Looking for information, specs, interface doc about the AS15B3N battery for my PREDATOR G9-793

Hi,

The battery of my PREDATOR G9-793 from March 2017 is getting old, so I want to replace it with a new one.

After Acer had told me they don't sell it anymore (5 years... seems there is some improvement to be made to reduce e-waste in this world...) and provided me with a part number (KT.00803.005) I've ordered one from BattDepot.

I experienced an issue where at the end of the charging process the LED would turn "blinking yellow" instead of the expected "fixed red."

Acer says this means "critical level" or "battery dysfunction" so I asked BattDepot for a replacement.

The new battery had no problem for the first half-dozen charge/discharge cycle but I'm back to the "blinking yellow" state.

Where can I find information about the interface between battery and motherboard (there are 4 wires in addition to the GND and V+ connections) so that I can attempt to understand what's going on?

TIA for your help.

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JackE

>>>Where can I find information about the interface between battery and motherboard (there are 4 wires in addition to the GND and V+ connections) so that I can attempt to understand what's going on?>>>

Sorry, this kind of detail usually only available from vendors who sell mainboard schematics like http://laptop-schematics.com/ My experience is that they charge about $20usd each. I haven't found the diagrams to be particularly useful for troubleshooting charging issues like this.

However, if you still have your old battery and it does not exhibit the blinking amber like the two replacements you got from BattDepot, then I would guess that you lucked and got two lemons from them. It happens. Especially if these batteries have been sitting unusued on a shelf for a few years since manufacture.

You might want to do this battery report on your newest lemon and the old tired one if you still have it.

(1) Search 'cmd' in Windows start menu.
(2) Right click command prompt near top of menu.
(3) Click run as administrator.
(4) Enter 'powercfg /batteryreport' at command prompt.
(5) Then return to the desktop. Open file explorer.
(6) Then search for' battery-report.html' in the c:\windows\system32\ sub-folder. Double-click to open it in the browser.
(7) Post screenshot of the first part of the report if possible that compares design full charge capacity with its remaining full charge capacity.

sba923

JackE said:

>>>Where can I find information about the interface between battery and motherboard (there are 4 wires in addition to the GND and V+ connections) so that I can attempt to understand what's going on?>>>

Sorry, this kind of detail usually only available from vendors who sell mainboard schematics like http://laptop-schematics.com/ My experience is that they charge about $20usd each. I haven't found the diagrams to be particularly useful for troubleshooting charging issues like this.

However, if you still have your old battery and it does not exhibit the blinking amber like the two replacements you got from BattDepot, then I would guess that you lucked and got two lemons from them. It happens. Especially if these batteries have been sitting unusued on a shelf for a few years since manufacture.

Thanks for the pointer about schematics; I might want to look at them just to satisfy my engineer's curiosity...

The batteries I got from BattDepot do not have an issue with their full charge capacity, so the blink yellow light oughta mean something different. Temperature issue? Other abnormal condition reported via the SMBus?

Image: https://us.v-cdn.net/6029997/uploads/editor/cq/42ei1gcgktyy.png

JackE

Do you still have the old battery to see if the blinking ceases?

sba923

Yes I still have the original battery (I'm going to return the other 2 to BattDepot for a refund), it doesn't exhibit this (undocumented, BTW) blinking yellow LED behavior, and never has.

The motherboard schematics tell me that the entire charging process is implemented around a TI BQ24780SRUYR, but that doesn't control the yellow (charging) LED. The IT8587E/FX microcontroller that seems to implement the whole power infrastructure does it.

Still digging...

JackE

The blinking is documented but suggests a low power unplugged state. It most other laptops, it might also suggest an abnormal battery or charge condition.

Image: https://us.v-cdn.net/6029997/uploads/editor/xt/0swcaq9k59b4.jpg

sba923

JackE said:

The blinking is documented but suggests a low power unplugged state. It most other laptops, it might also suggest an abnormal battery or charge condition.

That doc refers to a different model. My G9-793_1132_1.14 has a combined red/yellow (amber) LED, not a blue/orange one:

Image: https://us.v-cdn.net/6029997/uploads/editor/5i/l9zs3m8qop45.png

I'll test what happens with the original battery when it's low and the charger's not connected. Might be that the LED is indeed blinking yellow. But that condition when the charger is connected is not documented anywhere

JackE

This is from a specsheet for the same model that usually shows more detail than the user manual that ships with the machine. The power LED also has more blue blink code functions that aren't documented on line either, not even on the specsheets. Lots of undocumented mainly BIOS firmware related low level functions and features that you're not likely to easily find on proprietary mainboards.

sba923

JackE said:

This is from a specsheet for the same model that usually shows more detail than the user manual that ships with the machine. The power LED also has more blue blink code functions that aren't documented on line either, not even on the specsheets. Lots of undocumented mainly BIOS firmware related low level functions and features that you're not likely to easily find on proprietary mainboards.

Seems there are several flavors of the G9-793.

At least the user manual I have downloaded refers to colors that match the actual hardware and the schematics 😆 where the control signals for the LEDs are labeled CHG_LED_RED_LED / CHG_LED_YELLOW_LED.

JackE

We call them submodels in the G9-793 model series. Yes, there can be dozens of submodels. Further complicated by the fact that production changes and variations can happen without notice in different countries and regions.

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