Go Back   Team-BHP > BHP India > Motorbikes


Reply
 
Thread Tools Search this Thread
Old 14th July 2016, 15:21   #16
BHPian
 
farhadtarapore's Avatar
 
Join Date: Apr 2008
Location: Mumbai
Posts: 260
Thanked: 126 Times
Default Re: Lesson learnt: When the battery seems to be dead...

Quote:
Originally Posted by naveenroy View Post
OK, I am pretty much at my wit's end again! The battery is completely getting drained on my CBR 250R again. I charge it for Rs.50 and if I don't run the bike for 2 days, the battery dies! That means that the bike is not charging the battery when running. What is the exact part that needs replacement in this case? Is that the stator?
You say that the battery is dying if you DON'T run the bike for 2 days. Seems to suggest a short somewhere. Battery is getting drained/discharged even when bike is not running. Had encountered such an issue in my ZMR. Had got the wiring harness changed from a local mech because the so-called Hero honda service center chaps refused to acknowledge or diagnose the problem.
farhadtarapore is offline   (1) Thanks Reply With Quote
Old 14th July 2016, 15:27   #17
Senior - BHPian
 
ashis89's Avatar
 
Join Date: Aug 2011
Location: Hyderabad
Posts: 1,055
Thanked: 648 Times
Default Re: Lesson learnt: When the battery seems to be dead...

Quote:
Originally Posted by naveenroy View Post
OK, I am pretty much at my wit's end again! The battery is completely getting drained on my CBR 250R again. I charge it for Rs.50 and if I don't run the bike for 2 days, the battery dies! That means that the bike is not charging the battery when running. What is the exact part that needs replacement in this case? Is that the stator?
It's the alternator which charges the battery (somebody correct me if I'm wrong). I would also suggest that please check for leakage current which can discharge a battery if left idle for a few days.

The symptoms:
The bike would run fine if ridden daily or alternate days. This means the battery is getting charged since the starter works even if we use it 10 times a day. Leave it idle for a couple of days and the battery drains. This means current leaks from the battery even when the bike is not running. If such is the case then please check the wiring for cuts/rat bites, etc. I had to part with a perfectly good battery in my P180 because I couldn't diagnose the above. Later when I faced the same problem with the new battery, the wiring was checked and we found the culprit there.
ashis89 is offline   (2) Thanks Reply With Quote
Old 14th July 2016, 19:08   #18
Senior - BHPian
 
naveenroy's Avatar
 
Join Date: May 2009
Location: Now in Bangalore
Posts: 1,301
Thanked: 652 Times
Default Re: Lesson learnt: When the battery seems to be dead...

Quote:
Originally Posted by farhadtarapore View Post
You say that the battery is dying if you DON'T run the bike for 2 days. Seems to suggest a short somewhere.
Thanks! Yup, I am now convinced that there is a problem/short in the wiring. That is probably the most easiest to check.

Quote:
Originally Posted by ashis89 View Post
This means current leaks from the battery even when the bike is not running. If such is the case then please check the wiring for cuts/rat bites, etc. I had to part with a perfectly good battery in my P180 because I couldn't diagnose the above. Later when I faced the same problem with the new battery, the wiring was checked and we found the culprit there.
Thanks! Yes, I am gonna check the wiring first and then move on to the R/R to see if there is a problem. I am hoping that is not the case as the R/R is quite costly for the CBR! Another part that might have gone wrong is when the connector gets fried - fusing the wires and this might be causing the drain. Will get it checked soon.
naveenroy is offline   Reply With Quote
Old 20th February 2017, 00:05   #19
BHPian
 
hothatchaway's Avatar
 
Join Date: Aug 2012
Location: Bangalore
Posts: 465
Thanked: 433 Times
Default Re: Lesson learnt: When the battery seems to be dead...

Quote:
Originally Posted by naveenroy View Post
Thanks! Yup, I am now convinced that there is a problem/short in the wiring. That is probably the most easiest to check.



Thanks! Yes, I am gonna check the wiring first and then move on to the R/R to see if there is a problem. I am hoping that is not the case as the R/R is quite costly for the CBR! Another part that might have gone wrong is when the connector gets fried - fusing the wires and this might be causing the drain. Will get it checked soon.
Hi,
Its been a while since you posted this, but was wondering if you got to the bottom of the issue. I am facing an identical problem with my wife's Activa where a new battery got discharged after just 4 months of installation and keeps failing every two weeks or so even though it is always kickstarted. I am suspecting the RR unit but the lights, horn etc work fine. Lat resort would be the wiring harness.
hothatchaway is offline   Reply With Quote
Old 20th February 2017, 11:37   #20
BHPian
 
farhadtarapore's Avatar
 
Join Date: Apr 2008
Location: Mumbai
Posts: 260
Thanked: 126 Times
Default Re: Lesson learnt: When the battery seems to be dead...

