Battery life is the #1 question shoppers ask before buying a heated jacket — and for good reason. Nobody wants to be left out in the cold halfway through their day. Here's what you need to know.
Typical Battery Life by Heat Setting
Most heated jackets use a 10,000–20,000 mAh lithium-ion battery pack. Here's what you can expect:
Heat Setting
Estimated Runtime
Low
8–12 hours
Medium
5–8 hours
High
3–5 hours
Actual runtime varies by jacket model, ambient temperature, and usage patterns.
What Affects Battery Life?
Ambient temperature: The colder it is outside, the harder the heating elements work, draining the battery faster.
Number of heating zones active: Running all zones simultaneously uses more power than a single zone.
Heat setting: High heat can cut runtime nearly in half compared to low.
Battery age: Lithium-ion batteries degrade over time — after 2–3 years of regular use, you may notice reduced capacity.
Tips to Maximize Your Battery
Start on a lower heat setting and only increase if needed.
Pre-warm your jacket indoors before heading out.
Store your battery at room temperature — extreme cold reduces capacity temporarily.
Charge fully before long outdoor days.
Can You Replace the Battery?
Yes — Kelvin Coats battery packs are sold separately, so you can carry a spare for all-day warmth or replace an aging pack without buying a new jacket. Browse our Power Packs & Batteries to find the right fit.
Dressing during cold weather months is all about choosing a well-insulated yet stylish winter jacket or coat. Kelvin heated apparel is designed with warmth at the core of each piece of protective gear, excellent for weathering the most intense of the elements in style. For the best Kelvins jacket, we suggest reviewing our measurement guide and sizing recommendation. With our helpful Kelvin sizing chart, you can easily choose the best heated jacket or coat to stay warm this winter.
How Should a Winter Coat Fit?
While everyone will have unique sizing requirements, winter coats should more or less fit the same: loose enough to allow room for layering but tight enough to keep the body well insulated during cold weather. When searching for the “just right” winter coat, choosing the correct size is crucial for guaranteeing the coat or jacket will be effective in fighting against the elements. Accurate sizing ensures that not only does the jacket or coat look nice, but will also provide enough room for mobility for activities outdoors.
Regardless of how you prefer the jacket to fit, by knowing your correct measurements, you can be on the path to choosing the perfect winter coat.
How to Measure Jacket or Coat Size
In order to purchase the best winter coat or jacket, one must gather accurate measurements to get the correct size. Knowing the correct places to gather these measurements plays a huge role in choosing a winter coat that will keep them warm and comfortable at the same time. Especially when choosing jackets and coats that are designed to transfer the maximum amount of warmth, knowing correct measurements is crucial. If you prefer a looser fit to your jackets and coats, make sure to add an inch within your measurements for extra wiggle room.
Before choosing a coat size, make sure to gather measurements from the chest, waist, and hip areas of the body to get a good idea of sizing needs.
Chest/Bust: Measure at the fullest part of the chest, under the underarms, and directly above the shoulder blades.
Waist: Measure around the natural waistline, at the smallest part of the waist directly above the rib cage.
Hips: Measure around the widest part of the hips.
Jacket Size Guide
Women's Sizing Chart
Size
Chest
Waist
Hip
XS
32 - 34 in
81 - 86 cm
25 - 27 in
64 - 69 cm
34 - 36 in
86 - 91 cm
S
34 - 36 in
86 - 91 cm
27 - 29 in
69 - 74 cm
36 - 38 in
91 - 97 cm
M
36 - 38 in
91 - 97 cm
29 - 32 in
74 - 81 cm
38 - 41 in
97 - 104 cm
L
38 - 40 in
97 - 102 cm
32 - 35 in
81 - 89 cm
41 - 44 in
104 - 112 cm
XL
40 - 43 in
102 - 109 cm
35 - 38 in
89 - 97 cm
44- 47 in
112 - 119 cm
XXL
43 - 46 in
109 - 117 cm
38 - 40 in
97 - 102 cm
47- 50 in
119 - 127 cm
Men's Sizing Chart
Size
Chest
Waist
Hip
S
35 - 38 in
89 - 97 cm
29 - 32 in
74 - 81 cm
35 - 37 in
89 - 94 cm
M
38 - 41 in
97 - 104 cm
32 - 35 in
81 - 89 cm
37 - 40 in
94 - 102 cm
L
41 - 45 in
104 - 114 cm
35 - 39 in
89 - 99 cm
40 - 43 in
102 - 109 cm
XL
45 - 49 in
114 - 124 cm
39 - 43 in
99 - 109 cm
43 - 46 in
109 - 117 cm
XXL
49 - 53 in
124 - 135 cm
43 - 47 in
109 - 119 cm
46 - 49 in
117 - 124 cm
Contact Kelvin for Sizing Assistance!
Kelvin’s selection of heated apparel is designed to combine comfort and style effortlessly. With a wide selection of outerwear ranging from layering pieces to heavy winter coats, we trust you’ll find the perfect winter coat at Kelvin. With our helpful winter coat size chart, you’ll be stylishly snuggling up in a Kelvin piece in no time. Explore Kelvin’s full selection of heated jackets today!
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