Questions tagged [batteries]

For questions about the batteries of your drone. Please consider using a more specific tag as well, e.g. [lipo].

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Motor voltage, kv, and battery weight saving

I would like to ask abt motor and prop size and efficiency. So I was thinking to get either some 2203.5 motor with 1600kv wingspan of about 1,6m and 16x5 prop(prop lenght of 25%of wingspan), however ...
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  • 21
2 votes
1 answer
40 views

Rewiring 2S2P as 4S

I have LiPo battery that is in 2S2P configuration, however I need higher voltage (4S) battery for my project. From my understanding 2S2P battery has 4 cells same as 4S (2 in series and 2 in parallel). ...
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  • 123
1 vote
0 answers
32 views

Calculate the total energey required to fly drone

How much energy will drone batteries consume if I have the following inputs, By using provided GPS flight path data I've calculated total horizontal distance using Haversine formula, and multiplying ...
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3 votes
1 answer
73 views

Can I use a MJX bugs 5w battery and/or charger for the MJX Bugs 5w 4k (upgraded version)?

I am wondering if I can use the MJX bugs 5w battery for its upgraded version (MJX bugs 5w 4k) as it seems they both are the same dimensions, so it can slide into the drone. Also, I am wondering if I ...
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3 votes
2 answers
206 views

Will wiring two batteries in parallel fry my drone?

Will connecting 2 lipo batteries of 3.7 V of 1500 mAh in parallel for a power source to a drone fry it? I understand the voltage will continue to be 3.7 V because it's in parallel. The current or Amps ...
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  • 381
3 votes
1 answer
88 views

Is it safe to use 18650 battery pack for my setup?

I'm a beginner in FPV hobby. I want to build a 18650 battery pack (4S1P), but I'm not sure what the right cells for me are. Specs: I am using 4xMotors Xing 1404 3800kv which have a max continuous ...
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3 votes
1 answer
51 views

Charge Tello while powered on?

Is it possible to charge the embedded battery in DJI Tello while the drone is powered on, in any state? Eg restart, emergency, landed For example, when I want to keep taking photos (without flying), ...
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4 votes
1 answer
69 views

Are drone batteries more prone to swelling than other li-ion batteries?

I have lithium ion batteries in my cell phones, laptops, portable chargers, and all sorts of devices. Sometimes I'll keep them off for a week or two and when I turn the device on, the charge may be ...
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  • 143
3 votes
2 answers
3k views

What is the power draw of an average 5 inch FPV-drone?

I'm doing a project in school where I'm comparing different batteries for use with an FPV drone. To do that I need to know a how many watts the battery needs to be able to provide. I found this motor ...
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0 votes
1 answer
62 views

Which battery do I need for my drone?

I am totally new to the drone space and I recently acquired a hand-me-down drone without a battery. It has a XT60 male connector type with 4 motors (DL2205 KV=2300).
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  • 21
3 votes
1 answer
518 views

Li-ion battery will not charge on ISDT Q8 Smart Charger

The Li-ion Pack has 4 18650 lithium-ion batteries with a soldered Balancer and XT60. On my ISDT charger, the read out voltage for each battery cell is: 3.17V 3.18V 3.29V 2.93V Whenever I try to ...
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  • 567
3 votes
1 answer
155 views

Can you charge 1s and 2s batteries at the same time with the tinyhawk 2 included charger?

I just got a Tinyhawk 2. It came with 2 batteries (2s and 1s) and a battery charger that you plug in to USB. I know that you can't parallel charge batteries with different cell count, but it looks ...
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2 votes
2 answers
76 views

Would it be possible to inductively recharge a drone battery?

Regular drones can only fly around 15-30 minutes before the battery runs out, which is annoying. Newer smart phones use inductive loading, so it is possible to load a battery through such a field. ...
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4 votes
2 answers
54 views

Is there a way to estimate battery discharge duration from mAh and C-rating?

Lots of batteries are out on the web, and I understand what the values mean. But I would like to get a battery with a good discharge duration, so is there a way to tell an approximate battery life ...
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9 votes
3 answers
3k views

How do DJI drones achieve such long flight times compared to traditional FPV drones?

DJI is able to achieve ~30 minute flight times with their dones. Whereas, a typical FPV drone is only ~7 minutes I see this as a huge achievement by DJI, I am interested to understand how they were ...
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4 votes
1 answer
91 views

How to decide drone motors?

I'm planning to design a quadcopter with a payload capacity of 5 kg. I would need the thrust power from the motors to cater for at-least 7 kg with extra part weights. I would like to know, How do I ...
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  • 149
9 votes
4 answers
4k views

How to revive an over-discharged DJI Mavic battery?

I left my drone on until the battery shutdown. The Mavic battery bottom meter light flashes 16 times when checking charge. When i place the battery on DJI chargers it will not charge and also ...
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  • 423
6 votes
1 answer
62 views

LiPo battery power maximization

I have a 3S1P 2.2A 50C battery for a drone that I build. I have a charger that looks like this: https://www.alibaba.com/product-detail/RC-B3-AC-Lipo-Battery-Charger_60812527463.html At first, when ...
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12 votes
2 answers
1k views

In what situations do puffy batteries pose a risk of ignition?

In this Drones and Model Aircraft SE question, Is it safe to fly LiPo batteries after they get "puffy"?, David O. asked if it is safe to use puffy LiPo batteries. Gparyani provided an ...
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8 votes
1 answer
190 views

What can I do with a LiPo whose balance lead has been destroyed?

