Just been out and checked, the standard battery on the 1250RT is an Exide 12/16. This is the battery BMW re badge. It is 16amps, clue is in the number of course 12/16.
Battery critical update !
- Thread starter Gs12bos
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Just been out and checked, the standard battery on the 1250RT is an Exide 12/16. This is the battery BMW re badge. It is 16amps, clue is in the number of course 12/16.
Tayna says the battery was switched when the 1200 came in from the 19Ah job on the 1150 to a YTZ14S or equivalent. These have 11Ah but can deliver 250CCA. Remember, when the 1150 battery was specified, it was a wet battery that had a lot of storage but only had 100CCA for starting.
On my R1250GS, I fitted a Yuasa YTX14H-BS, which is the heavy duty version of the standard battery, has a CCA of 210 so turns over a bit quicker and starts better when cold.
AberdeenAngus
Registered user
And how many hours are there in a week? …168. So in two weeks that 336… and a battery won’t start the bike if it’s much less than half charged.
35mA drain is nearly 12Amp hours in two weeks. If you think that is acceptable then good luck to you.
FFS what a side show. I was just stating what BMW consider to be an acceptable parasitic drain. Anything unto 35mA they won't do anything about and won't consider it to be an issue. So unless there is no drain, keep the bike on an optimiser. I keep my bike on an optimiser. So yes I do think unto 35mA is acceptable if you have trackers, and other things connected to the bike that need power. What I can't understand is why I'm bothering to respond to you!
Wow……you get a perfectly civil response, and then go all sensitive because you’ve been proved to be wrong in you ‘calculations’.
It is quite clear that the battery can fail to start the bike after 2 weeks.
Suck it up, say ‘oooh yes, actually you are correct’, learn something, and move on.
Getting shitty, because you are incorrect, makes you look like a prune
AberdeenAngus
Registered user
What I’m saying is that BMW do some shonky design then fob us off by saying ‘that’s normal’.
I did agree with you in saying the drain is unacceptable unless it’s doing something useful e.g. alarm/tracker.
It’s all good buddy
Didn’t mean to rattle your cage.
Wow……you get a perfectly civil response, and then go all sensitive because you’ve been proved to be wrong in you ‘calculations’.
It is quite clear that the battery can fail to start the bike after 2 weeks.
Suck it up, say ‘oooh yes, actually you are correct’, learn something, and move on.
Getting shitty, because you are incorrect, makes you look like a prune
Whatever - my calculations are not wrong. The statement was "35mH will flatten a battery in two weeks" That is incorrect, if the statement was "35mH will not provide enough juice to start a bike after 2 weeks" then possibly. But my bike has a 30mH parasitic drain, and I leave it off the optimate for 3 weeks at a time to give it a break, and guess what it starts, so clearly the battery isn't flat. The whole point was BMW agree that unto 35mH parasitic drain is acceptable, which was the original statement. Sensitive, lol, get a life.
Lol, get a life?…….says the guy arguing that a battery that’s not flat but won’t start the bike is anything more than a feckin useless paperweight
Bradz
Registered user
Hi, I believe you mean mA (current) not mH (inductance).
The fact remains that a standard factory fitted 1250GS battery will be so flat after 2 weeks on non use that it will not start the bike - this was never the case with any of my 5 previous 1200GS’s. I now use a BMW charger when the bike is in the garage.
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