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…
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)
$27.99
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. These batteries are for Button Top High Drain Devices (NOT FOR VAPE). Specifications: – Brand:ATK – Battery Size: 18650 – Battery type: Li-ion rechargeable battery – Voltage: 3.7V – MAX Capacity: 3500m…
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~…
Klarus XT11GT CREE XPH35 HD E4 LED 2000 Lumens 18650 Tactical Rechargeable Flashlight With 3100mah Battery with SkyBen USB Light and Car Charger and Wall Adaptor
Klarus XT11GT CREE XPH35 HD E4 LED 2000 Lumens 18650 Tactical Rechargeable Flashlight With 3100mah Battery with SkyBen USB Light and Car Charger and Wall Adaptor
$89.95
Features • Newest CREE XHP35 HD E4 LED, 2000 Lumen Max Turbo output,; beam reaches over 316 meters; industry leading performance • Compatible with CR123A and protected 18650 Li-ion batteries, one 3100 mAh high-quality 18650 battery included • Compact and light (Bezel 34.9mm(1.37″) (D), Body 25.4mm(1″)(D), Length 142.6mm(5.59″)), Weight 130g, (4.58oz) w/o battery • Patented Dual Tactical Ta…
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…

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
$1.65
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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