RC hobby industries. Over the last few years, Lipo batteries have increased in popularity and are now the most popular battery choice for anyone looking for longer run time and higher power.
LiPo batteries are much lighter in weight and can be made into almost any size or shape. The batteries have a higher capacities that allows them to hold much more power while having a higher discharge rates, meaning they pack more punch. For safe use and storage of Lipo batteries, you need to follow the rules and treat the batteries with the respect they deserve.
LiHV “High Voltage Lithium Polymer” batteries have been around for years. These batteries can be safely charged to 4.35V, which is higher than the typical voltage of Lipos.
As RC hobbyists know, you always want to get more out of your model.Some of the advantages of LiHV batteries are the higher power and longer running times. LiHV batteries can be charged to 4.35v per cell, higher than normal LiPo batteries which sit at 4.20v. For example, a 4S LiHV pack charged at 4.35V would give you 17.4V. A Lipo battery on the same charge would only get 16.8V. LiHV batteries also have a lower internal resistance and are less prone to "puffing".
NiMH batteries are rechargeable and are fantastic for commonly-used or high-drain devices. Many battery applications are compatible with NiMH rechargeable batteries, however they are best-suited for vehicies that require large amounts of energy and are frequently used.