← Gear database

Coros Apex 4 (42mm with silicone strap) vs Flextail Zero Power Bank 10k

Weight and specs compared for 2026 — and which one to choose.

Coros Apex 4 (42mm with silicone strap) is the lighter option — 88 g lighter than the Flextail Zero Power Bank 10k (61% less weight). If grams matter to you, that is the one to beat.
shopping_cart Check today's price on Amazon
Spec Coros Apex 4 (42mm with silicone strap) Flextail Zero Power Bank 10k
Weight 56 g · 0.056 kg · 0.12 lb 144 g · 0.144 kg · 0.32 lb
Brand Coros Flextail
Category Electronics Electronics
Coros Apex 4 (42mm with silicone strap)
56 g

Rugged mountain sports GPS watch with AMOLED display, up to 85hr GPS battery. 56g in 42mm size, available with nylon strap option (lighter at 51g)

Full details →
Flextail Zero Power Bank 10k
144 g

Lightest 10k battery with highest mAh-to-weight ratio on market.

Full details →

HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.

Coros Apex 4 (42mm with silicone strap) vs Flextail Zero Power Bank 10k: which should you buy?

If saving weight is your priority, the Coros Apex 4 (42mm with silicone strap) wins — at 56 g it is 88 g (61%) lighter than the Flextail Zero Power Bank 10k (144 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest electronics page, or browse the full gear weight database.

More electronics comparisons

Coros Apex 4 (42mm with silicone strap) vs Garmin Instinct 3 Solar 45mm Coros Apex 4 (42mm with silicone strap) vs Coros APEX 4 (42mm) Coros Apex 4 (42mm with silicone strap) vs Garmin Xero C1 Pro Chronograph Coros Apex 4 (42mm with silicone strap) vs Garmin Fenix 8 AMOLED 43mm Coros Apex 4 (42mm with silicone strap) vs Polar Grit X Coros Apex 4 (42mm with silicone strap) vs Casio Pro Trek PRG-340