Looks can be deceiving,
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This review is from: 7dayshop Rechargeable High Performance Ni-Mh Batteries - AA Size 2900mAh - 16 Pack "4x4" with Protective Storage Case (Electronics)
Looks cheap, it infact is cheap(!) but actually holds a hell of a lot of power and don't leak.
Don't be fooled by the way these batteries look - they are well worth a punt if you need a high capacity rechargeable battery.