Battery YUASA or Deka

Can’t attest for AJC but Yuasa is a quality driven company that is widely used as original equipment. If your usage is not critical or if you trust the recommendation of battery clerk then you can go with the cheaper battery, otherwise I strongly recommend Yuasa

I've always been a fan of Deka batteries, their ETX15 should be the correct battery.

Yuasa YTX14AH-BS is the OEM high capacity battery. I don't think there is a better one you can buy, even spending more money.

Go to Halfords, use their parts search, buy a Yuasa for fifty quid and ride away into the sunset mate.

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My last Yuasa outlived the bike!

Deka aka East Penn is the best battery manufacturer out there. They dont leak as much, they last typically 3-6 years depending on circumstances

Ive been really happy with my yuasa battery, its only stuttered to start once this winter(and unfortunately I dont have a garage here so theyve been outside pets for the time being), and that was after sitting for a week waiting for ice to melt, otherwise riding nearly daily and once a month or so conncting it to my battery tender.

I'm using Deka. But it's a good choice. I haven't any problems with it.

Deka batteries are still good quality. They are somewhat harder to find than other brands.

Fall 2016 Update: I just installed a new battery. It is a Deka Group 47 AGM. Cost was about 135$ at Battery Mart, 20$ more than the standard battery the store offered. It is odd in that the carry handle is square to the battery length. The specs say it weights 37-1/2 lbs. 600 CCA at 0 F. Two minor things: The battery foot flange is not thick enough to match the battery holding channel or the holding clamp. Some sort of wedge needs to be used. There are probably height adapters or spacers sold for that. Second, the hood release cable will need to run on top of the battery corner, unless you slide the battery out toward the radiator more than I want to.

I just upgraded mine a few weeks ago, ended up getting a DEKA AGM 9AGM47 More CCA and far more reserve capacity than the stock battery (120 mins) I was at ~35k miles and my OEM battery was failing fast.. I couldn't leave it in the accessory position without the engine running for more than a minute or two or it would barely be able to crank. The OEM battery is crap as far as I'm concerned