Recent Posts

1

GS-911 / Re: Any remedy if getting 'over-voltage' warnings with a NOCO NLP14 lithium battery?

« Last post by botus on April 15, 2026, 08:14:38 PM »

The dealer ability to change battery type to Lithium will only apply to the models BMW have programmed into the ECU's the ability to do so

lithium batteries are generally a huge nuisance - they hate cold weather - I believe all the UK R1300GS's that came with a lithium battery are getting a free replacement back to the better normal battery - as the lithium ones are causing too much aggro

if you want to try and fight a lithium one, on a non lithium spec bike - you need one that's specifically designed with a built in BMS (battery management system) that was designed for older bikes - and don't expect it to behave if temps are less than 12C (more like >16C)

I figured you cannot change the voltages, and neither on a car. But changing the battery type takes care of any voltage differences, along with setting the proper Ah rating.

Its becoming more common on many car brands (been part of the BMW car world for 20 years) that you need to code in a new battery - With is battery type and Amp/Hr rating etc. - so its charging algorithm is optimised

And as Wayne states, these later BM bikes need coding if you swap the battery over to the other battery design, so they can try to cope with life - and on the R1300GS there is a specific order to connect up a 3rd Linbus connector or Lithium ones can't behave even on a good day

2

GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by botus on April 15, 2026, 08:09:34 PM »

From your reply it appears the 12.5 volt requirement is driven by the complexity of the latest models.  My 2007 ST never had a problem with lower threshholds.  Hex should make the operating threshhold model-dependant.

just because it appeared to work - doesn't make it a good idea - I have a 2007 R1200GS and I get twitchy if its dropping under 13v - if just scanning for codes - you'll just get more and slide in a spiral of annoyance - if trying to do any real work like coding a Tyre pressure sensor - get the volts up

I thought in the recent updates there's a toggle to change how it nags you ?  I'd leave it std and get the volts up either way

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GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by WayneC on April 15, 2026, 11:11:54 AM »

From your reply it appears the 12.5 volt requirement is driven by the complexity of the latest models.  My 2007 ST never had a problem with lower threshholds.  Hex should make the operating threshhold model-dependant.

As I stated in  th OP's other thread, the minimum voltage can be set by BMW in the ECU firmware so it is best to ensure 14v  regardless of  the model, BMW specify 1v on the cars & 13.5v for the bikes in the Dealer System

4

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5

GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by karlh on April 15, 2026, 12:20:52 AM »

From your reply it appears the 12.5 volt requirement is driven by the complexity of the latest models.  My 2007 ST never had a problem with lower threshholds.  Hex should make the operating threshhold model-dependant.

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GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by botus on April 14, 2026, 12:01:56 PM »

as various elements of the bike's systems do stuff the volts jump about - bike batteries are pathetic low capacity things - BMW dealer tools have high current posh "power supply" devices that hold the voltage right up there - the ISTA stuff has a 15 Volt minimum threshold for programming - below that things don't behave and the tool isn't meant to even operate

the newer bikes really need high volts, for the suspension especially - I'm surprised a CTEK charger I'm using mostly manages to hold the bike at 14.2V...

if you are dropping below 12.5 V expect things to go wrong - I doubt Hex increased the volt demand for the tool to operate - but its perfectly reasonable, if the system needs it, their tool needs to respect it - the idea is to service the bike not to introduce software issues

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GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by Skim on April 12, 2026, 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.

8

GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by JCtx on April 12, 2026, 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.

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GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by Borgia on April 12, 2026, 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.

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GS-911 / Re: Why was the minimum voltage increased from 12.0 to 12.5V???

« Last post by JCtx on April 12, 2026, 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.