Trickle charger - Page 3 - Triumph Forum: Triumph Rat Motorcycle Forums
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post #21 of 49 (permalink) Old 05-08-2018, 02:45 PM
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Originally Posted by Wire-Wheels View Post
After reading the comments on this thread, I know I'm going to get "rocks thrown my way", but I have 4 battery tenders plugged in in my work shop. One for each one of my bikes. One for my sports car that does not get driven very often. I use the Battery Tender Jr. They only put out 750ma and the charge stops when the battery is fully charged.
Same here. Mine is plugged in for 6 months straight over the winter with the battery in the bike. The Battery Tender is attached to the pigtail that is attached to the bike's battery. I've been doing this for more than a decade for all my previous bikes and cars. Didn't realize it was a bad thing.

At full charge it's only pushing 0.75amps. Once full (12.6V I believe), the charger enters a float/maintenance mode where it maintains the battery at 0.2V higher than what a full battery should be.
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post #22 of 49 (permalink) Old 05-08-2018, 05:00 PM
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For all the hand-wringing about chargers, I could see this if you plugged a car charger onto a motorcycle battery. That would toast it under any circumstance due to the high charge rate. But using a motorcycle trickle charger? Think about it - if it were that dangerous, then what about when the bike is running and charging the battery at a rate significantly above that of the trickle charger? I have used trickle chargers for years with no problem. I _have_ had a battery explode on a bike, but that was while riding it. And it was a Japanese 2-stroke where the battery itself was the voltage regulator.
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post #23 of 49 (permalink) Old 05-08-2018, 06:59 PM
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I have a car charger but it also has a 2 amp setting. I have a pigtail harness permanently connected to the battery and charge the battery while it is in the bike and connected to the bike’s electrical system.

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post #24 of 49 (permalink) Old 05-08-2018, 07:31 PM
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As I said before I don't own a trickle charger but last week I had 4 AA batteries on charge in the house when they suddenly stopped charging as the charger stopped working when all the smoke escaped from it (as we all know, smoke is what makes electrical devices work and once it escapes the device no longer functions)
So I feel fortunate that I stick to my policy of switching it off when leaving the house and only charge batteries when they are supervised.
The rest of you can do what ever takes your fancy.

//ocr
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post #25 of 49 (permalink) Old 05-08-2018, 09:53 PM
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Quote:
Originally Posted by Old Cafe Racer View Post
Why?
They don't need constant charge.
Just checked the Oxford Optimiser 900's on my Bimota DB9 and 1200 R.

They are not under constant charge.

Both are showing 12.9V on the screen and zero Amps.

But if the volts fall below 12.6 it will begin a trickle charge.

Do some homework.

From the instructions:

5. MAINTAIN ( FLOAT CHARGE ):
a. The Oximiser 900 will maintain and optimise the battery indefinitely so long as it
remains connected to the battery.
b. Continual voltage monitoring determines the battery condition and charge rate
requirements.
i. At 14.4Volts the charging is automatically stopped
ii. If the battery voltage drops below 12.6V it will apply the necessary charge rate to
ensure the battery remains in perfect condition. The Oximiser 900 will apply
a gentle charge up-to 200mA/h to ensure the battery is brought up to a full charge.
iii. If the battery remains in optimum condition, the Oximiser 900 will not attempt to
charge the battery, therefore no over-charging can occur.
c. In this mode the battery “on-charge” indicator will not be shown.

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post #26 of 49 (permalink) Old 05-08-2018, 11:04 PM
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Quote:
Originally Posted by Gabriel Syme View Post
I have a car charger but it also has a 2 amp setting. I have a pigtail harness permanently connected to the battery and charge the battery while it is in the bike and connected to the bike’s electrical system.
That is a pretty significant charge for a motorcycle battery. I used to work as a maintenance engineer. We had large battery banks on our emergency equipment. We would only trickle charge then at about 1amp. These are banks of 24volt batteries for emergency generators and diesel fire pumps. If the charge rate on the float charger got set too high, you would start noticing the batteries would start cooking off water. I think the 750ma. rate is more appropriate for a motorcycle battery. Even then it has to be cut off when full charge is reached. ...J.D.
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post #27 of 49 (permalink) Old 05-09-2018, 02:59 AM
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Quote:
Originally Posted by Wire-Wheels View Post
After reading the comments on this thread, I know I'm going to get "rocks thrown my way", but I have 4 battery tenders plugged in in my work shop. One for each one of my bikes. One for my sports car that does not get driven very often. I use the Battery Tender Jr. They only put out 750ma and the charge stops when the battery is fully charged. I have used this arrangement since 2002 when I got my first Triumph. I replaced the oldest charger last year. It finally died after being plugged in for all thse years. The last time I changed a battery, it was 9 years old. I would not recommed doing this with a charger that did not have some kind of charging control like the Battery Tender Jr. does. I just unplug and go. I'm not going to tinker with what has worked for years. ...J.D.
I think you hit the nail on the head the important thing here is "tender" (optimiser) NOT charger!

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post #28 of 49 (permalink) Old 05-09-2018, 05:51 AM
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Quote:
Originally Posted by Wire-Wheels View Post
That is a pretty significant charge for a motorcycle battery. I used to work as a maintenance engineer. We had large battery banks on our emergency equipment. We would only trickle charge then at about 1amp. These are banks of 24volt batteries for emergency generators and diesel fire pumps. If the charge rate on the float charger got set too high, you would start noticing the batteries would start cooking off water. I think the 750ma. rate is more appropriate for a motorcycle battery. Even then it has to be cut off when full charge is reached. ...J.D.


I am not using 24v batteries. From what I have read, 2A is the max charge rate for a standard motorcycle battery. I just charge up my bikes about once every two months.

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post #29 of 49 (permalink) Old 05-09-2018, 10:30 AM
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At 12 volts and 2 amps you are charging at a rate of 24 watts. At 24 volts and 2 amps it would be 48 watts. The issue is not the voltage but the rate of charge compared to the capacity (amp.hr rating of the battery expressed in watts). Your 2 amp charger being used to charge a motorcycle battery works OK. I got the impression you were keeping in on the battery like a battery maintainer. I misunderstood. Sorry. Although your system is 12 volts and the one I used for an example is a 24 volt system, they work in the same way. ...J.D.

Last edited by Wire-Wheels; 05-09-2018 at 10:47 AM.
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post #30 of 49 (permalink) Old 05-09-2018, 01:52 PM
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Hi,

Quote:
Originally Posted by Gabriel Syme View Post
I have a car charger but it also has a 2 amp setting.
Quote:
Originally Posted by Gabriel Syme View Post
From what I have read, 2A is the max charge rate for a standard motorcycle battery.
It depends where you read it. The correct formula is 1/10th of the given battery's Ah rating. So 2A charging a 20 Ah modern-bike battery is fine. Otoh, 2A charging a 7 Ah or 9 Ah battery on a non-electric-start Meriden Triumph would kill the battery in short order.

Hth.

Regards,
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