Weight difference to the original capacity = difference

Weight difference to the original capacity = difference

Bundle Star * Quality Battery for Sony NP-FW50 with Info Chip - Intelligent battery system - 100% compatible "latest generation" for Sony ILCE QX1 Alpha 5000 5100 6000 Alpha 7 Cybershot DSC RX10 - Sony NEX-6 NEX-F3 NEX-7 NEX-7B NEX -7C NEX-7K NEX-3 NEX-C3 NEX-3N NEX-5 NEX-5N NEX-5K NEX-5R SLT A55 A33 A35 A37 (Electronics)
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Customer Review

Hello There!
First, I had noticed the considerable weight difference with the original battery:
- Sony: 58g
- Bund Elstar: 40g
-> The Sony battery weighs 45% more.

To estimate the capacity I have had my Sony SLT-A37 filming without interruption:
- Sony: 12068s
- Bund Elstar: 8622s
-> The Sony battery has 40% more capacity.

On the radiograph, I uploaded here is to see that the Sony battery a considerably higher density than the copy, which probably explains the weight and capacity difference.

My conclusion is that it is not worth considering the cost of equipment to save the few euros on the battery.
The Sony battery I'll swap at 60% capacity in any case with a new one.

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