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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> AGM battery problems /cgi-bin/YaBB.pl?num=1341093632 Message started by zippythezip on 06/30/12 at 15:00:31 |
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Title: AGM battery problems Post by zippythezip on 06/30/12 at 15:00:31 This is a battery 2 months old. Purchased new and fully charged. The battery show good life but hardly turns the bike over, lights indicators all look good but not enough power to start unless I charge it. Battery sitting in bike for a week 12.66 volts Turn ignition on (canada lights on too) 9.5v Crank her over 4v jump start from car, Still connected to car idle 13v 2500 rpm 13.5v 5000 rpm 13.7 v removed from car, idle 11.6v 2500 rpm 11.8 5000 rpm 12.5v turn off bike and its dead, back onto car and remove right away. idle 13.5v 2500 rpm 13.9v 5000 rpm 13.7 v seems to be ok, so I ride up the road and back and talk to my friend next door for about 1.5hrs, bike wont start and now sitting at 11.9v. Is this a sign I have a bad battery? its also hard to charge as my automatic charger says its charged. The top says "charge at i.2 amps" is a 2 amp charger too much? Thanks for reading all this stuff :) |
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Title: Re: AGM battery problems Post by rfw2003 on 06/30/12 at 15:15:30 Looking at the voltages your displaying and what's it's dropping to when you try to crank it. It sounds like you have a bad battery. If it drops below 10.5 volts on cranking that's a good indication that it has bad cells. R.F. |
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Title: Re: AGM battery problems Post by 360k+ on 06/30/12 at 16:38:58 Is there any load on the battery with the ignition turned off? If you take the neg terminal off and touch it to the post, you should not see any sparking. |
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Title: Re: AGM battery problems Post by zippythezip on 06/30/12 at 17:47:43 There is no hidden load on the battery, just a pain drive of 1.5 hr each way to go buy one or return it. My near canadian tire dont have the battery and say they will charge me more to size it and sell me one thats a close fit. Cant win. I do have a shoe box full of rechargeable AA batteries maybe I could rig something up in my saddle bags. |
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Title: Re: AGM battery problems Post by 360k+ on 06/30/12 at 20:15:23 A load on the battery with the key off, is a partial short. That would explain why the battery bleeds down in just a short time. Normally, with the key off, there will be no current flow to ANY circuit (i.e., an open). You can measure current flow with an amp meter between a disconnected terminal and the battery post, however, a simple way is to bounce the terminal against the post a few times to see if it sparks (it shouldn't). |
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Title: Re: AGM battery problems Post by justin_o_guy2 on 06/30/12 at 21:11:39 Take a battery cable off & put a test lite in line between cable & & battery. It the lite lites while the key is on your pocket,, youve got an electrical issue. |
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Title: Re: AGM battery problems Post by ZAR on 06/30/12 at 22:42:09 Good advice from all. I also wonder about the 13.7volts at 5000rpm. That almost points to a failing charging system...either regulator or stator. |
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Title: Re: AGM battery problems Post by thumperclone on 06/30/12 at 23:01:39 std charging output 14 - 15.5 vdc @ 5k rpm |
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Title: Re: AGM battery problems Post by zippythezip on 07/01/12 at 06:27:30 I have tried a multimeter in the line to check for battery drain and there is none. To check charge rates does the battery have to be a good fully charged battery? I was wondering if that is why I dont reach 14.5 at 5000rpm? |
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Title: Re: AGM battery problems Post by Routy on 07/01/12 at 07:04:39 A max charging voltage spec will only be seen on a fully charged battery. While charging, as the battery voltage rises, so does the charging system voltage. The amperage does just the opposite. From all you have said, you have a bad battery. And I'm not so sure the charging system is working correct either. But I know that when dealing w/ a bad battery, a charging system can do very weird things. So when you get a known good battery, do check the charging system voltage. It should be at least 13 volts on a near dead battery, and at least 13.8 + on a charged battery. |
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Title: Re: AGM battery problems Post by zippythezip on 07/01/12 at 07:54:49 Thanks guys, now to track down a battery. Even my local wallymart dont have one that fits. close but poistive on wrong side of battery. I charged my battery yesterday and it settled at 12.82 v . I thought well give it one more try. As soon as i turned the key the voltage was dropping like a brick, pressed the starter at 10.5 volts and it went down to 4v and dead. But the thing is new, never had a new battery go this way. One thing about these AGM batteries I noticed was the top says charge at 1.2 amps, I only have a 2 amp charger so would this put the final nail in the coffin? Thanks again guys. |
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Title: Re: AGM battery problems Post by justin_o_guy2 on 07/01/12 at 08:09:09 IDK how old that battery is, but Id take it to a parts house or Wall Mart & have it charged & tested. Its FREE,, |
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Title: Re: AGM battery problems Post by 360k+ on 07/01/12 at 08:09:31 I don't think the charger would cause the failure. The alternator may even charge more than that, depending. I still tend to think there is an excessive drain somewhere with key on or off. Unfortunately, with this kind of problem, the solution at this point starts to become a process of elimination. BTW, I've charged my AGM with a 6 amp charger and it still worked fine. It probably would not be a good idea to leave it on, but to get it started temporarily it's fine. |
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Title: Re: AGM battery problems Post by justin_o_guy2 on 07/01/12 at 08:49:39 & he said I still tend to think there is an excessive drain somewhere with key on or off. which is another reason to take it for a test./ |
