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

2Pcs TETC 18650 3.7V 6800mAh Lithium Ion Parallel Battery with dual Charger
2Pcs TETC 18650 3.7V 6800mAh Lithium Ion Parallel Battery with dual Charger

Specification: Protected to avoid over-charged or over-discharged (With PCB Circuit Protection, much longer life time then those non PCB protection, never overcharged,more enviromental protection) Suitable for Flashlight Torch/headlamp/In daily life Ultra-high capacity and premium built quality Capacity: Nominal: 3000mAh, Minimum: 2450 mAh Internal PCB protection prevents under-voltage at 2.5V and...

...

4Pcs 3.7V 18650 3000mah Rechargeable Lithium Battery with Charger
4Pcs 3.7V 18650 3000mah Rechargeable Lithium Battery with Charger

18650 Battery Charger: The AC adapter easily folds out to charge and pack away Charge two batteries one time. Compatible with 18650, 16430, 14500, LIR123A, 10440 Li-ion battries LED indication for Power On / Charging / Full charge AC110v-240v 47-63Hz input (international charger, also can be used worldwide) Does not support car power 18650 3.7V Battery: 18650 3000mAh 3.7V rechargeable li-ion batt...

2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
$4.00
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 laser pointer, Led Flashlights, Headlamps and other electronic pro...
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,...

...

...

12 Pack of 3.7V 5000mAH 18650 Rechargeable Li-ion Battery Yellow
12 Pack of 3.7V 5000mAH 18650 Rechargeable Li-ion Battery Yellow
$18.13
Features:
1. Dimensions: 6.5 x 1.8 cm (L x Dia)
2. Color: Yellow
3. Capacity: 5000mA
4. Voltage: 3.7V
5. Quantity: 12Pcs
6. Type: 18650 Li-ion Battery
7. Fit for camera, watch, calculators and other electronic devices

Package Includes:
12 x Battery...

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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