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 Post subject: Nimh or Lipo for RC Car?
PostPosted: Thu Nov 29, 2018 8:19 pm 
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Joined: Mon Jul 16, 2018 3:06 am
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The biggest difference between NiMH and LiPo batteries is the chemical properties that enable the charging of the batteries. NiMH (Nickel-metal hybrid) uses nickel-based technology and LiPo (Lithium Polymer) batteries use a lithium-ion technology.

What the battery types have in common is that they both store a certain amount of energy depending on their capacity. Batteries can be manufactured with different voltages and capacities by installing battery cells in series or parallel inside the battery pack. One should be careful not to drop the batteries or damage the cases of the battery cells because it can cause a short circuit. Both battery types must be disposed of properly as hazardous waste.

The batteries differ in their properties and uses.

NiMH batteries are easier to use. They must be fully discharged before charging and must be charged fully before storing (Unless Manufacturer tells otherwise. Example. Traxxas). NiMH battery chargers are also very simple. Nimh batteries for Rc Car usually are 7.2v NiMH battery, that is 6 cells, and 8.4v NiMH battery, that is 7 cells.

LiPo batteries don’t have to be fully discharged and they must be stored with a 50−70 % charge level. The charging must be done with a charger with balance charging. It is good to charge and store LiPo batteries in a LiPo safe bag.

Properties and remarks on NiMH batteries:

Easy and worry-free charging and storing "Safe choice for beginners"
Cheaper to manufacture
A common battery type in home appliances and devices
Rated voltage of cells 1.2V
Must be fully discharged before charging
Storing fully charged (Unless Manufacturer tells otherwise. Example. Traxxas)
Batteries are built with standard sized cells with metal cases
“Memory effect”: Batteries must always be fully discharged in order to keep full capacity available

Properties and remarks on LiPo batteries:

Easy to use with the right devices
Manufacturing process is more complicated
Becoming a common battery type in home appliances and devices
Rated voltage of cells 3.0 V when discharging
A charger with balance charging must always be used for charging
Storing with 50−70 % charge level (Voltage per cell 3.85V−3.9V)
A LiPo safe bag must be used when charging and storing
Lighter than NiMH
Can be built in different sizes
“Memory effect”: almost non-existent, batteries don’t have to be fully discharged before recharging
The advantages of lithium batteries compared to NiMH batteries are undeniable.
The weight/power ratio in LiPo batteries is significantly better. LiPo batteries are noticeably lighter and they can store the same amount or more energy relative to their capacity than NiMH batteries. The power output of LiPo batteries is greater in quality and quantity. The power output of LiPo batteries is steady throughout the discharge, whereas the power output of NiMH batteries starts to decrease soon after charging because of higher discharge rate of the battery type.

Therefore with a LiPo battery with the same capacity as a NiMH battery a longer drive time and better performance can be achieved. There are usually are 2s lipo, 3s lipo battery, 4s lipo battery for RC car.


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