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

EGlobalMarket Plastic Battery Holder Storage Box Case Container w/ ON/OFF Switch For 2x18650 Batteries 3. 7V
EGlobalMarket Plastic Battery Holder Storage Box Case Container w/ ON/OFF Switch For 2×18650 Batteries 3. 7V
$8.80
Specifications: 1. Design: serial connection 2. Fit for: 2×18650 3. 7vbattery (not included) 3. Rated voltage: dc 7. 4v 4. Dimension: 8. 8 x 4. 1 x 2. 2cm (l*w*h) 5. Wire length: 16cm 6. Material: plastic 7. Color: black…

Topone 10 3 7V 5800mAh 18650 Li ion Rechargeable Battery for Flashlight from USA Ll
Topone 10 3 7V 5800mAh 18650 Li ion Rechargeable Battery for Flashlight from USA Ll
$16.81
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…
Tactical Flashlight,Hictech 1600 Lumens Brightest CREE XPL LED 6 Modes, Water Resistant LED Flashlight, Outdoor Torch with Rechargeable 18650 Lithium Ion Battery and Charger
Tactical Flashlight,Hictech 1600 Lumens Brightest CREE XPL LED 6 Modes, Water Resistant LED Flashlight, Outdoor Torch with Rechargeable 18650 Lithium Ion Battery and Charger
$39.99
Hictech®- For your better life Features: •Use CREE XPL LED, delivers maximum 1600 lumens output and far-reaching throwing distance is up to 260 meters •Six modes: Moonlight-Low-Mid-High-Turbo and hidden strobe. •Reverse polarity protection, to protect from improper battery installation •Made of 6061 aircraft-grade aluminum, with aluminum alloy orange leather reflective cup. •Premium…
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
$47.96
OLIGHT is A very professional LED flashlight manufacturer in China. Now Olight has handheld flashlights, headlamps,weapon lights, accessories etc. hot sale production lines. Specialty in camping/outdoors, law enforcement/tactical,hunting,every day carry, search and rescue/first responders,self defense. FEATURES Portable and Aggressive LED Flashlight Features Dual Switches Five Brightness Levels…

Topone 10pcs 3 7V 5800mAh 18650 Li ion Rechargeable Powerfull Battery from USA Ll
Topone 10pcs 3 7V 5800mAh 18650 Li ion Rechargeable Powerfull Battery from USA Ll
$17.00
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…

ELEGIANT Portable Fans Mini Fan Mirror fan Ultra-thin Electric-Powered Cooler Hand-held USB Summer Fan Rechargeable Pocket Fan Personal fan with 3 Adjustable Speeds 18650 Rechargeable Battery (Pink)
ELEGIANT Portable Fans Mini Fan Mirror fan Ultra-thin Electric-Powered Cooler Hand-held USB Summer Fan Rechargeable Pocket Fan Personal fan with 3 Adjustable Speeds 18650 Rechargeable Battery (Pink)
$7.99
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: USB or 2X18650 battery(included)
Service time: 10 hours at low speed, 6 hours at medium speed, 2 hours at high speed
Color: Black, blue, green, pink
M…

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