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

10 PCS 3.7v 6000mah 18650 Li-ion Rechargeable Battery for Flashlight
10 PCS 3.7v 6000mah 18650 Li-ion Rechargeable Battery for Flashlight
$16.71
Features: 18650 3.7V Rechargeable Li-ion Battery No memory effect, recharge up to 1000 cycles 100% quality battery cells 100% Q.C. of every battery Manufactured by Hi-Capacity power products. Rechareable 3.7V 18650 up to 6000mAh li-ion Battery High capacity, low impedence, stable characteristics Long cycle life Material: Li-ion Voltage: 3.7v Full Charge voltage 4.2v Nominal Capacity (min.): …
Flashlight T6 LED 1000 lm 3.7-12V 1 Mode Light Torch 18650 powerful Battery Smart charger with Pressure Switch / 45°Side Picatinny Mount Rail Offset Ring Side Mount.
Flashlight T6 LED 1000 lm 3.7-12V 1 Mode Light Torch 18650 powerful Battery Smart charger with Pressure Switch / 45°Side Picatinny Mount Rail Offset Ring Side Mount.
$25.19
100% Brand new , adopting CREE XM-L T6 LED chip. Special reflector design, enhance light output in intension and distance. Fortified glass lens, Aluminum light cup and smooth reflector Provides more concentrated beam throw. Using skidproof design, waterproof . Is an ideal product for outdoor camping and sports. The body of flashlight is built of aircraft-grade aluminum alloy, it has a very solid c…
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
BYB 6w 1000Lumen CREE XML T6 Handheld LED Flashlight, Rechargeable Battery and AC Charger Included, 5 Modes to Use Anywhere with Water Resistance
BYB 6w 1000Lumen CREE XML T6 Handheld LED Flashlight, Rechargeable Battery and AC Charger Included, 5 Modes to Use Anywhere with Water Resistance
$49.99
Item Specifications

LED Type:CREE XM-L T6 LED

Material:High quality aluminum alloy

Lifespan:Approx 100000 Hours

IP Rating:IP-4, Works well in raining day

5 Modes: High / Medium/ Low / Strobe/ SOS

Max output:1000 Lumen

Powered:16850 Battery

Weight (g):125

Color:Black

Charger Specifications
– Input Voltage: AC100V~240V 47-63Hz
– Output Voltage: 5…

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 (…

1000 Lumen Micro-USB Interface Rechargeable Tactical LED Flashlight ORCATORCH T30 6 Modes 3-8.4V XM-L2 U4 Tctical Flaslight Include 1*18650 battery and 1*charger
1000 Lumen Micro-USB Interface Rechargeable Tactical LED Flashlight ORCATORCH T30 6 Modes 3-8.4V XM-L2 U4 Tctical Flaslight Include 1*18650 battery and 1*charger
$59.95
Why choose the ORCATORCH USB charging flashlight LED Flashlight?Product Include:1*T30 flashlight1*18650 battery1*charger1*USB cable2*O-ring1* Holster1* lanyardProduct Parameter: Lamp type: CREE XM-L2 U4 Working voltage: 3-9V Lumens (brightness) and battery life: Turbo(980lumen\ 4h10min)-High(300lumen\ 7h)-Middle(50lumen\ 32h)-Low(1lumen\ 198h)Mode or stalls: Six modes(Turbo-High-Middle-Low-Strobe-…

Welltop® 3 Inches Mini Electrical Portable fan Rechargeable Cute Pocket Bear Fan 3 Speeds 18650 Desktop Summer Cooler Safe Fan Bear Shaped Fan with LED Lights with 18650 Rechargeable Battery and USB Cable (Blue)
Welltop® 3 Inches Mini Electrical Portable fan Rechargeable Cute Pocket Bear Fan 3 Speeds 18650 Desktop Summer Cooler Safe Fan Bear Shaped Fan with LED Lights with 18650 Rechargeable Battery and USB Cable (Blue)
$13.00
More Features: ♥ 3 modes adjustable; High winds and long life have adequate safeguards.
♥ Using the brushless motor industrial grade fans, high winds and long life have adequate safeguards.
♥ International standard 18650 capacity lithium battery provides exceptionally long using time and strong power output.
♥ The integration design, simple appearance, solid structure, it is realiz…

Incoming search terms:

  • 18650 Battery size