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

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
Specifications:
1. Battery Type:18650 battery
2. Voltage: 3.7v
3. Capacity: 4200mAh
4. Charge Time: about 6~8hours
5. Rechargeable Times: about 500~700
6. Material: Li-ion Battery
7. Weight: 130g
8. Dimensions: 6.5 x 1.7 cm(L x Dia)
Battery charger Input : AC100-240V, 50/60Hz Output : 4.2V-600mA World voltage (US Flip Plug) Charge complete within 2-3hrs Compatible with 18650 batteries…
Intsun® 4pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
Intsun® 4pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
$19.99
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…
Souyos 800 Lumen Ultra Bright Handheld Flashlight LED 5 Mode Flashlight
Souyos 800 Lumen Ultra Bright Handheld Flashlight LED 5 Mode Flashlight

4pcs Ultrafire 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1pcs Charger
4pcs Ultrafire 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1pcs Charger
$6.55
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 6~8hours
5. Rechargeable Times: about 500~700
6. Material: Li-io…

2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
2 x UltraFire 18650 3000mAh 3.7V Rechargeable Battery + Charger
$7.07
Color: blue 2 pcs 18650 3000mAh 3.7V Rechargeable Battery + 1x dual Charger…
Outlite 2 PCS 3.7V 18650 3600mAh Protected Lithium Li-ion Rechargeable Battery for LED Light& Headlight& Headlamp& Handheld Flashlight& Torch with 1PCS Quick Smart Charger
Outlite 2 PCS 3.7V 18650 3600mAh Protected Lithium Li-ion Rechargeable Battery for LED Light& Headlight& Headlamp& Handheld Flashlight& Torch with 1PCS Quick Smart Charger
$15.99
Indicator light lets you know when charging is complete.

Designed to charge your batteries quickly and safely.
1) Input Voltage: 110-240V, 47-63Hz
2) Output: 4.2V 3600mA
3) Charges 1 or 2 batteries simultaneously
4) Dimensions: 3.34 in x 1.85 in x 1.49 in
5) Weight: 2.46 oz.
6) Li-Ion Rechargeable 18650 with IC Protection.
7) Capacity: 3600mAh.
8) Over-Charging / Draining at 4.2v / 2,…

WindFire® S12 2000 Lumen Flashlight 5 Modes Cree T6 U2 XM-L Led Zoomable Camping Rechargeable Torch Flash Light Lamp With Clip + 2pcs 18650 Li-ion Battery 4000mah WindFire 3.7v Batteries + 18650 Dual Charger Set
WindFire® S12 2000 Lumen Flashlight 5 Modes Cree T6 U2 XM-L Led Zoomable Camping Rechargeable Torch Flash Light Lamp With Clip + 2pcs 18650 Li-ion Battery 4000mah WindFire 3.7v Batteries + 18650 Dual Charger Set
$26.99
Specifications:
Function: 2000 lumens CREE XM-L T6 LED Adjustable Focus Flashlight.
Brand: WindFire.
Main Features:
– 100% brand new.
– Provide super bright light beam, brightness can be up to 2000 lumens.
– Made of high quality 6061T aluminum alloy, sturdy and durable enough for long time daily using.
– Lifespan can be up to 100,000 hours, no need to consider replacing the cap.
– …

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