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Li-ion outdoor (-20°C to 50°C) charging : What chip suite best my needs ?

Hello,

I am looking for a chip which handles lithium battery charging the best possible in outdoor conditions (-20°C to 50°C).
The battery will be charged all of the time by a solar panel, even in winter. (0°C-10°C)

It would be great if the chip had Fuel Gauge built in, readable by i2C. 

Thanks in advance,

Julien