7.2 v battery pack for rc cars
Model Number: 7.2v 250ma. For Vehicle Type: 7.2 v battery pack for rc cars. Tool Supplies: Battery. Remote Control Peripherals/Devices: Battery Charging Units. Use: Vehicles & Remote Control Toys
Upgrade Parts/Accessories: Charger. Four-wheel Drive. Attributes: Battery. RC Parts & Accs: Batteries – NiMH. Use: Vehicles & Remote Control Toys
Everything You Need to Know About RC Batteries
Batteries make everything go in RC, even in nitro-powered models — sure, the engine burns fuel, but you aren’t going anywhere without a battery on board to power the receiver and servos. As with so many aspects of our amazing hobby/sport, you can go super-deep into battery tech if it really interests you — but it’s hardly a requirement for making an informed battery choice and understanding the types of batteries we use in radio control. Here’s everything you really need to know
There are two essential types of batteries used to power electric models: Nickel-Metal Hydride (NiMH) and Lithium Polymer (LiPo). The chemistry-class names refer to the essential materials within the battery that react to store and release energy as electricity, 7.2 v battery pack for rc cars new and each has its pros and cons.
If you purchased a ready-to-run (RTR) model with an included battery, chances are it’s a NiMH. Nickel-metal packs are rugged, inexpensive, and don’t require much in the way of special care. However, they’re heavier than a LiPo battery of similar voltage and capacity (we’ll get to those terms), and their voltage decreases steadily as the pack is discharged. Once you start driving, your car goes slower with each passing minute. Not noticeably at first, but steadily.
As we just discussed, NiMH and LiPo packs are often referred to by the number of cells in the pack: for example, “2 cell” or “3 cell.” You may also see or read about LiPo packs with a designation such as 2S, 3S, 4S, etc. In this case, the “S” refers to series, and indicates that the cells within the pack are connected “positive to negative,” like in the illustration below.
Some LiPo packs features cells connected both in series and in parallel, which is designated by a “P.” For example, a “2S2P” LiPo pack would have two pairs of LiPo cells inside. Each pair would be wired in parallel (2P), and the two pairs would be wired together in series (2S). Is your head hurting? Don’t worry about it. Nearly every RC LiPo is wired in series and simply referred to as 2S, 3S, 4S, etc.
LiPo batteries are generally sold as accessories, but there are RTR models that include them. A LiPo battery is lighter than a NiMH of similar voltage and capacity, 7.2 v battery pack for rc cars which helps your model feel more powerful. Also contributing to that “feeling of power” (often called “punch”) is the LiPo’s ability to maintain its voltage longer as the pack is depleted.
Instead of delivering less and less voltage throughout your run, a LiPo will hold a steady voltage for most of your run, then fall off quickly at the end of the charge. The downside is cost (LiPos are more expensive than NiMH, but the gap is narrowing), and care — LiPos require a specific care regimen for longest life and safe use.
The big number on the battery label (3300, 4000, 5000 etc.) indicates its capacity in milliamp hours, which is generally shortened to “mAh.” The greater the number of mAh, the longer your car will run per charge (and conversely, the longer it will take to recharge the pack).
“Bigger number = longer run time” is all you really need to know, but it’s helpful to understand what the mAh rating actually means. If your battery is rated at 5000mAh, that means it can hold a steady 5-amp load for a full hour. We get “5” from “5000” because a milliamp is 1/1000 of an amp. Divide the mAh rating by 1000, and you get amps. 5000 ÷ 1000 = 5. If you have a 6000mAh battery, it can hold a 6 amp load for an hour. Or, if you put it on a 5 amp load, it will run longer than an hour. See? Greater capacity = longer run time.
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