@djibattworkshop

 The battery and the PCB are shown in the pic. Has many chips along with the TI BQ3055 Chip, like the DJI and other professional drones.

@thomasmfazekas 

Check the license again.

Posted by: @thomasmfazekas

Design Capacity at 2350 mAh. I would like to change it to 4480 0r 4000 mAh

 This battery uses double sense resistor. 

It means current value is measured with 1:2 ratio. To keep all calculation correct all capacity parameters are preprogrammed with same ratio. 

2450 * 2 = 4900mAh 

This value is printed on battery label. 

So it is programmed correctly. 

Posted by: @thomasmfazekas

I can only get about 8 minutes of flight time

 Design Capacity has nothing to do with flight time prediction or charge percentage calculation. It is used only at drone start up to check if correct battery is inserted. Changing Design Capacity to any other value other then used by Pack Maker could cause battery error in the flight app. This is the case for most of DJI batteries. Autel could use similar approach. 

Out of curiosity you could change it a bit just to check drone behaviour. In case of app error return it back to factory value. 

Parameter which is responsible on correct percentage calculation is known as Full Charge Capacity. It is dynamic value which depends on many parameters like cells condition, resistance, load etc. Now it stores the value 806 * 2 = 1612mAh of previous cells, thats why chip thinks that old cells is used and you getting small flight time. 

 After chip is unsealed, change it in bqEVSW tools to value which corresponds to real capacity of new cells under the load. You could use 4000 / 2 = 2000mAh value for initial iteration. 

 Also keep in mind that Dji P3 cells dont like to be discharged beyond 3.3v so return to home and land a bird in time by monitoring cells voltages in the app. Additionally you could reprogram EDV constants in the eeprom to let the chip know that LiPoHv cells are used. Then it should calculate percentage properly because it would know updated low voltage limit. 

Thanks for the response. Very informative. I still have not been able to unseal this chip. Any Idea's. ????

 According to Nicusor support for bq3055 was enabled. 

Try this 

- Start New Reset, press Next 

- Press Read Chip Info button 

- Press Unseal button 

- Press Read Chip Info button 

Paste snapshot. 

@djibattworkshop         Here's the snapshot you wanted. If you notice in the log it detects BQ3055 FW v0.04 which is correct. Then if you look at chip selection you see BQ20ZXXX. When I give it the unseal command it reports "Error while unsealing the Chip Code = 13. Note that I am using EV2300 and not the NLBA1 device.

To unseal the chip, first switch off a battery by push-button so indication is not lit. 

 There is msp430 MCU on other side of pcb continuously communicating with bq3055. Chip could not be unsealed when two bus master talking with one slave. 

@djibattworkshop

The only way I could communicate via the SMB bus was to turn the battery on, unlike the DJI Phantom 3 Battery where I read the SMB bus with the battery off. There are two sets of test points on the Autel PCB (SMDA, SMCK, and GND), I could not read the SMB bus on or off. The other test points SDA2, SCL2, GND I could only read the SMB bus by turning the battery pack on. Hope this helps.

I can read all the registers on the DJI BQ30Z55 via the EV2300 using both the NIP app and the TI BQ Studio software. The BQ Studio allows me to unseal it and change any variable in the "Data Flash".

Measure the voltage with multimeter on the NLBA1 front connector D and C terminals in two cases 

 - battery is On 

 - battery is Off 

@djibattworkshop 

I have just tested a PCB with bq3060 which has the same core as bq3050 and bq3055 and everything works well:

 It is laptop pcb with only one chip. 

 Drone battery has MCU msp430 chip on same bus which communicates with bq3055 when battery is switched on by push button. In such scenario Nlba1 could not unseal fuel gauge because non relevant commands sent to MAC register by another bus master. 

@djibattworkshop

Note that I am using EV2300 and not the NLBA1 device.

Ok. Measure the voltages on SDA, SCL terminals of ev2300 adapter when battery is On and Off by push button.