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How long does your battery hold charge ?

99sh

Tuned and Synch'ed
Joined
Oct 30, 2012
Messages
73
Location
San Jose, CA
I've always have my bike on the tender when not in use but was curious to see how long the battery would last off the charger. In a 7 day span, the battery voltage dropped from full charge to 5V.

Is this normal? I would think we should be able to hold charge for at least a week.

BTW, this is a 2013 V7R
 
Start looking for a parasitic drain. Do this by disconnecting positive of the battery and hooking up an ammeter between the battery and the leads to the fuses and any other circuits. See how much drain you have, then disconnect circuits (easy from the fuse block) until the drain stops. There will be some drain from the ECU, but in the milliamp range. It takes much more than that to drop you down to 5 volts in 7 days.
 
With it being a 2013, it should be a warranty claim. Have the dealer or any good moto or automotive shop do a load test on the battery for you. That's the first step.
 
I did some quick measurements

IGN OFF: 12.7V
IGN ON: 12.43V
Idle: 15.25V @ 1500RPM
Also holds 15.25V flat at any RPM.
Parasitic load: 88.4mA (measured)

I disconnected all the fuses and my accessories, but the 88mA load did not change. If I did my math right, @ 88mA the battery will discharge to half capacity in ~68 minutes.
 
Hi 99sh, I have a 07 Breva 1100 and I just did some checks on my battery, the standby current drain is 3.5mA with a regular jump every 5 seconds up to 5.5mA when the alarm LED illuminates. The current drain with my parking lights on, that is front and tail lights and its 350mA, in the past I have left the parking lights on for at least 5 hrs and the bike still started fine. Its the original battery and now days will go for about 3 weeks untill it needs a charge. Your drain of 88mA seems excessive. Also a fully charged battery would last for many hours on such a low drain, not 68min as you stated.
Kevin
 
You now have some good data to take to your dealer. Your measurements and Kevin's should be provided to them. I agree with Kevin, the 88mA is high.
 
Is there a spec for parasitic drain? I know everyone talks about it, but personally never seen a range of acceptable values.
 
99sh said:
Is there a spec for parasitic drain? I know everyone talks about it, but personally never seen a range of acceptable values.

I'd say Kevin's value is about what it should be. All the ECU needs to do is maintain clock and memory function. If you have an alarm system, it might be higher when turned on.
 
GN OFF: 12.7V
IGN ON: 12.43V
Idle: 15.25V @ 1500RPM
Also holds 15.25V flat at any RPM.
Parasitic load: 88.4mA (measured)

That 15.25V charging rate sounds awfully high. Usually the top charge rate should be just over 14V.
You may have fried the battery with overvoltage/charging
Bare
 
Barenekd said:
GN OFF: 12.7V
IGN ON: 12.43V
Idle: 15.25V @ 1500RPM
Also holds 15.25V flat at any RPM.
Parasitic load: 88.4mA (measured)

That 15.25V charging rate sounds awfully high. Usually the top charge rate should be just over 14V.
You may have fried the battery with overvoltage/charging
Bare

Good point. I overlooked that. About 14.5 should be max charge.
 
I've had my share with bad VRs before on other bikes, but never on a new bike. I only have 160 miles on this damn thing, and maybe taken it out 6 times since purchased new.
 
99sh said:
I've had my share with bad VRs before on other bikes, but never on a new bike. I only have 160 miles on this damn thing, and maybe taken it out 6 times since purchased new.

At least this one is under warranty.
 
99sh said:
I did some quick measurements

IGN OFF: 12.7V
IGN ON: 12.43V
Idle: 15.25V @ 1500RPM
Also holds 15.25V flat at any RPM.
Parasitic load: 88.4mA (measured)

I disconnected all the fuses and my accessories, but the 88mA load did not change. If I did my math right, @ 88mA the battery will discharge to half capacity in ~68 minutes.


That cannot be right. 88mA = 0.088 A X 12 = app 1 watt/hour.
That shouldn't drain a 14 Ah battery in an hour. The drain may be excessive, but no way that can drain a healthy battery that fast.
I'd guess that a load test will show a fault battery.
 
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