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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ON THE WAY®4PCS UltraFire 3.7V Rechargeable Lithium Battery 18650 4000mah + 1PCS Dual Travel charger for 18650 Battery
ON THE WAY®4PCS UltraFire 3.7V Rechargeable Lithium Battery 18650 4000mah + 1PCS Dual Travel charger for 18650 Battery
$10.88
Battery

Features:
1 Built-in PCB protection board
2 High quality and durable
3 High energy density, long life span
4 Provides excellent continuous power sources to your device

Specifications:
1. Battery Type:18650 battery
2. Voltage: 3.7v 
3. Capacity: 4000mAh
4. Material: Li-ion Battery
5 Charge Time: about 6~8hours
6 Rechargeable Times: about 500~700
7 Dimensio...

...

2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
$7.24
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger...
Outlite 4 PCS 3.7V 18650 3600mAh Rechargeable Protected Lithium Li-ion Battery for LED Light Headlight& Headlamp& Handheld Flashlight& Torch
Outlite 4 PCS 3.7V 18650 3600mAh Rechargeable Protected Lithium Li-ion Battery for LED Light Headlight& Headlamp& Handheld Flashlight& Torch
$15.99
•Features:
* High quality and durable.
* No memory effect ,Environmentally friendly.
* Provides excellent continuous power sources to your device.
* This battery has an extra long life for all your battery powered devices.
* With overcharge / discharge protection function that you can use it without worry.
* Can be used in Led Flashlights, Headlamps and other electronic products.
.Batter...
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
$14.99
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,...

...

2PCS 18650 NCR18650B 3.7V 3400mAh Rechargeable Li-ion Battery Flat Top for Panasonic
2PCS 18650 NCR18650B 3.7V 3400mAh Rechargeable Li-ion Battery Flat Top for Panasonic
$10.20
*Panasonic NCR18650B Super Max 3.7V 3400mAh Rechargeable Li-ion Battery-Green

*Brand Panasonic
*Color Green + black
*Material Lithium
*Quantity 2
*Type Lithium ion
*Model 18650
*Mark Capacity N/A
*Actual Capacity 3400mAh
*Battery Voltage 3.7 V
*Rechargeable Yes
*Rechargeable Times 1000
*PCB Protected Board No
*Application Flashlights and various household electronic products
*Packing...

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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
$4.00
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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