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Old 03-05-2013, 09:44 AM   #1
MaraBiker OP
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Car battery on an airhead

After serving me for 3 years my trusted Banner 28 Ah battery died. So I searched for replacement and only suitable motorcycle battery that I found was Unibat 28 Ah at a price of 106$ and the reviews are not so good. I payed for Banner 60$!!
In a search for another solution I found out that a local guy on his RT80 was using a car battery from Daewoo Matiz that costs around 60$ with 2 year warranty. Dimensions fit the battery holder, and just battery terminals must be adopted with leads.

As this car battery is 35Ah, is there any danger for the alternator? If I understand alternator operation correctly there is no danger only it will take longer to charge the battery.
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Old 03-05-2013, 10:33 AM   #2
Paul_Rochdale
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This may or may not help you but using a small car battery is often done here in the UK. You don't say what bike you have but I once fitted a battery intended for a Reliant Robin three-wheeler to my BMW R100/7. The closeness of the top tubes of the rear subframe meant that the top edges of the battery had to be relieved by 2mm each side (using a Surform tool). Not as scary as it sounds. The bike happily like this for years but it was a tight fit.
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Old 03-05-2013, 11:01 AM   #3
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Quote:
Originally Posted by Paul_Rochdale View Post
This may or may not help you but using a small car battery is often done here in the UK. You don't say what bike you have but I once fitted a battery intended for a Reliant Robin three-wheeler to my BMW R100/7. The closeness of the top tubes of the rear subframe meant that the top edges of the battery had to be relieved by 2mm each side (using a Surform tool). Not as scary as it sounds. The bike happily like this for years but it was a tight fit.
Car batteries are a lot cheaper and with longer warranties. It's seems logical to use them.
The bike is R60/7. The size of the car battery is 187 mm x 127 mm x 227 mm. I'll go to garage to see will the size be an issue. Manchester - Real is playing tonight so I must be quick.
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Old 03-05-2013, 07:36 PM   #4
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12v is 12v. Your alternator doesnt care if your battery is 2Ah or 200. As long as it fits, it doesnt matter on whit. Quality of batteries may be an issue down the road, but 12v is 12 and as long as you can fit the battery on the bike in some way, and get some wires bolted to it however, its go.
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Old 03-05-2013, 07:38 PM   #5
bgoodsoil
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They work fine but it can make the bike hard to pick up.

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Old 03-13-2013, 04:37 AM   #6
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Quote:
Originally Posted by MaraBiker View Post
After serving me for 3 years my trusted Banner 28 Ah battery died. So I searched for replacement and only suitable motorcycle battery that I found was Unibat 28 Ah at a price of 106$ and the reviews are not so good. I payed for Banner 60$!!
In a search for another solution I found out that a local guy on his RT80 was using a car battery from Daewoo Matiz that costs around 60$ with 2 year warranty. Dimensions fit the battery holder, and just battery terminals must be adopted with leads.

As this car battery is 35Ah, is there any danger for the alternator? If I understand alternator operation correctly there is no danger only it will take longer to charge the battery.
No problem with the electrics. But be very careful of the ventilation. Those batteries make a lot of fumes. I had fumes eat a hole in my frame after a few years. The car battery didn't have an overflow hose so it would vent down by the road. Coat the frame area with some grease for protection.
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Old 03-13-2013, 06:22 AM   #7
chasbmw
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I remember being told that high AH batteries that still fit into airheads, have their plates closer together and that these can lead to battery failure when subjected to the extra vibration and shocks involved in motorcycle use. So 28 AH batteries might last longer than 32AH.
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Old 03-13-2013, 08:56 AM   #8
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I have made a a cardboard model of Varta battery that I have found. Only way it can fit is by taking of the rear fender and unbolting the rear sub-frame. And still the height can be an issue because of the seat pan. So it will need some expert adjustments.
For now I am not willing to take these steps, and original Banner 30Ah will be available at the end of the month.


187mm 127mm x 227mm.
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