Don't use Batteries that come with Penlight
348436
Don't use the batteries that come with them.  The battery inside expanded and spilled chemicals inside the light.  Now I have to throw the penlight away because no way am I going to put this over a patient's eyes and risk getting chemicals in patients eyes. I threw away all the other batteries from my other pen lights as a have 4 of these.  The battery is so cheap that it doesn't even say what is in the battery other than there is 0% Mercury Cadmium.  The battery is called Super Lusty?!?!?!

Picture quality isn't very good.  Battery and sitting in a trash bag on the floor so was difficulty keeping focus. But you get the idea.
2800569
I am exhausted with Logitech replacing objects that work great with a double A battery with a recharger system that requires I remember to plug the dang thing in.  They have done the same thing with their TV remotes.  In this case, with my old MX, I could just carry an extra battery in my computer case and always be fine (and they lasted months).  Now, I have to hope I remember to charge the thing, because if I forgot, I am out of luck for the evening because it will not work while plugged in charging.
4567542
I own the 10 million candlepower version of this light and almost every complaint about this light is about charging. These lights use a sealed lead acid battery which MUST be maintained properly. You can't let it sit (even in the Amazon warehouse) for much more than a month without PROPER charging. Leaving the charger plugged in too long will fry the battery and not keeping the charge up about monthly will also ruin the battery. You can't let it sit for months between uses and expect the battery to take a charge especially if you drop or handle the light harshly while discharged (that ruins most lead acid batteries except deep cycle types). My light is years old and worked fine until it was stored for a couple years without charging. I'm replacing the battery now and fully expect it will work just fine.
If you get one of these from Amazon and it won't take a charge check the battery voltage (or have a friend do it) and if it's much below 10 volts after charging you have an old battery and you should demand a refund from Amazon. If they give you the "hazardous material" claim demand a refund anyway or contest the charge on your credit card.
4585192
No batteries,  so I can't  use till I buy some,
Others include  them.
81340
Actually, the 5 stars are for the FLASHLIGHT alone -- I'd give ZERO stars to the WindFire batteries.

I bought two of these WindFire flashlights, on Amazon. They each came with 3 WindFire batteries. On the first night, the flashlights proved to be fabulously bright (Cree bulbs). However, the batteries would not hold a charge for more than a few minutes on "HIGH" beam before the flashlight would begin to flicker, at which point I'd have to go the "MEDIUM" beam. That worked for a few more minutes before flickering started again, at which time I'd have to go to "LOW" beam. Even with this process, the flashlight often failed totally within 10-15 minutes.

Thinking that there was a bad battery in the original set, I ordered 6 more WindFire batteries. Huge (and expensive) mistake. Some of the "new" batteries would not even charge, and those that would charge exhibited the same poor power characteristics as the original batteries. Way to torpedo your own product, WindFire!

I researched 18650 batteries more, and took a chance on the Orbtronic 18650 batteries on Amazon. I have now purchased 9 Orbtronic batteries (two sets in the flashlights and a spare set in a 4-slot charger) and they have worked perfectly for us in the WindFire flashlight. We use the flashlights to walk our small dogs in our yard at night (large yard, coyote territory) for about 10-15 minutes at a time, and the charge in the Orbtronic 18650 batteries lasts for at least a week at that rate (but note, when the charge is gone, it is suddenly gone, hence the need for a spare set). Our two WindFire flashlights no longer flicker or fade after a minute or two, and now brightly illuminate the farthest reaches of our yard.

If you take a chance on this flashlight, get GOOD batteries (from what I've now read, there are apparently a lot of fakes, "re-manufactured", and re-labeled old batteries being sold as new).
4689736
The light works well for what it is.  However I was disappointed to discover that it requires 3 AA batteries.  I was under the impression that it had some kind of internal battery that is rechargeable.  Now I have to go through the arduous task of finding the batteries that will recharge with the given plug.  It's basically a battery powered lamp with the option to plug it in to make it work.  Maybe look for another one.
3105599
The light is super bright but  batteries are junk they clame 4200  milliamps  but there is no such thing in a 18650  battery  The batteries that came with the headlamp are only good for 100 mA I had to go out and buy better batteries.
3590628
Completely useless light that doesn't hold a charge for more than a few minutes after removing it from the charger.  It's clear from other reviews that this is a known issue with the batteries.  Wish I had seen the other reviews before I wasted my money on this thing.
1963234
Directions for inserting battery are not just difficult but completely incorrect. I almost broke the flashlight trying to open it according to the instructions. I finally gave up and just decided to try the standard way of getting to the battery compartment, which of course did work.
It comes with two batteries and a single U shaped battery charger. Use one while charging the other. The light is good for its size, but not really special. Still, you get a lot for your money.
3116942
This product comes with rechargeable batteries.  The keypad seems to hold a charge but the mouse does not.  It's very frustrating.  I would not recommend this product if you plan to use it frequently.
4325951
Quality flashlight but drains battery very fast and that type of battery is expensive, I suggest to buy AA flashlight instead
462077
it is to fragile to have that penlight in my poket

I will keepe it as a tird choice.

I won't recommand it
2148632
I really liked this light for a while, it fit my Ford car socket perfectly, and put out plenty of light for those few times I needed it.
However it recently failed to charge, and the battery pack is not available. There is NO equivalent battery made to replace it with.
These ni-mh rechargable batteries were special order from china, so once they have failed, the light is useless. The 4.8v battery is actually 4, 1.2v special batteries soldered together. So if you want a cute light for a few years its o.k.
731705
Another birthday gift I ordered for my hubby that backfired...the problem with this lamp is the battery department.  We placed all 3 batteries in, screwed the cover on, flipped the switch to ON and tada - nothing!  Checked to make sure the batteries were in right and still nothing.  Then as I was attempting to remove the batteries again, I noticed if the battery was just barely inserted and gently touching the connection it came on.  Once the battery was pushed in completely it went off.  So it only works, occasionally, without the cover and the battery not fully inserted.  Well that's not at all practical so basically this item sucks - don't waste your money.
2773698
The Wormlight sounds good, doesn't it? "You can play your Game Boy Color in the Dark! Isn't that cool!" Yes, my friends, it is cool. That is, if it didn't use your GBA's batteries. No big deal, you say? What would your impression be if a drunk came up to your door and freeloaded off you for the rest of your life? There. Now that we share the same point of view, DO NOT BUY THIS LIGHT. IT WILL DESTROY YOUR BATTERIES' LIFE, AND TRUST ME YOU DON'T WANT THAT.
1308064
The light doesn't work just only the pen. It just doesn't have the option for battery. I'm very sad with this purchase. :(
726539
This type of light (led, portable, rechargable, no cord required, very bright, not too heavy, long lasting beam) sure is convenient.  It is solid and is rated better than similar lights sold on Amazon.  Very pleased.

Even though it turns on bright right out of the box, be sure to charge it for at least 10 hours before you have a serious use for it.

UPDATE June 2013:  I took away 2 stars.  Have you tried replacing the battery in this thing?  Sealed lead acid batteries typically don't last longer than 3 or 4 years.  So unless you consider this a disposable item after that time, you will have to contend with the expensive and difficult chore of replacing the battery.  I accidentally overcharged the battery by using the wrong charger.  I need a new battery and found only one source:  $33 with shipping, 2/3 the price of the unit.  It is difficult to take the unit apart to access and replace the battery.  I imagine it is even more difficult to put it back together.  The instructions say the battery is user replaceable but they make it difficult to do so.  Coleman does not offer replacement batteries.  Finding one is like looking for hen's teeth.