<p>The answer to this varies depending on who you ask.</p>

<p>It is useful to think of it as voltage/cell.</p>

<p>I’ve seen estimates that say you should stop discharging when each cell in the battery reaches 3.3V as the lowest value. Some people, for example in Joshua Bardwell’s Wizard TS215 video (or possibly the Wizard X220HV video), say that you should stop when the battery sag recovers to 3.7V.</p>

<p>I personally fly my batteries to the minimum safe voltage as stated above, however as far as I am aware there is no set limit.</p>

CC BY-SA 4.0
2020-04-14T20:14:13.973Z
2020-04-21T04:42:51.687Z
2020-04-21T04:42:51.687Z
Drones and Whatnot
<p>The short answer is that you don't want to run batteries below 3.0V ever, and ideally want to avoid large current draw below 3.5V. For a 3S battery, once you start seeing voltages in single digits (3.33V/cell is 10V, below that), it's time to land as a quick reference point - although you can set more precise values of around 10.6V as the warning point through telemetry at a transmitter and/or OSD on an FPV display.</p>

<p>The real issue you're trying to avoid here is that in the Lithium-CobaltOxide (LiPO battery chemistry), below 3.0 volts (can be 2.8V or so in Li-Ion batteries), the battery starts plating lithium permanently onto the anode reducing the capacity and discharge performance of the pack.  Doing this greatly harms the battery, so avoid that at all costs.</p>

<p>The reason I reference the 3.5V point is that typically you have another 10% of battery capacity left in order to affect a safe landing approach pattern without being under time pressure to land quickly, and make a good safe landing - also under load, the battery that is at 3.5V in flight will tend to recover to 3.7-3.85V depending on craft and setup, which is more appropriate for storing a battery as you travel back home to the bench charge the battery to its proper storage voltage (3.8V).</p>

CC BY-SA 4.0
2020-04-14T20:16:14.787Z
2020-04-21T04:42:20.817Z
2020-04-21T04:42:20.817Z
Tehllama
<p>What is the minimum voltage I can safely discharge a LIPO battery during a flight?</p>

<p>For example, if I have a 3S LIPO battery, should I be aiming to land my RC plane before the battery gets below a certain voltage?</p>

<p>Related to that, is it the voltage under load that matters, or the open/resting voltage once it is disconnected?</p>

CC BY-SA 4.0
2020-04-14T20:14:20.183Z
How much weight and what are your motors?
anonymous2
<lipo-batteries><battery-safety>
How low can I safely discharge a LIPO battery during flight?
Daniel Ballinger
# How low can I safely discharge a LIPO battery during flight?

(Asked by: username_0 on 2020-04-14)

What is the minimum voltage I can safely discharge a LIPO battery during a flight?

For example, if I have a 3S LIPO battery, should I be aiming to land my RC plane before the battery gets below a certain voltage?

Related to that, is it the voltage under load that matters, or the open/resting voltage once it is disconnected?

**Tags:** lipo-batteries, battery-safety
> **Comments:**
> **username_1**: How much weight and what are your motors?  

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## 2 answers

### Answer by username_3 on 2020-04-14. Score: 10 | Accepted answer

The short answer is that you don't want to run batteries below 3.0V ever, and ideally want to avoid large current draw below 3.5V. For a 3S battery, once you start seeing voltages in single digits (3.33V/cell is 10V, below that), it's time to land as a quick reference point - although you can set more precise values of around 10.6V as the warning point through telemetry at a transmitter and/or OSD on an FPV display.

The real issue you're trying to avoid here is that in the Lithium-CobaltOxide (LiPO battery chemistry), below 3.0 volts (can be 2.8V or so in Li-Ion batteries), the battery starts plating lithium permanently onto the anode reducing the capacity and discharge performance of the pack. Doing this greatly harms the battery, so avoid that at all costs.

The reason I reference the 3.5V point is that typically you have another 10% of battery capacity left in order to affect a safe landing approach pattern without being under time pressure to land quickly, and make a good safe landing - also under load, the battery that is at 3.5V in flight will tend to recover to 3.7-3.85V depending on craft and setup, which is more appropriate for storing a battery as you travel back home to the bench charge the battery to its proper storage voltage (3.8V).


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### Answer by username_2 on 2020-04-14. Score: 1

The answer to this varies depending on who you ask.

It is useful to think of it as voltage/cell.

I’ve seen estimates that say you should stop discharging when each cell in the battery reaches 3.3V as the lowest value. Some people, for example in Joshua Bardwell’s Wizard TS215 video (or possibly the Wizard X220HV video), say that you should stop when the battery sag recovers to 3.7V.

I personally fly my batteries to the minimum safe voltage as stated above, however as far as I am aware there is no set limit.


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