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New Battery #784444 09/16/19 7:42 am
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dave jones Offline OP
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I thought I would put a meter across my battery after charging it. It showed 10.3 volts and even the led pilot bulb had trouble lighting up. It usually starts first kick but had been taking three or four sometimes recently. Seems to run ok but I think I had better get a new battery!

Anyway, are the Exide AGM batteries ok? My old one is wet and lasted a few years but I don't want another one. Mottobatt seem to be more expensive but are they better?

Dave

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Re: New Battery [Re: dave jones] #784446 09/16/19 7:52 am
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R Moulding Online Content
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Couldn't say if they are better but my oldest Motobatt must be over 5 years and going strong.

Rod


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How amazingly unlikely is your birth;
And pray that there's intelligent life somewhere out in space,
'Cause there's bugger all down here on Earth!
Re: New Battery [Re: dave jones] #784531 09/17/19 1:56 am
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The latest battery on my A65 is a Motobatt 11AH AGM, and it's performing quite well. They seem to be the only 11AH battery that fits my bike, whereas in other brands, the largest battery that will fit is 7AH. For what it's worth, Motobatt is the "official battery of AMA racing" (says it right on the battery).

I'm of the opinion however that AGM batteries do not do well with zener diode regulators. I have only anecdotal evidence to back this up, but it seems that AGM batteries are more dependent on a well-regulated charging voltage than are wet lead-acid batteries.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: New Battery [Re: dave jones] #784540 09/17/19 3:18 am
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desco Online Happy
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https://www.batterystuff.com/powersports-batteries/sYT9A.html
If you don't have an electric start this is all you need. I have these in both bikes and along with a battery tender on each I have lost track of how long they last. They are 1/4" shorter than stock.

Last edited by desco; 09/17/19 3:19 am. Reason: addition

1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: New Battery [Re: dave jones] #784553 09/17/19 7:32 am
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dave jones Offline OP
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Thanks to Rod, MarkZ and Desco for the replies.

I have a Zener diode system. I had not read before that this could damage an AGM battery so this is a worry. How does the Zener differ from the modern system as regards regulation?

Dave

Last edited by dave jones; 09/17/19 7:34 am.
Re: New Battery [Re: dave jones] #784559 09/17/19 8:02 am
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It has a wider max voltage tolerance, so some will be ok others will not.

Re: New Battery [Re: dave jones] #784589 09/17/19 2:57 pm
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wildbill Offline
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I have had Motobatt batteries in my 1967 and 1965 for years. No problem with either. The 1967 T120R has a Pazon with a rectifier and zener diode and is a one kick starter after a priming kick with the ignition off.

Re: New Battery [Re: dave jones] #784592 09/17/19 4:38 pm
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dave jones Offline OP
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Thanks Kommando and wildbill.

I am going to test the charging voltage this week but wildbill gives me some confidence with his Zener equipped bike.

Dave

Re: New Battery [Re: dave jones] #784595 09/17/19 4:54 pm
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Hi Dave, I've been using MotoBatt for 7 years. John has years on his, still good. Many (most) of my riding friends use MotoBatt as well. Most have the original rectifier, Zener. I have original rectifier, zerner. I can say positively without question this battery (MB9U) works perfectly with old systems. It also works perfectly with Podtronics.

If this battery is not working in an original bike, the charging system is at fault, not the battery.

I find it holds its charge a long time without use with no battery tender. 2-3 months no problem at all.

I find its capacity in extended city riding to be very good & it recovers quickly when you get to open road.

It has 4 recessed terminals so you can orient battery wires anyway that works best for your bike.

There is no down side to this battery. It is worth the $$. Plus they never leak acid.

Always test voltage & charge if needed before use. Normal battery charger works good for charging. For battery tender AMG specific is needed.

In USA I always buy direct from MotoBatt. They ship it US mail in a padded box. I don't know what you have in UK. In reviews Amazon sellers sometimes (often??) sell aged or counterfeit batteries.
Don


1973 Tiger 750
Re: New Battery [Re: dave jones] #784610 09/17/19 6:17 pm
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dave jones Offline OP
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Thanks, Don.

Dave

Re: New Battery [Re: dave jones] #784612 09/17/19 6:30 pm
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Just to agree with everyone else who has recommended Motobatt batteries - the one I bought in early 2012 for my TR7 is still as good as new, and that's after several winters with 3 months between even looking at the bike, let alone thinking about putting the battery on charge!


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Re: New Battery [Re: dave jones] #784619 09/17/19 7:41 pm
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My Motobatt was as dead as a doornail after 2-3 years of occasional use. Wouldn't take a charge at all.
I tried to contact Motobatt about this, and the website had an address in Singapore or somewhere daft like that as the UK or European agent.

