Yamaha SR125 Battery Problem (I think)

[Toby_Smith]

Hi guys,

I have a Yamaha SR125 (T Reg). The bike is electric start.

Last week the battery ran flat (my stupid own fault, left the ignition on for about 3 days!). Was completely dead, didnt even try to turn over or show me any lights on the dials.

Took the bike out on Saturday, managed to bump start it no problem. I then went out for around 2 hours. My assumption being that a decent length ride without having to start the bike mid-journey would get enough charge into the battery for it to start by itself next time.

When I got back. I parked the bike up. Ten mins later I want to move the bike (car park logistics!) and there was nothing. Flat as a pancake. Not even a neutral light. Had to bump it again!

I bought the bike late (mid november I think) last year and straight away replaced the battery and not had any problems with it.

I took the battery out, checked nothing was loose, cleaned up the terminals etc, put the battery back in but still nothing.

I have an optimate so can charge the battery, but if it is not recharging it's only going to end up letting me down! I just find it a bit wierd though, the battery has obviously been charging fine for the last couple of months, the bike gets a decent amount of use, then as soon as the battery runs flat it appears as if it isn't charging.

Any ideas anyone?

Thanks in advance!

[Toby_Smith]

Don't know if this adds anything to the diagnosis, but when the engine is running all the electrics (lights, indicators etc) work fine

[Guest]

give it a full charge with the optimate, you were probably riding with lights on so the charge back won't have been sufficient to charge the battery enough to start

the lights, horn etc all get charge/power from the bike when the engine is running, which is why they all work when so.

the excess is diverted back to the battery as a topup charge.

[Toby_Smith]

give it a full charge with the optimate, you were probably riding with lights on so the charge back won't have been sufficient to charge the battery enough to start

the lights, horn etc all get charge/power from the bike when the engine is running, which is why they all work when so.

the excess is diverted back to the battery as a topup charge.

 

Thanks mate.

I always ride with my lights on so that makes sense.

Cheers for your help mate.

Toby