Tesco, you're greedy

Ever wondered why batteries cost a fortune at Tesco? I think Tesco guys are just being extremely greedy as of late.

2x 3V Coin battery: £3.5 @ Tesco
2x 3V Coin battery: 60p @ Amazon

Maybe Duracell battieries last 6 times longer, compared to Panasonics. No, they don't.