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

Baihemiya 4x 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1PC Two-slot Travel Charger(Blue)
Baihemiya 4x 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1PC Two-slot Travel Charger(Blue)
$13.99
.Product Description Pattern Name: Charger+Battery 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 6~8h…

baihemiya 4x 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1PCS Two-slot Travel Charger
baihemiya 4x 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1PCS Two-slot Travel Charger
$13.99
Product Description Pattern Name: Charger+Battery 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~…
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 (…

KLARUS RT20 Flashlight USB Rechargeable CREE XM-L2 U2 LED Tactical Flash Light 6 Mode,18650 Battery Included Waterproof Magnetic Fix Free Holder, High Lumen Adjustable Head,IPX-8 AR10 Improved Design
KLARUS RT20 Flashlight USB Rechargeable CREE XM-L2 U2 LED Tactical Flash Light 6 Mode,18650 Battery Included Waterproof Magnetic Fix Free Holder, High Lumen Adjustable Head,IPX-8 AR10 Improved Design
$68.00
Product parameters Utilizes CREE XM-L2 U2 LED. Main light has 4 light modes and 2 flashing modes. Battery: 1*18650 or 2 *CR 123A (Do not use 16340 batteries) Size: 5.67″(length)*0.97″(head)*0.94″(body) Weight: 93g (without battery) Working voltage: 3-6.4V Water proof: IPX-8 for use in adverse weather conditions.High-strength aircraft grade aluminum, Military III hard anodic oxidation for superb du…

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
$13.60
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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