Solution for Drone Lithium Battery Not Charging
Your drone hasn’t flown in a winter, take it out and see the battery voltage drop to 2.7V – the charger directly refuses to charge. Don’t hurry to throw it away first, this situation is not necessarily scrapped. But after all, LiPo batteries are not for fun. Before activating them, you need to know which ones can be saved and which ones must be given up. This guide will guide you step by step in judging and operating, and finally will tell you where PKNERGY can help you.
Judge first: whether your battery can be saved or not
To be honest, not all “dead” batteries are worth tossing.LiPo is more dangerous than you think, and the consequences of misjudgment are serious.You go through the following table first
| Battery Condition | Can It Be Saved? | What You Should Do |
|---|---|---|
| Slightly low voltage (above 3.0V/cell), no physical damage | Almost certainly yes | Just do a normal balance charge. No need to panic. |
| Cell voltage between 2.5V and 3.0V, battery looks fine | Worth trying | Slow charge at C/10 to wake it up. Watch it the whole time. |
| Voltage below 2.5V/cell but not at 0V | Risky — proceed with caution | NiMH mode wake-up or slow charge. Have fire safety gear ready. |
| Stored unused for over 6 months with no storage voltage maintenance | Hit or miss | Check voltage first. Below 2.5V/cell? Consider letting it go. |
| Cells are swollen, soft, or have a sweet chemical smell | Absolutely no | Stop immediately. Put it in a fireproof bag for safe disposal. |
| Any cell reads 0.00V | Do not even try | Permanently dead. Dispose of it safely. |
| Damaged casing, burnt connectors, or water exposure | Do not touch | Take it straight to a battery recycling center. |
Here I must emphasize that the LiPo of the bulge is not a problem of “can still use it”, but a problem of “can catch fire at any time”. You see the bulge, smell the sweetness (the smell of the electrolyte solvent), find the shell softening, and stop everything immediately. LiPo combustion is not an ordinary fire, it will self-supply oxygen, ordinary fire extinguishers can not hold down.
Why does your drone battery look like this?
Find out why and don’t do it again next time.The drone LiPo battery “crash” usually does not run out of these reasons:
Excessive release – the most common and the most unjust
You were too high when you flew. The low-voltage alarm sounded and you wanted to take another lap.As a result, the cell is pumped below 3.0V, the internal copper ions begin to migrate (this thing is irreversible), and the chemical structure is disrupted.Many chargers detect that a single cell is locked directly below 3.0V, preventing you from charging – it protects you and protects the battery.
The storage voltage is not correct
This is the most common pit for novices.After flying, the battery is fully charged, or the empty electricity is thrown aside – both are injured.The correct posture for LiPo battery storage is 3.75V-3.85V per cell, which is called “storage voltage”.Full electric storage will allow the internal chemical reaction of the cell to continue, accelerating aging; static storage may self-discharge below the overdischarge threshold and directly scrap.
Long-term inactivity
To be honest, many people eat ash after buying a drone.LiPo batteries are not red wine, and the better they are, the better.Even if you do the storage voltage, the cell will slowly discharge itself after more than half a year.If it is not maintained for more than 6 months, it is likely that the voltage has dropped to the danger zone.
Cell imbalance
Your 4S battery is nominal 14.8V, but the actual four cells may be 0.2V or more.If a cell is particularly low, the BMS will trigger protection, and the entire battery cannot be charged.This will either be pulled back slowly with a balanced charge, or the batteries will have to be replaced.
Temperature Tricks
Flying below zero in the winter, or throwing batteries in the trunk of a sunburned car in the summer – LiPo’s performance drops off the cliff in extreme temperatures.Charging below 0°C is more dangerous and may cause lithium dendrites to grow, piercing the diaphragm and causing internal short circuits.
Resolution
Method 1: LiPo Mode Slow Charge
The safest first step.This is preferred if your charger allows charging from less than the 3.0V/ core.
To do this:
Place the battery in a fireproof bag or metal box on a non-combustible surface.
Connect the main power cord and the balance head to confirm that the number of cells identified by the charger is correct.
1. Set the charging current to C/10–5000mAh and use 0.5A for the battery, and 0.15 A for the 1500mAh battery.
2. Start charging, do not leave, take a look at the voltage and temperature every few minutes.
3. After all batteries rise above 3.4V, stop and switch to the normal 1C balanced charging mode for full charge.
4. To put it bluntly is to “feed it and feed it little by little”. Don’t come up and make a big current rush.
Method 2: NiMH/NiCd mode “Wake up”
If the method doesn’t work – the charger says “low battery voltage” refuses to start – try this old player’s usual tricks.However, it must be monitored throughout and can only be used if the battery looks perfectly normal.
To do this:
Connect only the main power cord, do not connect the balancer. This is important.
The charger selects the NiMH mode and estimates the “false NiMH knots” according to the total voltage.For example, 4S LiPo (about 11V-15V) can correspond to 10–12 knots of NiMH.
The charging current is also set to C/10.
The voltage of each cell is monitored in real time with an independent voltage detector (or manually connected to the counterbalance head).
