GW Instek GDS-200 / 300 replacement battery 7.4V code FT8862103P

[Kiriakos GR]

Not an easy job, but its possible.  

Its on my character feeling responsible for any action of my.
So I feel the obligation to write few things. 

PCM controller over this scope, the hart this is an Texas Instrument controller.
This is named as fuel gauge.
Total design this is complicate, from the battery connector (4Pin) the wires are used for:

1) Pack +
2) Serial Clock Input
3) Serial Data Input
4) Pack -

PCM controller this is factory programed, so to handle cells of 6100 mAh capacity.
I got 10000 mAh cells, and I had to make a hack, so this capacity to be recognized.
Entire PCM this is custom design, ODM of this PCB he is untraceable, and you cannot find a spare one.

My advice at true experts at electronics repairs.
Go for 6100 mAh capacity , so this to match PCM programing.
Battery metal plate this is of steel, you will need huge patience and lots of isopropyl alcohol, so to remove the glue pads underneath.

PCM controller this supports self learning.
Charge first the new pack.
Lets it discharge until it shut down.
In theory, after these two cycles, the Fuel gauge this will return back to accurate measuring.

This is the last pack of information's, that I do share in public.
For anyone afraid s taking serious risks, he better pay the full price at the local authorized GW Instek distributor, so him to take the money and the responsibility, at returning back to you a functional oscilloscope.     

Good luck at what ever you decide.     

[overvolt]

What any one else will decide, this is his business.

Lets stick at the local good news. 
What is the new runtime, with these fresh 10000 mAh? 

[Kiriakos GR]

First test = 6 Hours 50 Minutes

There is no second GDS-320, with such long runtime over this planet. 
I am extremely satisfied with the result of all my choices.

Even my choice of AliExpress seller, this also turned as success.
Great communication, and collaboration so I to get specific brand and batch of goods.

PCM controller calibration, this is now completed.
Tomorrow I will run the second test, as final confirmation.

[Andrew-88]

I think that the second test, this will be more representative of actual GDS-320 charging system and battery pack performance.
From discharged state to fully charged, the handling (charge rate) will be according to specific PCM controller specifications.
As it was happening, when this PCM was in control of the older 6100 mAh capacity.

(Along the chemistry of the new pack, this will be almost 100% activated.)

[Kiriakos GR]

Second test = 6 Hours 55 Minutes   +5M than before. 

GDS-320 charging system this cannot stress the newer and larger in capacity cells.
These can handle double the charging current.

Either way, after and of this second test, I did gained enough confidence, the condition of the new cells this is excellent.