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

ATK 3.7v 18650 Battery | Built-in PCB Protection Board | 3400 mAh Li-ion Rechargeable Batteries (3-Pack)
ATK 3.7v 18650 Battery | Built-in PCB Protection Board | 3400 mAh Li-ion Rechargeable Batteries (3-Pack)
$29.97
The ATK 3.7v 18650 cell is the Best in the Industry. Paired with the Protected Integrated Circuits (PIC) technology and the High for dual protection makes for a Long Lasting and Reliable Power. Specifications: – Brand:ATK – Battery Size: 18650 – Battery type: Li-ion rechargeable battery – Voltage: 3.7V – MAX Capacity: 3500mAh – Net Weight: 1.7oz (48g) – Diameter: 11/16″ (18mm) – Length: 2-11…

10 PCS 3.7v 6000mah 18650 Li-ion Rechargeable Battery for Flashlight
10 PCS 3.7v 6000mah 18650 Li-ion Rechargeable Battery for Flashlight
$16.71
Features: 18650 3.7V Rechargeable Li-ion Battery No memory effect, recharge up to 1000 cycles 100% quality battery cells 100% Q.C. of every battery Manufactured by Hi-Capacity power products. Rechareable 3.7V 18650 up to 6000mAh li-ion Battery High capacity, low impedence, stable characteristics Long cycle life Material: Li-ion Voltage: 3.7v Full Charge voltage 4.2v Nominal Capacity (min.): …
Topone 10x18650 3 7V 5800mAh Li ion Rechargeable Battery for Flashlight from USA
Topone 10×18650 3 7V 5800mAh Li ion Rechargeable Battery for Flashlight from USA
$17.87
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…
1000 LM Micro-USB Rechargeable Tactical LED Flashlight ORCATORCH T30 6 Modes 3-8.4V XM-L2 U4 Tctical Hunting Police Flaslight Include 18650 battery and charger
1000 LM Micro-USB Rechargeable Tactical LED Flashlight ORCATORCH T30 6 Modes 3-8.4V XM-L2 U4 Tctical Hunting Police Flaslight Include 18650 battery and charger
$54.93
Why choose the ORCATORCH USB charging tactical LED FlashlightProduct Include:_1*T30 flashlight_2*18650 battery_1*charger_1*USB cable_2*O-ring_1* Holster_1* lanyardProduct Parameter:_ Lamp type: XM-L2 U4_Working voltage: 3-8.4V _Lumens (brightness) and battery life: Turbo(980lumen\ 3h)-High(300lumen\ 6h)-Middle(50lumen\ 28h)-Low(1lumen\ 198h)_Mode or stalls: Six modes(Turbo-High-Middle-Low-Strobe-S…
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 (…

Topwell Ultra-thin Rechargeable Hand-Held Mini Fan with Li-ion 18650 Rechargeable Battery - Black
Topwell Ultra-thin Rechargeable Hand-Held Mini Fan with Li-ion 18650 Rechargeable Battery – Black
$14.99
Specifications: ♦ Size:9X16X2cm ♦ Weight:210g (battery included) ♦ Input: DC 5V, 0.5-1A  ♦ Output: DC 2V-7V ♦ Output power: 0.6-4W ♦ Battery type: 18650 rechargeable battery, charged by 5V-output charger, like computers, laptops ♦ Power supply: 2X18650 battery(included) ♦ Service time: 10 hours at low speed, 6 hours at medium speed, 2 hours at high speed ♦ Color:blue; …
Battery Fan Mini USB Fan 3 Speed Rechargeable Table Fan with 18650 Rechargeable Battery (Black)
Battery Fan Mini USB Fan 3 Speed Rechargeable Table Fan with 18650 Rechargeable Battery (Black)
$21.99
Description: rechargeable mini fan environmental friendly low power consumption strong wind power solid structure and pressure-resistant powerful functions and simple operation Specifications: Size:160*112*48mm Weight:210g (battery included) Input: DC 5V, 0.5-1A Output: DC 2V-7V Output power: 0.6-4W Battery type: 18650 rechargeable battery Power supply: 18650 battery or USB cable USB cable le…
ETONG Hand-held Mini Fan Portable Electric-Powered Cooler 3 Speeds USB Fan Rechargeable Personal fan with 18650 Rechargeable Battery
ETONG Hand-held Mini Fan Portable Electric-Powered Cooler 3 Speeds USB Fan Rechargeable Personal fan with 18650 Rechargeable Battery
$13.80
Specifications: ♬ Size:9X16X2cm ♬ Weight:210g (2*18650 rechargeable battery included) ♬ Input: DC 5V, 0.5-1A  ♬ Output: DC 2V-7V ♬ Output power: 0.6-4W ♬ Battery type: 18650 rechargeable battery, charged by 5V-output charger, like computers, laptops ♬ Power supply: USB or 18650 battery(2 batteries included) ♬ Service time: 10 hours at low speed, 6 hours at medium speed, 2…


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