Best mobile wifi router for car.

Hi,

Could you recommend a mobile wifi router (with LTE support) which could be used in car?

I considered Huawei E5573CS-322 but I'm not sure if leaving a device with a bettery inside of a car is a good idea (especially in summer when temperature can be pretty high). Are there any good mobile routers powered via USB/microUSB but without a baterry and with good tolerance for high and low temperatures?

Thanks!