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Title: Re: AGM battery problems Post by Routy on 07/01/12 at 10:29:06 I don't figure. If he fully charges the battery, and hits the starter, and it drops to even 9 volts the battery is,......now read my lips,....JUNK ! DUH ??? But I guess a little false hope ain't gonna kill him. |
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Title: Re: AGM battery problems Post by justin_o_guy2 on 07/01/12 at 15:49:51 IDK,, man,, doesnt cost anything,, & how charged is it on that 2 amp deal? I cant see it, IDK,m but Id give it a shot,, |
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Title: Re: AGM battery problems Post by aintright on 07/01/12 at 17:35:44 the proper way to charge an agm battery is too hook it up in series from another batter on a charger. so you hook a charger up to one battery and then hook the agm battery to the one hooked to the charger. at least that's what i was told by optima when i was talking with one of their tech guys. it probably is the battery, only charging up to 12.82 volts and it drops to 10v when he turns the key on? sounds like a battery to me. |
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Title: Re: AGM battery problems Post by justin_o_guy2 on 07/01/12 at 18:08:13 Yep, likely IS the battery,,, but thers a slim chance its something else. If I knew the history of the batteryt, age, # of times discharged, etc, I mite condemn it outright, but, is it possible theres a big draw somewhere knocking it down? Its a free test, hey, itll probably fail.,but if it doesnt get tested & the new one cant handle the job,, then its $$$ out for what? |
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Title: Re: AGM battery problems Post by Routy on 07/01/12 at 18:45:59 2D2522383E252B24384C0 wrote:
If a charger is too large for any battery, this method is a way of lowering the amps to a more tolerable level for the small battery. But in reality, a 2 amp charger is not too big for most any motorcycle battery,....AGM or other. But do connect it in "parallel", NOT SERIES. Connecting it is series will then turn them into a 24v battery, which won't hurt anything, but a 12v charger will charge zero on a 24v battery,......because the 12v charger will think that the battery is already charged :-/ ;D |
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Title: Re: AGM battery problems Post by aintright on 07/01/12 at 21:06:03 whoops, thanks for the clarification on electrical terms. |
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Title: Re: AGM battery problems Post by rfw2003 on 07/01/12 at 21:16:30 1/10th capacity of the battery is the normal charge rate stated by manufacturers for most types of batteries, to give them the best life. This is just a general guideline to keep a safe temp on the battery while charging it. This is why on just about any rechargeable item you get, the stock charging system that comes with it, and also the manual states that it needs 8 to 10 hours to fully charge. Most batteries can easily tolerate charge rates of up 1x their capacity. i.e. if the battery is rated at 12 amp hours it can be charged at a rate of 12 amps and be fully charged in 1 hour. |
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Title: Re: AGM battery problems Post by zippythezip on 07/04/12 at 10:09:53 To complete the story, Got a new battery, could only get a "A2", same battery only vent is on the negative side. So I cut the slot bigger in the battery box near the neg terminal, vented the tube down behind the starter. This one is the old "lead and acid" my first AGM was a complete flop. So the battery will now sit at 12.8v crank 10.6v idle 14.1v 2500 rpm 14.2v Not used to a what seems a very fast start. I must have been unlucky, never had a bad battery before... warning to others......keep battery reciept :-[ |
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Title: Re: AGM battery problems Post by ralfyguy on 07/04/12 at 10:15:06 You just had bad luck with the AGM. That isn't the general rule at all. My AGM is four years old and functions properly like day one. Peronally I will not get a standard lead/acid battery anymore, too much to mess with in the long run. I don't know the brand of mine, I got it at Autozone, and when it goes bad after all these years I take the old one there and get the same one again. I think it was worth it. |
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Title: Re: AGM battery problems Post by High_Plains_Thumpr on 07/04/12 at 19:44:27 23302929202D313C233029590 wrote:
(Quote truncated for brevity) Quote:
You may have a grounding / terminal / connector / wiring problem. I'd first make sure the battery connectors are clean. Then check all connectors and grounds on the bike. Remove, reconnect. This may explain the inconsistencies you are having with the readings. It may be something as simple as a loose ground. You'll have to remove the tank, seat and covers to get at your connectors. I'd unscrew all grounds, clean, retighten. Disconnect connectors, reconnect them. Once the culprit is found should restore your bike to sound electrical operation again. It is possible that the battery is faulty, but I would remove the battery and manually charge it off the bike. (1 amp charger and a full day to charge.) Then test its voltage with a load, such as headlamp. Also check your connections to the starter. If the battery and connectors all check out, you may have a charging circuit problem; bad regulator or alternator or wiring. Also, if you get stuck somewhere and you don't have enough battery to start; find a convenient place to roll the bike. Put it in neutral with ignition off; set both your choke to mid position and fuel selector to prime (if cold), put key in ignition. Roll the bike to a good jogging pace, jump on the bike, quickly switch key on, put it in 2nd or 3rd gear with clutch depressed, pop the clutch while rolling with throttle partly rolled open. After a couple tries, I was able to ride home on a bad battery incapable of starting the bike. YMMV and good luck. :) |
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Title: Re: AGM battery problems Post by Big John on 07/05/12 at 11:10:31 I have had excellent results with the Westco AGM batteries. Had one in my former bike (Gold Wing 1500) and now have one in my Savage and in my wife's Miata. All have been good. |
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