Flat battery

[Nokesy]

Went to start my bike today after not riding for a few months. Despite new battery just before winter really started - nothing!! I have a battery pack charger but last time I used this, rode to Bristol (about 30 miles) and it wouldn't start at the end of the day. Will I need another new battery? Anyone know how best to revive the old one so I don't keep getting stranded? (I knew I should have invested in a trickle charger!

[Scotty]

If it's knackered, it'll be beyond revival I'd say, though it shouldn't be dead after a few months - best get your charging circuit checked, charge the battery, fire up the bike and for a start check the voltage across the battery terminals with the engine running - it should be about 14V. If not, there could be a problem with the alternator (burnt out coil), wiring (burnt wire or plug terminal) or regulator/rectifier unit (that could also cause the 2nd issue) A duff charging circuit would explain why it wouldn't start after your ride to Bristol. See if it's charging first, and if it is, then it's the battery, if not, start looking elsewhere... good luck [smiley=thumbsup.gif]

[Nokesy]

That's really helpful advice - thankyou! Only problem is I don't have a voltage meter - maybe my local garage might help?

[Chappers]

I'm sure they will! They're only a few quid though and really handy for solving annoying wiring / battery problems!

Hope you get it sorted.

[Honda_Star]

I have bought a fair few batteries in my time > Normally have discovered they are flat just as I am about to sell the bike! ;D

[Kevinb]

I had to buy one this week. I looked under the seat saw where the battery was and thought sod that. Pheonix in Trowbridge popped around my house during the day when my wife was in and fitted a new one. Excellent service. I did pay more than I expected. I just went into the shop after work and paid.
Saw a Yamaha T-shirt for my grandson which they knocked pretty much a fiver off to bring it down to £10.

[Roll_on]

I had a flat battery and both dip headlight bulbs had blown so I went to Chippenham Motorcycles and saw Mike and Freddie. Freddie fitted new bulbs for me which is no mean feat with the fairing in place on a Triumph Trophy. Then on to the battery, they unfortunately did not have the right battery in stock so one has been ordered and a loan battery fitted to get me home and allow me to use the bike. That was Wednesday this week and the new battery is now in ready to fit today. Always get great service from CMC I would recommend them.

[jonnydangerous]

nokesy, do you have the receipt? just incase something is wrong with the battery???....most batteries have at least a year guarantee, and sometimes up to three....worth checking.
your brother will have a Volt meter, and i seem to remember he actually went to college on the day that we looked at batteries....hahaha ;-)

[ZZR600Dude]

Get an Optimate they help maintain your battery and keep in topped up especially over the winter months if you dont ride the bike much. I have heard bike alarms can drain the battery if left long enough.
Says on the box that it can recover even difficult batteries.
I have had one a couple of years now and never had a problem with it.

Paul

[Jon_W]

Sounds like the plates have phosphated over.

This happens if a battery is left inactive for long periods.

The only possible answer is to get a trickle charger with an ammeter, put the battery on the minimum current charge setting and leave it for anything up to four weeks. Check the acid levels, current, and temperature throughout.

What should happen if it is this is the current will start off very low and stay like that for a while. Then after a while it will suddenly jump up to around the level you would expect of a flat battery and then go through a normal charge.

Basically you are cleaning corrosion off of the plates and then re-charging the battery. This dosen't always work and can take a long time, but I've rescued batteries this way in the past.