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

Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
$12.99
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 produc…
Canwelum Rechargeable 3.7V 18650 Lithium Ion Battery, Powerful 18650 Li-ion Battery with IC Protective Board and 3mm Longer than Top Flat Ones - High-power Cree LED Flashlights, Headlamps
Canwelum Rechargeable 3.7V 18650 Lithium Ion Battery, Powerful 18650 Li-ion Battery with IC Protective Board and 3mm Longer than Top Flat Ones – High-power Cree LED Flashlights, Headlamps

CAN-LI-18650…

Rextin 18650 BRC Protected Rechargeable Lithium Battery (Pair) 3.7V 4200mAh+ Double 18650 Lithium Battery Charger
Rextin 18650 BRC Protected Rechargeable Lithium Battery (Pair) 3.7V 4200mAh+ Double 18650 Lithium Battery Charger
$9.99
Reliable & Professional of Rextin® We registered trademark Rextin® in United states ,professional on batteries and chargers,Rextin always persistently providing high quality and services for everyone: 30 Days money back with one year seller warranty Specifications: 1. Battery Type:18650 recharegeable battery 2. Voltage: 3.7v 3. Capacity: 4200mAh 4. Charge Time: about 6~8hours 5. Rechargea…

Yosoo 2pcs Black Plastic Battery Holder Case Box W Wire for 3 X 18650 3.7v-11.1v
Yosoo 2pcs Black Plastic Battery Holder Case Box W Wire for 3 X 18650 3.7v-11.1v
$6.99
3.7v 18650 Battery | Built-in Over Heat & Charge Protection Board | 3400 mAh Li-ion Rechargeable Batteries (2-Pack)
3.7v 18650 Battery | Built-in Over Heat & Charge Protection Board | 3400 mAh Li-ion Rechargeable Batteries (2-Pack)
$23.97
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…

QD 185-TY Portable Charger 18650 Li-on Battery Power Bank External Battery Pack, 3-Port 5V 9V 12V LED Display for Tablets, iPhone, Android Phones and Other DC Devices Max 20W
QD 185-TY Portable Charger 18650 Li-on Battery Power Bank External Battery Pack, 3-Port 5V 9V 12V LED Display for Tablets, iPhone, Android Phones and Other DC Devices Max 20W
$18.99
√ STRONGLY RECOMMEND YOU TO READ FOLLOWING DETAILS ABOUT THE PRODUCT Qidian is a manufacturer only produce replaceable battery power bank which is favorite among DIY users. It is some kind skilled but useful product. You may need to know: ★★★★ Kindly be noted the batteries are NOT included. It ONLY supports flat top 18650 battery which is 65mm long. It has built in overcharge protectio…

Geelyda USB Fan Rechargeable Fan Mini Compact Easy To Carry for the Office , Home , Dorm , Study , Library , Games Room Outdoor Travel , Table Fan (Blue)
Geelyda USB Fan Rechargeable Fan Mini Compact Easy To Carry for the Office , Home , Dorm , Study , Library , Games Room Outdoor Travel , Table Fan (Blue)
$10.66
Geelyda Mini USB Output Electric Fan is designed for both outdoor and indoor use. The rechargeable fan speed can be adjusted among slow, medium, high, so you will be always comfortable with it. Due to its smart design and high energy efficiency, the fan is ideal for travelling, jogging or sun bathing especially in hot summer time. No matter where you choose to use it, you can always stay cool and …

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