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battery not charging

Playakiin

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I have a drone tello. I tried it and it worked fine, but then the 4th time I tried to use it, I charged it with a fast charger and my battery got swollen. In the DJI store here in Cancun, recomended me to charge it with the computer and buy a new battery. I bought a new battery. I plug it with the computer and never got charged, then I plug it with a charger of 5 V 1 ampere and it didn´t got charged. I read the manual and it says that it has a safety feature that the drone doesn´t allow to over charge it, But then why it got swollen the first battery. Then I read the manual again and it recommended that the charger should be 5V 2 amperes or more. I used it. It blink as it should slowly blue. I waited 2 and a half hour, although the manual says it should be done in 1 1/2 hour, but I tried to turn the drone on, but didn´t work. I started the application of the drone in my phone and it shows a empty red battery. What am I doing wrong?
Is there a way to check if the battery is fully charged?
Please help
 

Flydrone

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My advice is to charge the batteries externally from the tello with the original charger and a 5 Volt 2 Amp power supply.
the fully charged battery must have a maximum voltage of 4.35 volts and must not drop below 3 volts during discharge.
You can check the voltage directly from pin 1-3
The battery swelled because it was badly charged. When you are not using the drone, do not leave the batteries charged or discharged, but take them to 3.85 volts.

981617_1.jpg dji-tello-batteria-litio-1100mah.jpg
See example of voltage reading.
View attachment 20201003_142556-01.jpeg
 

Playakiin

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Thank you very much, I will check as soon I am at home. Even though is a new battery and haven't use it, but since I've tried to charged it several times, I hope I haven´t over charged it. Is there a way to know if it´s still working? to me it looks that is starting to swell a little bit.
 

Flydrone

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I have been using the DJI external charger for years and I have never had problems with swelling ... if the battery is not faulty it is difficult for it to swell during a charge with a specific charger.

Never underestimate the danger of lipo batteries, even if it is small and seemingly harmless, but if it swells excessively it can catch fire at any moment and hurt you or worse (remember it burns very fast and at high temperatures, so it's a moment does damage).

1 - NEVER charge or discharge the batteries too much ... they would be irreparably damaged (3V the cell discharges !! 4.2V / 4.35 for the LI-HV the cell is charged !! never go out of this range)
2 - NEVER keep the batteries charged or discharged for too long (1-2 days). The battery MUST be "stored" when not in use, which means that the Battery must always be kept "half charged" when not in use (3.80 V and 3.85 Volt).
Leaving a discharged battery, or worse charged, for a few weeks stresses its chemistry, compromising its duration. The advice is to charge the batteries the day before their use or the same day and store them after each flight at 3.80 V. This type of accumulators have a minimum self-discharge and are able to maintain a charge for a long time.
 

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