Stop NiMH charging as soon as all cells exceed 3.4V.
Reconnect the balance head and switch back to LiPo mode for normal balance charging.
The principle of this method is to bypass the low voltage protection of the LiPo mode and use the constant current mode of NiMH to hard top the voltage.Effective, but risky.You have to keep an eye on the whole process and immediately cut off the power if you notice a bulge or fever.
Method 3: Warm up and refill
If you’ve just brought it in from the outside in the winter, or the battery has been in the freezer – don’t rush to recharge it.Leave it in a room temperature environment of 15°C–25°C for 2-3 hours, and let the internal temperature of the cell come back up and try again.Many times, “can’t charge” is actually too cold, just warm up.
Method 4: Check balance head and wiring
Sometimes the battery itself is not broken, it is a certain wire of the balance head that is loose or oxidized.Use a multimeter to measure the voltage by core. If the reading jumps around or a core cannot be read at all, check the wiring first.The “false death” caused by poor contact is much easier to repair than real death.
Method 5: Professional laboratory power activation (don’t do it yourself)
Some battery repair shops use an adjustable lab power supply for precise constant current precharging.This thing can precisely control the voltage and current, which is theoretically the safest.However – ordinary users do not have this condition and cannot operate it. If your battery is expensive (such as DJI’s smart battery), rather than taking risks on your own, look for professional repairs.
What can PKNERGY do for drone users?
You may ask: Isn’t PKNERGY doing solar energy storage, and what does it have to do with drones?
It’s a big deal.One of the biggest pain points for drone pilots was what to do if the field ran out of electricity.You take aerial photos in the field, do plant protection in the farmland, do inspection on the construction site – you can’t always find a wire to plug in, can you?You need a portable, safe, and large enough mobile power supply to power the charger and device.
To whom this guide is addressed
Flying hand of aerial photography: You take the businessman out to shoot, the battery suddenly does not give power, Party A is waiting next to you, your blood pressure is full.
FPV player: You take four or five batteries out of the blaster at a time, each of which has to be charged.You need a reliable outfield power supply solution.
Plant Protection/Inspection Flyer: You fly dozens of flights a day, and battery management is your core competency.You need stable charging logistics.
Drone Dealer: Your customers keep asking how batteries are maintained, how they are activated, and where they can get reliable backup power.
Frequently Asked Questions
01 Can LiPo battery voltage be saved below 3.0V?
It depends. Between 2.5V–3.0V with C/10 slow charge there is a high probability that it can be recovered.The risk is high below 2.5V, NiMH mode awakening is required, and fire prevention measures must be taken throughout the process.0V batteries don’t have to think about it, just scrap it.
02 Can the LiPo battery in the drum pack continue to work?
No. Absolutely not.The bulge means that gas has been produced inside and the chemical structure has become unstable.Continued charging and discharging may catch fire at any time.Put the drum battery in a fire bag and dispose of it according to local hazardous waste regulations.
03 Should the LiPo battery be fully charged or dead?
Neither. The storage voltage should be 3.75V-3.85V per cell.The modern smart charger has a storage mode, which can be done with one click.If you do not fly for more than 3 days, you must store the voltage.
04 Can I charge the drone battery with a regular USB charger?
Absolutely not.The drone LiPo battery requires a professional balancing charger. The USB charger does not have a balancing function, and the voltage control is not accurate, so it is easy to overcharge and ignite.This is not a place to save money.
05 How long can LiPo batteries be stored?
The correct storage voltage is done, placed in a cool and dry place, and can be left unmaintained for about 6 months.However, it is recommended to check the voltage every 2-3 months and make up the electricity if it is lower than the 3.5V/ core.
06 Can I charge immediately after flying?
No. The battery that just flew is hot, and charging it directly will increase the risk.Wait until it cools naturally to room temperature (about 15-30 minutes) before charging.
07 How long do LiPo batteries generally last?
Approximately 200-300 cycles under normal use and care.If you often overdischarge, store at full charge, or use at high temperatures, 100 cycles may not work.If the battery life is significantly reduced, it should be considered for replacement.
08 What is the safest power source for charging in the field?
It is best to use a portable energy storage power supply that uses the LiFePO4 chemical system itself.LiFePO4 is much more stable than LiPo – even short circuits or punctures do not burn violently.Charging a “dangerous” LiPo battery with a safe power supply is a straightforward logic.PKNERGY portable energy storage power supply is this idea.
07 How long do LiPo batteries generally last?
Approximately 200-300 cycles under normal use and care.If you often overdischarge, store at full charge, or use at high temperatures, 100 cycles may not work.If the battery life is significantly reduced, it should be considered for replacement.
08 What is the safest power source for charging in the field?
It is best to use a portable energy storage power supply that uses the LiFePO4 chemical system itself.LiFePO4 is much more stable than LiPo – even short circuits or punctures do not burn violently.Charging a “dangerous” LiPo battery with a safe power supply is a straightforward logic.PKNERGY portable energy storage power supply is this idea.
