BioLite SolarPanel 5+ vs Casio Pro Trek PRG-340

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

Casio Pro Trek PRG-340 is the lighter option — 184 g lighter than the BioLite SolarPanel 5+ (74% less weight). If grams matter to you, that is the one to beat.

Spec	BioLite SolarPanel 5+	Casio Pro Trek PRG-340
Weight	250 g · 0.250 kg · 0.55 lb	66 g · 0.066 kg · 0.15 lb
Brand	BioLite	Casio
Category	Electronics	Electronics

BioLite SolarPanel 5+

250 g

5W solar panel with integrated 2200mAh battery.

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Casio Pro Trek PRG-340

66 g

Solar-powered outdoor watch with triple sensor.

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BioLite SolarPanel 5+ vs Casio Pro Trek PRG-340: which should you buy?

If saving weight is your priority, the Casio Pro Trek PRG-340 wins — at 66 g it is 184 g (74%) lighter than the BioLite SolarPanel 5+ (250 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.

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