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

2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger

2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger...

...

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...

10Pcs UltraFire 18650 4200mAh 3.7V Li-ion Rechargeable Battery for Flashlight
10Pcs UltraFire 18650 4200mAh 3.7V Li-ion Rechargeable Battery for Flashlight
$19.99
10 Pcs Rechargeable Battery Ultrafire 18650 4200mah 3.7v Li-ion Rechargeable Battery for Flashlight Rechargeable Battery Charger #M 69...
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
$10.00
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,...

2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
$1.85
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger...
[Made In Japan] 2Pcs Acatim ICR 18650 Rechargeable batteries with charger in waterproof box , 2500mAh 3.7V
[Made In Japan] 2Pcs Acatim ICR 18650 Rechargeable batteries with charger in waterproof box , 2500mAh 3.7V
$12.96
Pack of 2 18650 batteries sealed in waterproof box.

- Brand: Acatim
- Model: ICR18650
- Size: 18650
- Nominal Capacity: 2500mAh± 50mAh
- Discharge: 20A
- Nominal Voltage: 3.7v
- Positive: Flat
- Protected: No

Warnings:
- Do not overcharge or overdischarge
- Recharge drained batteries immediately
- Do not short circuit
- Do not dispose of in fire
- Do not expose to extreme heat o...

...

18650 Batteries with Dual Channel Charger: 2Pcs 3.7V 18650 3000mah Rechargeable Lithium Batteries (2 Batteries) + Dual Channel Charger + Free Battery Storage Case
18650 Batteries with Dual Channel Charger: 2Pcs 3.7V 18650 3000mah Rechargeable Lithium Batteries (2 Batteries) + Dual Channel Charger + Free Battery Storage Case
$19.99
High Capacity 18650 Rechargeable Li ion Batteries EcoGear FX 18650 3000mAh button top protected rechargeable lithium ion batteries are ideal for use in flashlights, vape products, E-cig products including a subtank and other devices. Batteries also provide much more recharging life cycles than traditional alkaline batteries or cheap UltraFire Batteries. Features and Benefits: • New integrated...
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
$4.80
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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