Author Topic: Why was the minimum voltage increased from 12.0 to 12.5V???  (Read 354 times)

JCtx

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Why was the minimum voltage increased from 12.0 to 12.5V???
« on: April 11, 2026, 05:00:04 AM »
Just saw a video of a transmission calibration with a GS-911 where the threshold was 12.0V (software version 2502.3). Just like me, the guy had his battery fully charged, and after also hooking up a charger, his voltage dropped to 12.4V almost immediately as well. The difference is he could do everything. With 12.5V, it aborts everything. So why did you guys increase it, and by that much??? Never had an issue with the GS-911 for about 3 years with the lower voltage. Don't even remember what it was the minimum, but it was never triggered. Now I can't do squat with an AGM battery, PLUS a charger.

Hopefully it can be reverted back to 12.0V. Or at least 12.3V, which should be fine with a charger connected. Please let us know. Thank you.

WayneC

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Re: Why was the minimum voltage increased from 12.0 to 12.5V???
« Reply #1 on: Today at 03:21:18 AM »
Just saw a video of a transmission calibration with a GS-911 where the threshold was 12.0V (software version 2502.3). Just like me, the guy had his battery fully charged, and after also hooking up a charger, his voltage dropped to 12.4V almost immediately as well. The difference is he could do everything. With 12.5V, it aborts everything. So why did you guys increase it, and by that much??? Never had an issue with the GS-911 for about 3 years with the lower voltage. Don't even remember what it was the minimum, but it was never triggered. Now I can't do squat with an AGM battery, PLUS a charger.

Hopefully it can be reverted back to 12.0V. Or at least 12.3V, which should be fine with a charger connected. Please let us know. Thank you.

It would be best to lodge a support ticket with Hexcode https://www.hexgs911.com/contact-us/ as the explanations of the reasons for maintaining voltage have not satisfied you & continuing to post on the forum will not ewsolve anything

JCtx

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Re: Why was the minimum voltage increased from 12.0 to 12.5V???
« Reply #2 on: Today at 04:59:54 AM »
What explanations??? I haven't seen any. On my other thread, I asked about issues with a lithium battery, and just mentioned a reason to buy it is because I couldn't use the GS-911 anymore with it. But I'm asking here why the voltage was increased, since nobody has ever reported a voltage issue on the BMW forums I follow.
But guess will ask at that link, and see what happens. But if there are any explanations here, I'd love to read them.

Borgia

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Re: Why was the minimum voltage increased from 12.0 to 12.5V???
« Reply #3 on: Today at 06:24:18 AM »
Maintaining a minimum voltage when performing diagnostics must be a fairly common thing as there are battery chargers having a specific "power supply" mode just for that purpose. My Optimate 7 has this mode.
Hey BMW: No service manual = no new bike.

JCtx

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Re: Why was the minimum voltage increased from 12.0 to 12.5V???
« Reply #4 on: Today at 07:31:26 AM »
I took a different approach: I spent $180 on a LiFePO4 battery (and specialized charger), in part to solve the GS-911 issue, especially if I need to use it on the road. But my point was why increase the minimum voltage required to begin with, when it wasn't a problem before. Seems stupid having to either buy a new lithium battery, new charger, or both, for something that was never a problem. Seems crazy, so just want to know why it was done, if not too much to ask.
Anyway, I already asked that question via the link provided above, since that guy didn't want me to post here, so I won't come back. If they lower the voltage again, great. If not, then it is what it is. Take care.

Skim

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Re: Why was the minimum voltage increased from 12.0 to 12.5V???
« Reply #5 on: Today at 12:19:20 PM »
I'm no expert at this. Just wondering, considering the changes that can be made to displays and other settings on the newer bikes... I would assume it's of critical importance to maintain good voltage to ensure update coding is not interrupted/corrupted. Even on my 2010 parraffin model, maintaining correct voltage is a bit of a PITA but learned to live with it now.