Welcome to the forum!
Yes, it looks like a battery controller caught Permanent Failure flag due to deep discharge. It could be cleared using our remote service. You should have usb-smbus compatible adapter like Silabs CP2112 or Cypress FX2LP boards. Also Windows machine with AnyDesk software.
But there are some key points which should be clarified before unlocking the chip. Having in view battery was not used for about 2 years cells should be carefully checked for subject of self-discharge rate and swelling signs.
What was initial cells voltages when you just opened the battery for repair?
Hope you remember the value.
Its important to know it as its directly related to cells performance after recovery. Completely zero-volts cells even after precharging will not hold enough charge to power the drone.
Another point is cells recovery method. They should be precharged using Lab Power Supply by small current until they reach minimum safe level about 3v per cell. Then current could be increased.
Hi @djibattworkshop:
The full voltage it started with before I (partially) recharged it was 7.8V. I did not measure the individual cells' voltages at that point I am afraid.
I recharged it 'the cheap way' from the DJI supply (~17.4V), making sure I don't exceed 100 mA charging current by connecting the battery to the charger through some 1W resistors I had -- I don't do much lab stuff at home so I don't have a lab supply and a balanced charger was like 40-50usd, not worth it for just saving one battery. I started with 100ohm resistor, giving just under 100 mA charge current. The voltage went up quite fast to start with (and the resistor was quite hot !!). Once I got to 12V I switched to charging through a 47+10 ohm pair of resistors in series, still <100 mA charging current.
As the voltage went up I also measured from time to time the voltages per-cell and I am a little encouraged that the voltages were quite well balanced, the last time I measured it had 3.25, 3.27, 3.26, 3.24 V on the 4 cells (13.02 total). I then continued charging it up to 14.4 V total (but I did not read the per-cell voltages at the end). So it charged at a rate about 1.2W and it took maybe 1-1.5 hours (I haven't measured the time exactly, sorry). So maybe about 2-2.5 Wh went in to get it from 7.8V to 14.4V, which is 3-4% of its nominal capacity. The battery did not swell and did not noticeably warm up at all during this charging.
Your recovery method is Ok for home use.
For remote unlocking you will need to connect GND, SDA, SCL pins of CP2112 adapter to appropriate pads on battery pcb.
DJI Phantom 3 battery was in production with different PCB revisions. On this pictures its shown points for DJ01-ROF PCB.
Not to be confused with same marked pads on battery connector which in fact are Rx and Tx lines of UART interface.
Hello, how can I reset the battery chip? how to do it? how much does a remote reset cost?
can you connect through UART or not? i have for UART -> usb
do you need to buy this?
Hello, how can I reset the battery chip?
It depends on how many battery you want to reset. For many batteries its better to buy a yearly license, for one battery there is remote unlocking service.
how to do it?
First you should rectify the reason of the fault. Otherwise chip will be locked repeatedly. If cells are swollen they should be replaced, if they are deeply discharge but above zero-volt level they still could be recovered by Lab Power Supply.
how much does a remote reset cost?
$15
can you connect through UART or not?
no
do you need to buy this?
It is CP2112 adapter. Yes, it could be used for remote reset. Alternative hardware you could use
- Cypress FX2LP
- TI EV2300
- TI EV2400
You need to reset two batteries. in 1 there was a replacement of the can as it was swollen, the rest 3 were normal. when disassembling 3 banks were 3.6 volts and one swollen. in 2 swollen no. just one bank dropped to 2.3 volts the other 3.6 volts. the one that was 2.3 volts, I raised it to laboratory blocks. holds 3.6 volts.
I'm interested in remote reset.
that picture above. it's CP2112 him. does it fit?
Yes, cp2112 is Ok for remote work.
good afternoon. I have it already cp2112 . how to contact you? Telegram or what?
post your WhatsApp or email
@djibattworkshop Do you still offer the service to reset the pf flag on a Phantom 3 battery? If so, what is the current pricing and required hardware (CP2112)? I have opened up my battery, recharged the cells with a low current (<100mA), the cells are good and they hold their charge. Cause for PF flag: did not use the drone for a long period (3 years)
Do you still offer the service to reset the pf flag on a Phantom 3 battery?
Yes, price is $15 per battery.
and required hardware (CP2112)?
Yes, it could be used.
Hi I have 2 locked batterys for phantom 3 they not charge and i have cp2112 can you unlock them remoutly ?
Yes. But first cells must be charged, balanced and checked for self-discharge rate. Otherwise chip could be locked repeatedly after several cycles if cells are in poor condition.
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