Just make sure that they get a bit of sunlight to charge them up.

What can you say, they work. Makes it super easy to find spare batteries in your tent/bivvy when your head torch dies. It means you can recycle normal battery packaging before you leave home.

Very good way of packing 6 AAA cells (3 for Petzl head torch, 3 for LED Lenser TT torch). Neat design allows quick inspection, minimises risk of accidental 'bridging' or 'shorting' of cells in your pack. Built-in luminosity is helpful.

Very useful and practical to store my spare battery. Easy to find in the middle of thed night if your need to change your weak battery.

A brilliant design. Easily found batteries for when you're in the Black hole of Calcutta, and your torch goes out. Very strong luminosity from inside a deep, dark rucksack or amongst all your gear when it's strewn across your tent floor.

Simple but effective. It holds batteries well and keeps glowing for ages even after just a little light exposure.

A neat robust method of keeping your spare batteries tidy and easy to find, I will buy more of these.

Ingenious. Easy to find in your pack or in a dark cupboard. Great for field or home.

Very useful item. Recommended.

Good quality product. Does the job. Would have been 5 stars, but knock off 1 star as I think the pictures are misleading. You'll never get that amount of glow unless you leave it in the sun for several hours and then go immediately into a pitch dark room.

Glow in the dark after your torch runs out will save all that fumbling around for new battaries.

Does the job well, keeps batteries together and no chance of shorts or discharge.

Such a simple idea, yet so handy. No more loose batteries in pockets.

All my AAA's in one place and no need for a torch to find them as it glows in the dark. Brilliant!

Sounds a bit gimmicky at first, but actually a massive help in the field when fumbling for spare batteries once your headlights died. Just a nice simple way of keeping your spares in one place. Would buy again.

Excellent for storing batteries safely during transport. Submit it to sunlight, a lamp, flashlight, etc and it REALLY glows brightly in the dark, I was even able to read from a book in a completely dark room.

Built to last. I highly recommend this product.

A tip: Store the used batteries upside down so you know which ones are charged.

Really useful for swapping over your head lamp batteries one handed. You'll now longer be on your hands and knees looking for that lost battery on the ground or in the bottom of your bag.