battery charger - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 14 (permalink) Old 07-29-2017, 07:01 PM Thread Starter
Senior Member
 
nick57's Avatar
 
Join Date: May 2012
Location: erie pa
Posts: 1,440
battery charger

can a car 12 volt charger be used on a bike. i've been trickle charging a spare battery i have and 24 hours later it's only up to 9 volts.
nick57 is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old 07-29-2017, 07:16 PM
Member
 
Join Date: Apr 2016
Posts: 81
Garage
I use the same charger for my cars and bikes. If it won't take a charge it's probably shot. Most auto parts stores will check batteries for free.
smittyrock is offline  
post #3 of 14 (permalink) Old 07-29-2017, 07:19 PM Thread Starter
Senior Member
 
nick57's Avatar
 
Join Date: May 2012
Location: erie pa
Posts: 1,440
12 volts is 12 volts right.it's a new battery i never installed , been sitting on a shelf for two years, thanks.
nick57 is offline  
Sponsored Links
Advertisement
 
post #4 of 14 (permalink) Old 07-29-2017, 07:19 PM
Senior Member
 
BrokeAss's Avatar
 
Join Date: May 2017
Posts: 139
Quote:
Originally Posted by nick57 View Post
can a car 12 volt charger be used on a bike. i've been trickle charging a spare battery i have and 24 hours later it's only up to 9 volts.
The*rule of thumb is that you should never charge a battery at more than one-tenth its rating in amp hours. Meaning that a 20-amp battery should be charged at no more than 2 amps over a 10-hour period. Overcharging a battery can lead to all sort of problems: The electrolyte may boil, the battery can overheat and buckle the plates and, in extreme cases, the battery may even blow up, especially if excess hydrogen gas is released and thereís a spark handy. Large automotive-type battery chargers, designed to charge a good-sized car or truck battery, can easily overcharge a small motorcycle battery if youíre not careful. Unfortunately, in some circumstances, that may be the only type of charger available. Hereís the solution: Insert a standard test light, or even one built from a taillight bulb, inline between the positive side of the charger and your battery. Typically a test lamp, turn signal or brake light bulb draws about 2.25 amps. (If youíre not sure of the bulbís amperage or wattage, hook an amp meter in series to measure the flow.) If you have something like a 6-amp charger that you want to use on your 20-amp battery, youíll need to connect two bulbs in parallel. Yes, itís a pain, but itís better than cooking your*battery.

(From motorcyclecruiser.cim)

Sent from my SM-G930T using Tapatalk
BrokeAss is offline  
post #5 of 14 (permalink) Old 07-29-2017, 07:41 PM Thread Starter
Senior Member
 
nick57's Avatar
 
Join Date: May 2012
Location: erie pa
Posts: 1,440
my charger is only 1 amp.and the battery is up to 8.65 volts i'll check it in the morning.. I wonder if it would charge faster with the bike running or is there still a danger of overchargering.
nick57 is offline  
post #6 of 14 (permalink) Old 07-29-2017, 08:23 PM
Member
 
Join Date: Apr 2016
Posts: 81
Garage
Will the bike start? Bikes and cars are 12 volts but when charging a battery or starting a vehicle amps are really what's important. I normally try a quick charge first and then I see how the battery responds when connected to the vehicle. Is it a serviceable battery? If so I'd check the electrolyte level.
smittyrock is offline  
post #7 of 14 (permalink) Old 07-29-2017, 08:37 PM Thread Starter
Senior Member
 
nick57's Avatar
 
Join Date: May 2012
Location: erie pa
Posts: 1,440
not serviceable, sat on a shelf for two years hope it's still usable. with the charger hooked up the dash lights are dim and turning the key is no go. with the charger disconnected no lights come on at all. if i go for a ride tomorrow i'll put the old battery back in and the new one on the charger.it must take awhile to fully charge a battery.
nick57 is offline  
post #8 of 14 (permalink) Old 07-29-2017, 08:47 PM
Member
 
Join Date: Apr 2016
Posts: 81
Garage
I've never used one that I knew had sat for that long but I've recharged some batteries over night successfully when my other bike had a short that would drain the battery.
smittyrock is offline  
post #9 of 14 (permalink) Old 07-29-2017, 10:34 PM
KCW
Senior Member
 
Join Date: Sep 2016
Posts: 5,085
Garage
lead acid batteries have one nasty characteristic: when you use them (draw them down) you have to recharge them immediately

and I mean immediately.

That is how they work in a vehicle, you start the engine and take a lot of power out, and the alternator immediately charges the battery back up.

If a battery slowly goes dead over days or weeks, its usually shot after that. This is why you put a trickle charger (keeper) on your MC battery over the winter. Normally a battery will just stay charged for a few months by itself, but if its slowing draining down and you dont keep it charged, the chemistry on the lead plates turns into something else, and the battery will not recover.

Some people say you can put something in there (I dont remember what) and recover the battery after its been dead for a long time, but I dont know if that is true.
KCW is offline  
post #10 of 14 (permalink) Old 07-30-2017, 07:23 AM
Member
 
Join Date: Mar 2017
Posts: 59
Battery tender and a trickle charger not really the same. If thou have only 8 volts on a 12v battery, you either have 2 shorted cells or lots of sulfating. Writhe case the battery is probably toast.
One thing you can try is a battery tender, one that can desulfate by "exercising" the battery. They usually cost around $40-50. The process usually takes a week or so.

Sent from my SM-G930V using Tapatalk
ragtopmg is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome