Need to replace an airhead lead acid battery - BMW Luxury Touring Community
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post #1 of 8 Old Nov 9th, 2014, 4:45 pm Thread Starter
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Need to replace an airhead lead acid battery

I recently added a '76 R90/6 to the garage. It has not run for a couple of years, and the old lead acid battery is shot. Can I simply replace the lead acid battery with an AGM one? Could this cause any problems?
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post #2 of 8 Old Nov 9th, 2014, 5:13 pm
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Re: Need to replace an airhead lead acid battery

As long as the dimensions are the same, the bike doesn't care where the volts come from. I replaced the lead acid battery with an AGM in my '76 Kawasaki a couple of years ago, and wish I'd done it sooner.

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post #3 of 8 Old Nov 9th, 2014, 5:20 pm
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Re: Need to replace an airhead lead acid battery

Just make sure it is properly rated in the AH department. And say good by to puking batteries.

Cool bike BTW !

Pete Murray
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post #4 of 8 Old Nov 9th, 2014, 5:54 pm Thread Starter
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Re: Need to replace an airhead lead acid battery

Thanks gentlemen. I didn't think that it would be a problem, but I thought I'd ask just to be sure.
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post #5 of 8 Old Nov 10th, 2014, 4:17 pm
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Re: Need to replace an airhead lead acid battery

The airhead BMW charging system is not the best. An AGM battery needs a bit more oooomph to fully charge it than does a lead acid battery. I have an AGM in my 1983 R80S, and the bike does not fully charge it. If I use an external "smart charger" rated for AGM batteries before taking a ride, all is well. A BMW master service tech, with many years of /5 experience, told me this.
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post #6 of 8 Old Nov 11th, 2014, 10:33 am
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Re: Need to replace an airhead lead acid battery

Go with an Odyssey battery and try to find a Batteries Plus Bulbs to buy it. Avoid BMW brand as they are crap and OVER priced. I have nearly three years on an Odyssey using a mini Battery Tender brand charger that only runs two hours per day on a lamp timer.

My electric clock kills the battery in two weeks wo the trickle.

All the above is based on experience and not BS opinion.....

Jim

Woodbridge, CA
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post #7 of 8 Old Dec 5th, 2014, 10:34 pm
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Re: Need to replace an airhead lead acid battery

Here is an example that can be had over the web. You fill it with the enclosed acid and follow the instructions for start up. Good price and will work just fine. The following is just an example. Find your size and order up a Yuasa AGM and don't look back.
YTX14-BS | Motocross 12 Volt Replacement Motorcycle Battery from Yuasa
Absorbent Glass Mat (AGM) Battery Information - Battery University
The charge and float voltages are indeed different but every so small. You should always have a motorcycle smart charger on your bike when not riding it.

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post #8 of 8 Old Dec 5th, 2014, 11:35 pm
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Re: Need to replace an airhead lead acid battery

A Yuasa VRLA (valve regulated lead acid) battery would be a good choice as well. It's the type of battery that comes in most new applications. The AGMs are top of the line, but for your application, I would go with the VRLA. That's what I installed in my 1983 Honda Magna. I've been very pleased with it. The best thing is that they are shipped dry. Add the acid, set the sealer caps, and you're done with a guaranteed brand new battery.


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