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Old 02-08-2015, 07:48 PM   #1
governmentjack OP
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Charging new battery

I bought a new battery for my xr650. I have a charger that charges at 2 amps and 10amps. Bought it because it said you could use it on atvs, lawn mower, motorcycle, etc. Can I use this to charge my new battery? Went with a tusk one that you add the acid.
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Old 02-09-2015, 06:24 PM   #2
governmentjack OP
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For all those following this thread it seemed to work
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Old 02-10-2015, 12:13 PM   #3
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Amperage shouldn't matter as long as the voltage is right - 12vdc.

I bought a new Yuasa OEM replacement battery for my Aprilia a while back. It was the style where you had to add the acid yourself. Pretty foolproof way to activate the battery and keeps the shelf life really well until activated.

I simply charged on my battery tender jr. Took several hours, but once it was fully charged I was good to go. No issues since!
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Old 02-10-2015, 05:12 PM   #4
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Amperage does matter, especially if that charge is not an automatic charger.

Read the charging instructions that came with the battery........it is likely to say something like.....if the battery is a 10 amp hour.............with your charger you would use the 2 amp setting for 5 hours. After that it is fulling charged. 10 amps charging for a cycle battery is too much too fast. If you had to do that it would be a quick charge only. Heat during charging it NOT good.
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Old 02-10-2015, 05:23 PM   #5
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Quote:
Originally Posted by showkey View Post
Amperage does matter, especially if that charge is not an automatic charger.

Read the charging instructions that came with the battery........it is likely to say something like.....if the battery is a 10 amp hour.............with your charger you would use the 2 amp setting for 5 hours. After that it is fulling charged. 10 amps charging for a cycle battery is too much too fast. If you had to do that it would be a quick charge only. Heat during charging it NOT good.
+1, using too big a charger can cook a battery...FWIW Yuasa batteries generally have recommended slow and fast charge amperages on the top of the case like below.

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Old 02-11-2015, 05:37 AM   #6
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Rule of thumb I use is charge at no more than 10% of Battery capacity.
Most of my chargers are smart chargers anyway so its really not that big an issue for me.
Optimate Gen 1 and a Procharger XL so they both stay hooked up to the bike batteries full time when I am not riding.
For the batteries with the acid pack, its worth vibrating them a bit to make sure all the bubbles comes off the plates.
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Old 02-11-2015, 06:36 AM   #7
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Fill with acid and let sit overnight. (acid needs to soak into the plates)
Failure to do this will reduce battery life.
Check level and charge slowly. 2 amp is OK but 1 amp is better.

Batteries should never exceed 125 Deg. F while charging.
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Old 02-11-2015, 02:35 PM   #8
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first, follow the manufacturer's directions

I agree on the 10% max charge rate

the way the charger increases the amperage to a battery is by increasing the voltage. the greater the difference in voltage between the battery and charger, the higher the current will be. you can test this with a voltmeter as you switch between charging rates
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Old 02-14-2015, 09:51 AM   #9
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+1 on letting the acid soak into the plates, 2 hours is a minimum, 6 is better

If you just acid and start the bike,, then head out on the road you lose about 1/3 your battery. Folks have been doing this and getting good results for years and will be still getting good results 20 years from now.

2 hour soak and a few hour charge at a low rate and you will get 90% of perfect. Way more than good enough.

Unless you folks have a voltage and current limited lab type power supply you will not do much better. That is more than enough for all but the perfectionists. It is not rocket science.

Go out and ride.


Rod
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Old 02-14-2015, 02:17 PM   #10
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Originally Posted by ragtoplvr View Post

Unless you folks have a voltage and current limited lab type power supply you will not do much better. That is more than enough for all but the perfectionists. It is not rocket science.

Go out and ride.


Rod
Any decent smart charger will do exactly what is needed to get the 100% perfect charge automatically.
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Old 02-14-2015, 03:48 PM   #11
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Quote:
Originally Posted by showkey View Post
Any decent smart charger will do exactly what is needed to get the 100% perfect charge automatically.

Smart chargers presoak plates?
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Old 02-14-2015, 06:42 PM   #12
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No a smart charger will not. Once they peak at 14.8 or so they cut back to 13.something. A dry charged battery cell is not yet fully formed. You have to hold at 14.8 to 15.1 (in this weather) for a hour or longer to let the plates finish forming.

But again, you will be hard pressed to tell the difference between 80% and 100% using a sample size of one on a bike you ride and the smart charger will get you maybe 90% of maximum.


Rod
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Old 02-15-2015, 01:11 PM   #13
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It really depends on how smart the charger is......on the voltage cut off. There are many different charging profiles that can be chosen as show :

http://www.ctek.com/Archive/ProductM...S%205.0_EN.pdf

Yes....smart or dumb charging has nothing to do with presoaking.....so presoaking is needed.
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showkey screwed with this post 02-15-2015 at 01:17 PM
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Old 03-06-2015, 06:49 PM   #14
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Began working with batteries 30 years ago in the service and find them a blessing and a curse. "Portable power that is a simultaneous pain in the arse." Life is filled with paradoxes.

Keeping my motorcycle batteries on a tender has gotten me an average of 5 years on the batteries that came new in the bikes. The best I ever got was 7 years on the battery that came in the DR650.

Most new batteries have a shelf-charge from the factory that is months old so I always "top off" a new battery before installing it in a vehicle of any description. At the moment I have a new AGM type battery for my wife's Z3 on the Optimate 4+. I'll install it tomorrow after it is fully charged.

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Old 03-07-2015, 10:04 AM   #15
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Me thinks the OP needs to spend 15 + on a new (smart) charger.
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