I'm starting a bit of a collection of batteries which have been ejected during a crash and ended up with a destroyed balance lead. Is there anything other than disposing of them that I can do, ...
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2 votes
1 answer
60 views

Recommendations for a BLDC motor and battery for a 28x20 propeller?

I'm looking for a motor and battery set up that can last for over an hour and spin the propeller at 6000+ rpm. The propeller is a 28x20 single blade being connected to a second blade for a total of 56 ...
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4 votes
1 answer
177 views

Why do LiPo batteries get puffy?

I have used many liPo batteries with my drones and other RCs over the years and have had a few of them puff up. What are the main reasons that LiPo batteries puff up? And are there ways to avoid LiPo ...
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  • 5,532
3 votes
2 answers
213 views

What LiPo C-rating is best for a small 65mm quad?

I have a small 65mm quadcopter which uses 2s batteries. Is there a recommended LiPo C-rating to get for a drone like this? Or is there some way to figure out what C-rating I should get?
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  • 5,532
3 votes
2 answers
205 views

Is there an advantage to having more LiPo cells in a low-power drone?

A major reason that high performance racing or freestyle drones use LiPo batteries with high cell count (6s rather that 3s or 4s) is so that the voltage won't sag as much. This allows high performance ...
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  • 5,532
6 votes
1 answer
530 views

At what voltage per cell should I store a LiPo?

Some sources say you should store your batteries at 3.85V per cell, other says it should be 3.7V. My charger (ISDT Q6 Lite) on the "Storage" mode has a thumbs-up mark at 3.7V, probably indicating ...
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13 votes
2 answers
4k views

Is it better to have a bottom heavy quadcopter or a top heavy quadcopter when it comes to a quadcopter stability?

Does it matter where the battery is mounted? Or is it best to have the centre of gravity aligned with the propeller plane where the thrust is generated?
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  • 323
7 votes
1 answer
310 views

What should I look for when choosing a battery for my multicopter?

There are many different kinds of battery, many of which have specifications such as capacity, S configuration, P configuration, C rating etc. How do I translate these into knowing what is best for my ...
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6 votes
1 answer
284 views

Is voltage sag safe if the voltage isn't too low?

I know that a liPo cell should never be below 3.0 volts, but can voltage sag during high throttle maneuvers damage the battery excessively even if the voltage it not below that level? And if that is ...
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3 votes
1 answer
288 views

Can you cancel an automatic landing triggered by a low battery on the Dji Mavic 2 Pro?

Whenever the DJI Mavic 2 Pro has a low battery it initiates a function that lands it. Sometimes this can happen when the drone still has a lot of battery capacity e.g. 45%. Is there a way to cancel ...
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12 votes
4 answers
967 views

At what per-cell voltage should I land?

I built 5" quad and I'm using 4S 1300mAh LiPo batteries. My question is: at what voltage should I land? Let assume that I'm trying to land when my battery is as low as it should go without causing ...
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3 votes
2 answers
597 views

Series or parallel connection for drone batteries?

What is the difference between adding two drone batteries in series vs a parallel connection for flying the drone?
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  • 5,532
5 votes
5 answers
326 views

What affects the total flight time for a drone?

What factors would affect a drone's flight time? Battery capacity? Weight? Anything else?
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8 votes
2 answers
363 views

Why do LiHV batteries degrade faster than an equivalent LiPo?

There seems to be a lot of anecdotal evidence, at least on YouTube, that LiHV batteries degrade faster than LiPos. Is this true? I own a couple whoops and only have 1s LiHV batteries since I can't ...
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4 votes
4 answers
162 views

What happens when a multirotor runs out of battery mid-air?

If I am flying a multirotor drone and it runs out of battery mid-air, what will happen to it? Will it just fall down from the sky or will it give me a low-battery warning?
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3 votes
3 answers
158 views

How do I re-charge the batteries of my S49 drone faster when outside?

I have a small S49 quadcopter. After around 10-15 minutes, it often runs out of charge and needs recharging. My charger requires it to be plugged into a portable USB charger or to the mains. I have ...
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6 votes
2 answers
236 views

What are the conditions for LiPo battery damage from undervoltage?

It is widely known that Lithium-polymer cells are permanently damaged if their voltage drops below a certain threshold, around 3.0 volts, but I couldn't find much on the exact conditions and factors ...
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  • 2,897
8 votes
3 answers
1k views

Alternatives to LiPo batteries

LiPo is often the first choice of battery due to its high discharge rate and high specific energy (100 - 265 Wh/kg), defined as its energy per unit mass. In terms of these two characteristics, what ...
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4 votes
3 answers
501 views

Why do higher voltage batteries need lower KV motors?

I've noticed that higher voltage batteries need lower KV motors, why is this?
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7 votes
1 answer
44 views

Methodology and sources for obtaining the correct replacement batteries for low-end RC aircraft

According to Mark's answer to this Drones and Model Aircraft SE question, I likely need to buy quite a few replacement LiPo batteries. Finding large LiPo batteries for expensive aircraft is usually ...
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20 votes
2 answers
679 views

Is it safe to fly LiPo batteries after they get "puffy"?

Some of my LiPo batteries got "puffy" after a few months. Is it still safe to fly them, or should I safely dispose of them?
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  • 435
10 votes
4 answers
204 views

What does the C rating on a LiPo battery mean?

I see LIPO batteries specify a C rating on the label. What does that stand for and how does it affect the performance of the battery?
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7 votes
1 answer
92 views

How to restore LiPo-powered aircraft that have not been flown for years?

I have a bunch of relatively inexpensive battery-powered radio-controlled aircraft that I haven't flown in over a year. I haven't flown some of them in over 3 years. The aircraft are airplanes, ...
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