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I have trouble keeping my feet warm while skiing. These batteries coupled with the Hotronics heaters help remedy that. I've only been using these new batteries for a short time, so I could not give them the full 5 stars, only time will tell. The old m4 batteries did not prove that durable. I hope these are an improved model.
Verified purchase: Yes | Condition: New
This is a very durable product. It's light weight and reliable. This is the third season I've been using these batteries here in Alaska. I highly recommend them .
Verified purchase: Yes | Condition: New
Hotronics batteries are good quality and maintain their ability to hold a charge after many cycles
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Have been using Hotronic through 3 generations of their devices.
Verified purchase: Yes | Condition: New