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Old 06-06-2012, 11:44 AM   #1
DiabloADV OP
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Airhead battery

What is the smallest battery that will reliably start an R90/6 that has a solid charging system? I mean physically smallest. Don't care about weight. Just dimensions.

On that note, has there been any consensus about the Li-iron batteries?
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1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1970 R60/5

'91 Bill Holland Steel w/Dura Ace[/SIZE]
'01 Z3 3.0 Coupe. The Clownshoe.
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Old 06-07-2012, 09:32 PM   #2
Rucksta
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I killed a 7amp Odyssey AGM in years running a valeo started.
I'll try Lithium next.
It will have to be more than 7 amp equivalent

Some of the Li batteries have a maximum charge rate at a significantly lower
value than the output of a std airhead alternator.
Make sure yours are up to the job from your enhanced alternator.
I think failure to do this is where the exploding Li battery stories originate.

As for consensus - no idea
There is a thread either here or in garage where a guy is testing different battery types.
Might pay to have a look for a wide sample of opinions
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Old 06-08-2012, 08:20 AM   #3
bikecat
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There is a link on ADV about a guy testing shorai on R80G/S.
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Old 06-08-2012, 10:27 AM   #4
yaktackler
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Shorai battery install

I put one of these shorai batteries ( http://www.shoraipower.com/p-152-lfx14a2-bs12.aspx) in my 90/6 about 2 months ago and It has been a champ. It is tiny. I wanted one to fit under the seat. I was worried about the cranking power but it has been perfect.
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Old 06-08-2012, 10:33 AM   #5
bmweuro
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For a standard lead acid or AGM battery I wouldn't use anything less than a 17 amp hour battery.
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Old 06-08-2012, 11:40 AM   #6
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Quote:
Originally Posted by bmweuro View Post
For a standard lead acid or AGM battery I wouldn't use anything less than a 17 amp hour battery.
That's good to know. Isn't the stock recommended battery 30 Ah?
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1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1970 R60/5

'91 Bill Holland Steel w/Dura Ace[/SIZE]
'01 Z3 3.0 Coupe. The Clownshoe.
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Old 06-08-2012, 11:42 AM   #7
bmweuro
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Quote:
Originally Posted by DiabloADV View Post
That's good to know. Isn't the stock recommended battery 30 Ah?
Correct, but R65, /5 and some K75 models used a 18-20 AH battery stock from BMW.
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Old 06-08-2012, 02:47 PM   #8
disston
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I looked at the Shorai battery at a dealer's parts counter this past Spring. It was $300. I didn't get it.
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Old 06-08-2012, 03:02 PM   #9
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I don't think I need to go the Shorai route to do what I want. I just want to squeeze a battery into a smaller space, maybe under the gearbox.
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1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1970 R60/5

'91 Bill Holland Steel w/Dura Ace[/SIZE]
'01 Z3 3.0 Coupe. The Clownshoe.
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Old 06-08-2012, 03:07 PM   #10
yaktackler
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Ended up paying $151.95 (with shipping) from atbatt.com - service was good - They said I could return it for 30 days if it didn't work correctly. I was concerned about the ability to turn over the motor and was planning on going to the next size up if I needed to. Didn't need to.
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