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~…
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
$21.88
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…
LED Tactical Flashlight, OTYTY Ultra Bright Torch, 1000 Lumens, T6 Water Resistant Torch, 5 Light Modes, Adjustable Focus with 2 Rechargeable 2200mAh 18650 Lithium Ion Batteries and Charger
LED Tactical Flashlight, OTYTY Ultra Bright Torch, 1000 Lumens, T6 Water Resistant Torch, 5 Light Modes, Adjustable Focus with 2 Rechargeable 2200mAh 18650 Lithium Ion Batteries and Charger
$22.99
NOTE: 1. Please charge the battery, if the light is dim, because when you receive the flashlight, the battery may in low power. 2. Our flashlights are ultra bright. Please do not shine them directly into the eyes! 3. Our flashlights are water-resistant, not water-proof. Please do not submerge them in water. 4. Normal charging takes 6-9 hours approx. Flashlight Specifications: 1. Brand: OTYTY 2. B…

Gotd 18650 14500 16430 Li-Ion Battery 100-220V Charger For Rechargeable Batteries
Gotd 18650 14500 16430 Li-Ion Battery 100-220V Charger For Rechargeable Batteries
$2.11
Package Include: 1x Battery charger (without Battery )….
Momoday® Hand-held Mini Fan Mirror fan Ultra-thin Electric-Powered Cooler 3 Speeds Portable Mini USB Summer Fan Rechargeable Pocket Fan Personal fan with 18650 Rechargeable Battery (Black)
Momoday® Hand-held Mini Fan Mirror fan Ultra-thin Electric-Powered Cooler 3 Speeds Portable Mini USB Summer Fan Rechargeable Pocket Fan Personal fan with 18650 Rechargeable Battery (Black)
$16.99
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 ♦ U…

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