18650 7v Battery

18650 7v Battery
Are ALL 18650 batteries rechargeable?

I've recently got myself a very nice 50mw green laser - however it's been starting to dim and flicker quite a bit. I measured the battery (18650) it came with, which is meant to be 3.7V, and it is in fact 2.9V! So basically, I'm hoping it's the battery that is causing the beam to dim - but I need to know if the battery I have is rechargeable.
It's in a plain blue plastic casing, and says "Tian Lin 18650 2800mAh 3.7V" - any experience with these batteries - or 2 CR123 batteries together would be very much appreciated!

Thanks.

No, not all of them are. I have some that are and some that aren't. Neither of them say so on the label (I tell them apart by color), so it's possible yours are rechargeable but I doubt that they would come with the laser.

If you want to buy some rechargeable ones and a charger, these are the ones I have (from that site, too):
http://www.dealextreme.com/details.dx/sku.19770
http://www.dealextreme.com/details.dx/sku.6105

DealExtreme SKU 20392 TrustFire Protected 18650 3 7V True 2400mAh Rechargeable Lithium Batteries 2 Pack

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ThorFire 3000mah 3.7V 18650 Battery Protected Rechargeable Li-ion Battery for Flashlight
ThorFire 3000mah 3.7V 18650 Battery Protected Rechargeable Li-ion Battery for Flashlight
$10.99
Specification:
Brand:ThorFire
Battery Size:18650
Battery type:Li-ion rechargeable battery
Voltage:3.7V
Capacity:3000mAh
Net Weight:45g/1pcs
Diameter:18mm
Length:65mm
No memory Effect
Rechargeable times: Up to 500 times
Provides excellent continuous power sources to your device(For led flashlight/notebook/camera/camcorder/PDA etc.)

High Safety
Built-in PCB protection board...

2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
$5.44
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Outlite 2 PCS 3.7V 18650 3600mAh Protected Lithium Li-ion Rechargeable Battery for LED Light& Headlight& Headlamp& Handheld Flashlight& Torch with 1PCS Quick Smart Charger
Outlite 2 PCS 3.7V 18650 3600mAh Protected Lithium Li-ion Rechargeable Battery for LED Light& Headlight& Headlamp& Handheld Flashlight& Torch with 1PCS Quick Smart Charger
$15.99
Indicator light lets you know when charging is complete.

Designed to charge your batteries quickly and safely.
1) Input Voltage: 110-240V, 47-63Hz
2) Output: 4.2V 3600mA
3) Charges 1 or 2 batteries simultaneously
4) Dimensions: 3.34 in x 1.85 in x 1.49 in
5) Weight: 2.46 oz.
6) Li-Ion Rechargeable 18650 with IC Protection.
7) Capacity: 3600mAh.
8) Over-Charging / Draining at 4.2v / 2,...

Canwelum Powerful 18650 Lithium Ion Battery, 3.7V 18650 Rechargeable Battery, 18650 Li-ion Battery with Protective Board and Bigger Power Capacity
Canwelum Powerful 18650 Lithium Ion Battery, 3.7V 18650 Rechargeable Battery, 18650 Li-ion Battery with Protective Board and Bigger Power Capacity

CAN-LI-18650...

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2pcs Vafru INR 18650 2500mAh 3.7v Rechargeable Batteries And Charger. Sealed in box.
2pcs Vafru INR 18650 2500mAh 3.7v Rechargeable Batteries And Charger. Sealed in box.
$15.95
1.High capacity: the capacity approximately 2500mAh, 15% higher than common rechargeable batteries.
2.Versatile battery: compatible with most brands of 18650 flashlights and various kinds of high-drain devices.
3.Purpose-designed high-performance protected circuit: automatically protects against overcharge,over discharge and short-circuiting.
4.Low cost and encironmentally-friendly lifestyle: a...
4pcs Ultrafire 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1pcs Charger
4pcs Ultrafire 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1pcs Charger
$5.00
Features:
1.New battery
2.High quality and durable
3.Provides excellent continuous power sources to your device
4.High energy density, long life battery
5.This battery has an extra long life for all your battery powered devices

Specifications:
1. Battery Type:18650 battery
2. Voltage: 3.7v
3. Capacity: 3000mAh
4. Charge Time: about 6~8hours
5. Rechargeable Times: about 500~700
6. Material: Li-io...


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