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)
$13.94
.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~…
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…
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 (…

Battery Fan Mini USB Fan 3 Speed Rechargeable Table Fan with 18650 Rechargeable Battery (Blue)
Battery Fan Mini USB Fan 3 Speed Rechargeable Table Fan with 18650 Rechargeable Battery (Blue)
$7.99
Description: rechargeable mini fan environmental friendly low power consumption strong wind power solid structure and pressure-resistant powerful functions and simple operation Specifications: Size:160*112*48mm Weight:210g (battery included) Input: DC 5V, 0.5-1A Output: DC 2V-7V Output power: 0.6-4W Battery type: 18650 rechargeable battery Power supply: 18650 battery or USB cable USB cable le…

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