On a side note, I had been to 4 battery shops which flat out REFUSED to "top-up" water in my battery. They all just keep saying "Replace". And this was after just 1 year of buying the bike.
Then I got it fully charged at a battery shop. Since then, I've tried to analyse how I start my bike. The trick (it seems) was to turn the throttle until there was no play left in the cable and then pressing the clutch all the way in and pressing the self-start button. It starts without a problem even after being idle for 2-3 weeks. If you give more throttle, it just keeps cranking and drains out the battery (low batt icon starts flashing).
farhadtarapore is offline   Reply With Quote
Old 20th February 2017, 21:28   #21
Senior - BHPian
 
naveenroy's Avatar
 
Join Date: May 2009
Location: Now in Bangalore
Posts: 1,301
Thanked: 652 Times
Default Re: Lesson learnt: When the battery seems to be dead...

Quote:
Originally Posted by hothatchaway View Post
Hi,
Its been a while since you posted this, but was wondering if you got to the bottom of the issue. I am facing an identical problem with my wife's Activa where a new battery got discharged after just 4 months of installation and keeps failing every two weeks or so even though it is always kickstarted. I am suspecting the RR unit but the lights, horn etc work fine. Lat resort would be the wiring harness.
It did come down to the RR unit because I had tried everything else. Bike has been sold.
naveenroy is offline   (1) Thanks Reply With Quote
Old 21st February 2017, 00:35   #22
BHPian
 
ArizonaJim's Avatar
 
Join Date: Aug 2011
Location: Phoenix, Ariz.
Posts: 981
Thanked: 1,823 Times
Default Re: Lesson learnt: When the battery seems to be dead...

Although this is an oversimplification of what is happening when a motorcycle is started with an electric starter and then the battery is recharged while riding perhaps this will give a feeling of what is happening.

A typical motorcycle electric starter motor can produce around 1 horsepower.
1 horsepower is equal to about 746 watts of electrical power.

If the starter motor runs for 5 seconds while starting the motorcycle it can use 5 X 746 watts = 3,730 watt seconds of power will be consumed.


Although a motorcycle alternator can produce over 100 watts of power, much of this will be used by the lights and the engine so, lets say 70 watts is going to power these necessary things. That leaves about 30 watts available to recharge the battery.
On a 12 volt system, 30 watts of power would be 2.5 amperes of power available to recharge the battery.

A typical motorcycle regulator/rectifier (RR) limits the maximum voltage to around 14.5 volts.
In order for a alternator to charge a 12 volt battery, only the voltage that is higher than 12 volts can actually push power into the battery so, we can say that the voltage actually charging the battery is about 14.5 volts minus 12 volts or, 2.5 volts.

2.5 volts of power X 2.5 amps = 6.25 watts of power going into the battery.

As starting the motorcycle used up 3,730 watt seconds of power, if we divide that by 6.25 watts of recharging power we find that it will take 3,730/6.25 = 596.8 seconds or 9.95 minutes of riding at a speed fast enough to cause the alternator to put out its full power.

At idle speeds and slightly above idle speeds the alternator may only produce enough power to illuminate the headlight and run the engine so the length of time needed to recharge the battery will be far greater.

This is why short trips or riding at low speeds can cause the battery to run down so, keep this in mind when you start and ride your motorcycle.

It is also why buying a low power (less than 2 amp) trickle charger and connecting it to your battery when you are not riding is a good idea.
Just do not use a battery charger that produces over 2 amps of power and make sure it is the type of charger that monitors the battery power and reduces its output as the battery reaches a full charge.
"Battery Tender" is a good brand to buy.

Last edited by ArizonaJim : 21st February 2017 at 00:38.
ArizonaJim is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
190 km/hr..hit the divider..7 somersaults..learnt the lesson of my life Pancham Street Experiences 77 2nd March 2010 14:56
A lesson well learnt on dealer drama-Alto Lxi beejay Indian Car Dealerships 9 28th August 2009 23:37
The Swift seems to have thrashed the Getz . ajmat The Indian Car Scene 22 22nd July 2005 10:51
Clarkson seems to like Mercs again - this times it's the CLS ajmat The International Automotive Scene 5 23rd March 2005 12:00


All times are GMT +5.5. The time now is 21:12.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks