They are okay for powering FPV goggles, maybe some low power builds too, but try to get the VTC cells if you can, they have much better performance. I am using Panasonic NCR18650B in this build log only because I have some spare. VTC5A has higher discharge rate (25A) than VTC6 (20A), but slightly less flight time. Sony VTC5A (US18650VTC5A) and VTC6 (US18650VTC6) are the popular choices, with capacity of 2600mAh and 3000mAh respectively. I am using 18650 here because it’s generally more common and widely available online. The numbers are basically the dimension of the cell, 21700 is heavier and physically larger, so is its capacity. Note that there are two main types of Li-Ion cells we use, 1860. Here is the wiring diagram of a 4S Li-Ion battery pack with XT60 and balance connectors. Things You Need To Build Your Own Li-ion Battery If you don’t want to make your own battery packs, you can just buy them off the shelf. They both have the same nominal voltage, but 4S2P will be able to provide double the current, capacity and weight. 4S1P has 4 cells while 4S2P has 8 cells in total. 2P is how many cells are connected in parallel. What’s 4S1P and 4S2P?ĤS is the nominal voltage of the pack, i.e. With a 4S 18650 Li-Ion battery I custom built, i was able to get nearly half an hour of flight time :) It’s pretty incredible! But it doesn’t have the power to perform crazy acro moves, I was only able to cruise around most of the times and do a few flips and rolls here and there. I tested a long range quad that weighs under 250g. It’s also possible to use on highly efficient quadcopters. In fact, Li-Ion battery has been popular in RC fixed wings / planes as they normally only use one motor. If you use an efficient power system, Li-Ion cells can totally handle it. If you power an FPV freestyle drone with Li-ion, it will feel very weak and slow.įor long range aircraft however, it’s a great option because they don’t require a lot of current. However, the maximum discharge rate of Li-Ion battery is not great compared to LiPo, that’s why it’s not a popular battery choice for FPV drones. On paper you should get double the flight time! The 4S 18650 3400mAh I built, only weighs 203g, while a 4S 1600mAh LiPo has nearly the same weight. Li-Ion battery has higher capacity than LiPo for the same weight. The Pros and Cons of Flying Li-Ion Battery
Both battery types can be fully charged to 4.2V per cell. Lastly, you can usually discharge a LiPo down to 3.5V per cell safely, however Li-ion can go much lower, e.g. To give you an idea, typically a high quality LiPo have around 30C to 40C of continuous discharge rate, while Li-ion only has 5C ( What’s C rating?) LiPo batteries have much higher discharge rate than Li-ion, meaning you can get much higher current out of them.
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