LiPo’s, or more appropriately Lithium Polymer, batteries will be the most commonly encountered way these days of powering electrical RC products. Planes and helicopters are largest beneficiaries of the growth of LiPo batteries simply because these are pretty gentle in weight as compared to the amount of energy they are able to keep. In addition they have substantial discharge charges when compared with conventional rechargeable batteries (NiCad or NiMH) enabling them to provide the large bursts of energy demanded by higher efficiency motors employed in intense flight manoeuvres. It really is the innovation on the LiPo rechargeable battery which includes enabled electric power to be so well known for RC helicopters, Lithium polymer battery introduced the expense down and opened the miracles of flying RC helis into a much wider audience who would never ever otherwise have entered the hobby.
For all their rewards you will find several downsides to LiPo’s; specifically their rather higher price tag, whilst possessing a lifespan which is really restricted. You need to care for them properly in the event you are likely to get even 300 – 400 cycles away from them. In order to try this you need a little expertise regarding how to care for them (see post from the very same writer; ‘How To Treatment for LiPo Batteries’ – see backlink at bottom of your site). There exists a diploma of hazard involved with LiPo’s, the risky electrolytes have already been acknowledged to catch fire. This isn’t something which I might overplay but it surely is a thing that you ought to be aware of and may always be kept in your mind.
There are actually a handful of quantities on LiPo batteries which you need to specially seem out for, which establish its rating and suitability for your personal specific product. The most crucial kinds are the batteries voltage (V), its capacity (mAh) and its discharge charge or ‘C’ rating.
So, to your to start with of such – voltage. LiPo battery packs are created up of cells just about every with a voltage of three.7v. These utilized in radio controlled helicopters, planes and the likes will commonly be 1 to 6 cells each and every of three.7v. LiPo’s will generally state the number of cells (S) but do not usually present the voltage. So a 1S pack are going to be three.7v, a 2S pack is seven.4v in addition to a 3S pack eleven.1v, right the best way as many as a 6S pack at 22.2v. Why is ‘S’ used to depict the number of Cells? Perfectly it truly is the volume of cells in Sequence and ‘C’ is accustomed to symbolize the discharge fee. Alright, ‘C’ for Discharge charge! Would make perception! Effectively really there is sense in it since the discharge rate is actually a variable of your Ability of the mobile. This may all turn into clearer later. If there are numerous cells in Parallel this tends to be supplied a ‘P’ variety, but other than quite massive capability LiPo’s packs are often 1P. So you might see “4S 2P” published with a LiPo, indicating that there are two lots of three cells in series hooked up in parallel.
The essential issue nevertheless with voltage is solely making sure that you may have the proper voltage LiPo’s for your personal distinct design. This could be determined by the motor and velocity controller mixture of the product. You just adhere to that. So if it states you would like an eleven.1v 3S LiPo you receive just that on your product. The ability and discharge level of your LiPo’s might be effortlessly different even so the voltage will have to be suitable.
That then potential customers properly on to manage LiPo potential. This is certainly normally offered in mAh (milliamp hours). This quantifies how many milliamps you might drain from it in a regular fee for an hour in an effort to thoroughly discharge the pack. Therefore in case you could run a LiPo at 2200mA for an hour its ability would be 2200mAh and it would have twice the ability of a LiPo that would run at only 1000mA for an hour or so so that you can completely drain it from totally billed. It really is much like the measurement with the fuel tank in your car or truck. Of course the larger sized the potential of your gasoline tank, or LiPo battery, the lengthier you’ll be able to run for. With radio controlled designs, specifically RC helicopters and planes, the limiting factor could be the body weight and size with the battery pack. A bigger ability pack might provide you with for a longer period flight instances but staying heavier it is going to adversely influence overall performance.
So now with the discharge level (C). As famous just before the ‘C’ is related to your ability and in this article is how. The C amount represents what number of periods more quickly in comparison to the Potential you are able to discharge the pack properly in a continual charge. So a 2200mAh LiPo which has a 20C score is often securely discharged at nearly a sustained load of 44000milliamps (44amps). From this you may also figure out how long it might get to totally discharge the pack at that load. Since the capacity of a pack is quantified by how many milliamps it will eventually consider to fully discharge it in an hour, time it will get to empty with the C price are going to be one hour, or 60 minutes, divided because of the C value. So a 2200mAh pack having a 20C ranking would discharge in 3 minutes. In exercise we hardly ever continuously use something like these levels of sustained discharge hence the flight situations a much longer.
Quite a few packs will now exhibit two figures to the capacity, eg 20C/40C. The initial of these represents the constant discharge fee mentioned earlier mentioned along with the next the ‘burst rate’. While you could possibly guess from your identify the burst level denotes the discharge charges for short bursts.