LT3651 overheating

Hi there,

I'm using LT3651 to charge 8.4V 8300mA Li-ion batteries @4A or 2A

Problem is that the chip is overheating too much, it will be extremely hot!  over 120 °C  

Below is my schematic design and connections.

Even if I reduce the charge current to 2A still it will be heat up too much 

Please help to find the problem.

Thank you.

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