I should have emphasized, it's the 3 yr 'standard' battery sold by Halfords where I've seen early failures particularly in the Jazz. If they are indeed made by Yuasa, this is even more surprising.
The other 4 or 5yr batteries sold by Halfords are much better though but they don't sell one for the Jazz GD1.
As far as I am aware, in Europe anyway, Varta and Bosch batteries are made by Johnson Controls (Google says JC bought Varta Germany in 2002). I have a Bosch S4018 in my Jazz coming up to 4 years old.
Externally, the S4018 and A14 look the same apart from the label. Both have 4 year warranties, but the Bosch costs a bit more. See attached jpegs. Internally, they 'might' be different but both are suspiciously rated at same 40AH, 330CCA so I suspect they are identical. (The Halfords standard battery is rated at lower 33AH, 270CCA)
Varta A14 spec
40AH, 330CCA
About £40 from most online retailers.
http://www.varta-automotive.com/en-gb/products/automotive/blue-dynamic/540-126-033Bosch S4018 spec
40AH, 330CA
About £50 from most online retailers
url TBA
[attachment deleted by admin]