Gloworm batteries use only pre-selected premium Panasonic lithium-ion cells. Panasonic are the world’s leading lithium-ion battery cell manufacturer and their cells are the highest possible quality in terms of energy density, long life and safety. The batteries are rigorously tested for quality and safety before sale.

Gloworm batteries undergo a waterproof sealing process which makes them 100% weatherproof so you can now use your bike light with total confidence whatever the weather.