Most tackle shops carry both types. The battery powered tip light is simply an
led powered by a watch type battery with a simple on off switch. The tip
light can be whipped to the tip of the rod.
Usually available in either red
or green. Chemical varieties are cheaper but have a limited life. Once
activated, they cannot be turned off. These should be fastened to the tip
with eletricians tape or similar as you will need to change them on a regular
basis. My choice would be the battery powered version.

CR425 USB Battery Charger 2pc rechargeable Batteries for fishing rod tip lights.
£6.99
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CR425 USB Battery Charger 2pcs rechargeable Batteries for fishing rod tip light
£5.99
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2 x MK4 TIP LIGHT FOR NIGHT BEACH FISHING BATTERIES INCLUDED IN ALL COLOURS
£8.35
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Rod Tip Light for Sea Coarse Carp Fishing with CR311 Battery Included x 2
£6.59
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CR425 Battery For Rod Tip Light Sea Freshwater Fishing Float Night -5pcs -UK
£5.90
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X 1 CR435 3V PIN LITHIUM BATTERIES FIT THE BCCT TIP LIGHTS !!
£3.99
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2pcs ROD TIP LED LIGHT for SEA and COARSE Fishing with CR425 Battery Included
£5.99
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1 MK4 TIP LIGHT NIGHT BITE INDICATOR FOR SEA FISHING BEACHCASTER ROD GLOW STICK
£4.45
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CR425 Battery For Rod Tip Light Sea Night Fishing Float -5pcs -UK
£4.90
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