Batteries

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Lithium Polymer Lipo Battery packs for model boats
Lithium Polymer Lipo Battery packs for model boats

Li-poly batteries are also gaining favor in the world of radio-controlled aircraft, radio-controlled Boat and large scale model trains, where the advantages of both lower weight and greatly increased run times and power delivery can be sufficient justification for the price. Radio-controlled car batteries are often protected by durable plastic cases to prevent puncture. Specially designed electronic motor speed controls are used to prevent excessive discharge and subsequent battery damage. This is achieved using a low voltage cutoff (LVC) setting that is adjusted to maintain cell voltage greater than (typically) 3 V per cell.

NiMh Batterys For Model Boats
NiMh Batterys For Model Boats

A nickel metal hydride battery, abbreviated NiMH or Ni-MH, is a type of rechargeable battery. It is very similar to the nickel cadmium cell (NiCd). NiMH use positive electrodes of nickel oxyhydroxide (NiOOH), like the NiCd, but the negative electrodes use a hydrogen-absorbing alloy instead of cadmium, being in essence a practical application of nickel hydrogen battery chemistry.
A NiMH battery can have two to three times the capacity of an equivalent size NiCd, and their energy density approaches that of a lithium-ion cell.

Sealed lead acid Gel Batterys
Sealed lead acid Gel Batterys

A gel battery (also known as a "gel cell") is a rechargeable valve regulated lead-acid battery with a gelified electrolyte. Unlike a traditional wet-cell lead-acid battery, these batteries do not need to be kept upright (though they cannot be charged inverted). In addition, gel batteries virtually eliminate the electrolyte evaporation, spillage (and subsequent corrosion issues) common to the wet-cell battery, and boast greater resistance to extreme temperatures, shock, and vibration. As a result, they are primarily used in automobiles, boats, aircraft, and other motorized vehicles. These batteries are often colloquially referred to as sealed lead-acid (SLA) batteries due to their non-leaking containers, but they are not completely sealed; the valve regulation system allows for gas to be expelled. Chemically they are the same as wet (non sealed) batteries except that the antimony in the lead plates is replaced by calcium. This preserves the mechanical characteristics but renders the construction far less prone to gassing. The battery type is often referred to as a Lead-Calcium battery.

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