Went back to a bog-standard opaque white lead/acid battery, which does the job perfectly well.
Still on points, so no 'low voltage' sulks to contend with. On the other hand, I don't have much to add to the permanent rolling-basis "I've just fitted [insert electronic ignition brand here] and now my bike [does 'this'/won't do 'that']" threads.

Nick


"1967 TR6R"
Re: New Battery [Re: dave jones] #784621 09/17/19 8:00 pm
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dave jones Offline OP
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Thanks to Tiger and Nick.

I am still on points so the battery isn't too important but it will get to a stage where it will begin drawing too much current when it is completely knackered and then the bike won't start at all. This is what happened at the end of the last battery although I did get it going again eventually and got home.

Dave

Re: New Battery [Re: dave jones] #784625 09/17/19 9:01 pm
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Dave Lid Offline
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Originally Posted by dave jones
. Mottobatt seem to be more expensive but are they better?

Dave


Hi Dave
Been using Motobatt on all my bikes for a number of years,loads more cranking power and like the rest of the guys state they appear to hold charge for 3-4 months.
Just a little tip though !!!! try not to let the battery fall below 25% of full charge or they will be knackered.Not for the purist though being bright yellow; but IMO well worth that little extra in cost

Cheers Dave


Always remember there are 3 kinds of people in this world,those that can count & those that can't.
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Re: New Battery [Re: dave jones] #784646 09/18/19 3:15 am
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Based on a couple of the testimonials herein, I'm ready to retract my theory that the zener diode hurts AGM batteries. I did ruin a Scorpion 7AH AGM battery when I still had a zener diode regulator, but there may have been other factors at play. Dmadigan, however, did some testing of zener diodes, and reported some inconsistency from one diode to another. So perhaps not all zeners are created equal?


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: New Battery [Re: dave jones] #784659 09/18/19 7:32 am
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dave jones Offline OP
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Thanks to Dave and Mark.

Dave- I usually try and keep the battery topped up if the bike is out of use so should be ok on that front.

Mark- from what I have read in this thread there is truth in what you said because the Zeners can vary in voltage output as you say whilst the modern regulators are more accurate.

I will test my charging but am thinking that the bad battery might spoil the reading. What do you think?

Re: New Battery [Re: dave jones] #784727 09/18/19 11:26 pm
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Yes Dave, a bad battery can throw off your charging voltage readings.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: New Battery [Re: dave jones] #784865 09/20/19 5:47 pm
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dave jones Offline OP
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I checked my bike diary and my current battery lasted 8 years so not bad for wet.

Dave

Re: New Battery [Re: dave jones] #784895 09/20/19 11:17 pm
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Not bad at all! If you're happy with the wet battery, and you haven't had to jump through hoops to keep the acid in (I always had trouble keeping the dang breather hose on, and on a dry-frame BSA, the battery is right above the chrome chain guard), then go for it.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: New Battery [Re: dave jones] #784900 09/21/19 12:26 am
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desco Online Happy
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I've still got a scar on the right side muffler from the battery hose. Wet batteries? no thanks.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: New Battery [Re: dave jones] #784934 09/21/19 7:53 am
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dave jones Offline OP
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I think the trouble starts if the bike starts over charging them which makes marks on the chrome. I noticed that the electrolyte had suddenly sunk right down and that's why I have been talking about testing the charging system. The other thing is my Optimate battery maintainer which I use sometimes seems to have stopped knowing if the battery is good bad or charged. I know my battery is finished so it should show a red light or at least go into desulphating mode but it just stays on the charge mode for ages and this may have made it lose water.

Last edited by dave jones; 09/21/19 7:54 am.
Re: New Battery [Re: dave jones] #785101 09/22/19 7:50 pm
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"The other thing is my Optimate battery maintainer which I use sometimes seems to have stopped knowing if the battery is good bad or charged."

Huh. The $40. Viking charger I bought at Harbor Freight just last year has started doing that too, and this is with known good batteries. This charger has a digital display, and shows "percent charged", so it's pretty obvious what's going on. It will stay at 80 percent indefinitely, but then if I unplug the charger from the wall and plug it back in, it shows "100%". When the charger was brand new, it would charge all the way to 100% and shut off. I'm very disappointed, to say the least.

Note if you do buy an AGM battery, you will need a charger with an AGM setting.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: New Battery [Re: Mark Z] #785107 09/22/19 8:58 pm
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I use a 1 amp Schumacher motorcycle charger 6/12 volt. Works fine and haven't had any issues. it came from Walmart or one of the chain auto parts stores. It does not have an AGM setting and I have not experienced any problems with my AGMs.


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