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

10 PCS 3.7v 6000mah 18650 Li-ion Rechargeable Battery for Flashlight
10 PCS 3.7v 6000mah 18650 Li-ion Rechargeable Battery for Flashlight
$16.61
Features: 18650 3.7V Rechargeable Battery 6000mAh Blue Rechareable 3.7 V 18650 6000mAh li-ion Battery 6000mAh 3.7V 18650 rechargeable Battery No memory effect, recharge up to 1000 cycles 100% quality Japanese battery cells 100% Q.C. of every battery Manufactured by Hi-Capacity power products….
LUMINTOP® USB Charging SD MINI Cree XM-L2 U2 LED Max 1000 Lumens Max Beam 210 Meters 7 Modes with Turbo Strobe SOS Aviation Signal WR Tactical Flashlight With Memory +1X 18650 Battery
LUMINTOP® USB Charging SD MINI Cree XM-L2 U2 LED Max 1000 Lumens Max Beam 210 Meters 7 Modes with Turbo Strobe SOS Aviation Signal WR Tactical Flashlight With Memory +1X 18650 Battery
$118.00
Detailed Features: 1) Utilizes CREE XM-L2(U2) LED or CREE XP-L HI LED with 50,000-hour lifetime 2) High strength aerospace aluminum alloy construction with anti-scratching type HAIII military grade hard-anodized finish; Consistent silo integrated structure, to ensure the best heat dissipation 3) Optimized ultra-precise reflector offers a longer beam distance than competing products 4) Double-sid…
Olight M1X Striker 1000 Lumens Cree XM-L2 LED Flashlight Double Switch Tail Switch 18650 Battery Tactical Olight Flashlight
Olight M1X Striker 1000 Lumens Cree XM-L2 LED Flashlight Double Switch Tail Switch 18650 Battery Tactical Olight Flashlight
$59.95

FEATURES

Portable and Aggressive LED Flashlight
Features Dual Switches
Five Brightness Levels from 0.5 to 1000 Lumens and a Strobe Mode
Runs on 2 x CR123A Lithium Batteries or 1 x 18650 Lithium-ion Rechargeable Battery
Equipped with a CREE XM-L2
Ultimate Self-defense Flashlight with an Aggressive Bezel

SPECIFIACATIONS

Turbo: 1000 Lumens/5 mins+550 Lumens/55 mins
High: 350 Lumens…

UltraFire Wf-501b G60 Uv 3w Ultraviolet LED Flashlight Torch
UltraFire Wf-501b G60 Uv 3w Ultraviolet LED Flashlight Torch

WindFire Wf-502b 1 Mode 395-410nm UV-Ultraviolet Led Blacklight Flashlight 18650 Rechargeable Battery UV Ultraviolet Blacklight Flashlight Torch with Features Money Detector, Leak detector and Cat-Dog-Pet Urine Detector
WindFire Wf-502b 1 Mode 395-410nm UV-Ultraviolet Led Blacklight Flashlight 18650 Rechargeable Battery UV Ultraviolet Blacklight Flashlight Torch with Features Money Detector, Leak detector and Cat-Dog-Pet Urine Detector

Specification Brand: WindFire Model: WF-502B 1 Mode Emitter: 3W UV LED Bulb Number: 1 Color BIN: Violet Total Batteries: 1 OutPut (W): 3 Color: Black Material: Aluminum alloy Wave Length(nm):395-410 Switch Location: Tail button switch Service Life: 50,000hrs Special Features: Water resistant Battery Configuration :1 x 18650 rechargeable battery (not included). Working Voltage: 3.6-9V. Dimension (…

RBZONE Full Capacity Rechargeable Durable 2600mAh 3.7V 18650 Lithium Ion Li-ion Battery Cell & Foldable U.S Plug Dual-Slot Travel Battery Charger (2pcs & Charger)
RBZONE Full Capacity Rechargeable Durable 2600mAh 3.7V 18650 Lithium Ion Li-ion Battery Cell & Foldable U.S Plug Dual-Slot Travel Battery Charger (2pcs & Charger)
$12.99
* Brand New, RBZONE 18650 3.7v 2600mAh rechargeable lithium-ion battery cell * Full capacity 2600mAh 3.7v 18650 rechargeable battery applicable for LED Flashlights and Headlamps targeted at longer operating time * Eco-Friendly can be recharged over 500 times. High Energy density, long life battery, provides excellent continuous power source to your device * Powerful 2600mAh capacity, much longer …
Topone 10pcs Powerful Efficient 5800mAh 3 7V Li ion Cell Rechargeable 18650 Battery
Topone 10pcs Powerful Efficient 5800mAh 3 7V Li ion Cell Rechargeable 18650 Battery
$22.50
18650 3.7v Rechargeable Battery: Size: 18mm x 65mm No memory effect Environmentally friendly Battery Type: 18650 Rechargeable Battery Voltage: 3.7v Capacity: 5800mAh Material: Li-ion Battery Rechargeable times: Up to 1800 times WARNING: DO NOT dispose in fire or heat; DO NOT puncture,damage,and disassemble; DO NOT mix fresh batteries with used batteries Package Includes: 10 pcs x 18650…

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