Hi Guys, I have decided my battery is dead after it failed to start my bike for two days in a row, even though it had been on an optimate 4 for 24 hours.

With the ignition off, no optimate, I measured 12.87V
When cranking the bike this dropped to 7.somethingV
About thirty seconds after the failed attempt the battery read 12.05V

=

DEAD!!!!

So I am about to buy a new one, and I hope I don't annoy anyone asking ("Question asked 101 times now! no worries" quoted from Capt from one of the many old threads I searched through lol) which battery am I after?

In a few threads Capt linkd to this one: http://cgi.ebay.co.uk/Yamaha-XT660-R-04-MF-Gel-Battery-CT9B-4_W0QQitemZ140301022401QQcmdZViewItemQQptZUK_Motor cycle_Parts?hash=item140301022401&_trksid=p3286.c0 .m14&_trkparms=72%3A1683|66%3A2|65%3A12|39%3A1|240 %3A1318

which is the CT9B-4,

Whereas in another thread Kev said " Battery type GT9B-4/GS"

The G type is the one my current battery is, also that is the one listed in the Yamaha Parts Catalogue on here.

The C is cheaper and recommended by Capt, just wanted to check I would be ok getting this one instead of the G, I'm guessing it was just a slight revision of the battery and will be A-OK.

Possibly silly question I know, I just don't want to hurt my

Thanks again!

I would think either of the batteries would be fine. I would go for the cheaper one for that reason.

But definately sounds like your battery has had it though.

Thankfully mines still going strong as yet! (where's some wood)

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Mods so far:- Kev Mod/Snorkel Removed/Airbox Drilled/CO2 Upped/Cush Drive Mod/M.T.C. Exhaust/Avon Distanzias:avon: Fitted/NGK Iridium Spark Plug/H4 Bulb Upgrade/White Wheel Trim/Scotoiler/Hand Guards.

your readings were the same as mine when my battery called it a day.I just went with cheap for replacment

Im suprized you didnt try and make 1 lol

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Thanks guys, I went ahead and got the C type, am looking forward to fitting it and going for a ride!

When choosing between battery's, my advice is always buy the battery with the biggest (CCA) Cold Cranking Amps.

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Mods that I have done to my XTX's

My 04 XTX
Stage 1 & 2 DNA filters / Kev fuel mod / snorkel mod / Drilled air box mod / Engine breather mod / Fork Spacer mod / 15w fork oil /
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My 07 XTX
Raptor 700 cylinder 102mm / Modified Crank Case to take a 105mm Raptor Cylinder / 11:1 102mm JE Raptor piston / Stage 1 Raptor Hot Cam / Ported head / Colder Spark Plug / +2mm Throttle body / DNA stage 1 & 2 filters / Modified Air Box / Snorkel removed / Worry Brothers stage 2 filter cover / 6mm & 8mm Bolts Replaced with Titanium Bolts / Recovered seat in Black / O2 Eliminator /

My 09 XTX
59HP at the rear wheel / Stage 2 Raptor Hot Cam / DNA stage 3 Air Box / Carbon Can Exhausts / Modified Exhaust Link Pipes / PCIII With Custom Fuel Map / Wideband Commander O2 Data logger / LCD100 Dyno Jet display & fuel adjuster / 2500 OHM HT lead instead of a 10K OHM XT lead / Extra Coolant Cooler / Protaper Fat Bars / Tail Tidy With LED Tail Light / OKE Protection Knobs / LED indicators / AIS blocked / Modified rear sprocket rubbers / Rear Foot Pegs removed / 09 ECU With 02 Sensor Changed To A 06 ECU / Complete wiring harnes Changed from 09 to 04 / Home made LED resistor flasher / Hole drilled in the fuel tank filler neck to allow quicker filling / Modified Bar End Weights / Progressive front fork springs, 15W fork oil, forks lowered 25mm, used XTR rear links lowering the rear 20mm, rear spring one click stiffer / Changed front & rear guards from blue to black / 47T rear sprocket / Speedo Healer V4.0 / Kev throttle cam mod / Throttle grip mod / The new 2010 O2 sensor mod is out, works a treat, The new 2012 O2 Controller is out, PM me for details

Now ride a 2018 MT09SP ABS + TCS

My KTM 990 SMR Mod book. http://www.ktmsmt.com/viewtopic.php?f=13&t=4946