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

4Pcs Perman 3.7v 5800mAh 18650 Battery Li-ion Rechargeable Battery + Dual Smart Charger US
4Pcs Perman 3.7v 5800mAh 18650 Battery Li-ion Rechargeable Battery + Dual Smart Charger US
$9.49
WARNING: DO NOT dispose in fire or heat; DO NOT mix fresh batteries with used batteries DO NOT puncture,damage,and disassemble; Package Includes: 4pcs x 18650 3.7 Rechargeable Battery 1pcs x Dual Smart 18650 Battery Charger…
SmartLive 4 pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with 18650 battery Charger
SmartLive 4 pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with 18650 battery Charger
$11.99
Battery type:18650 Voltage:3.7V Capacity:5000mAh Material: Li-ion Dimensions: 6.5 cmLength x 2 cm Diameter Charger Input Voltage: 100V~240V 50/60Hz 150mAh Output: DC 4.2V 600mA Suitable for 18650 Li-ion for 2pcs batteries…
4X 5800mAh 18650 Battery 3.7V Rechargeable Li-ion+ 2X Dual Smart Charger
4X 5800mAh 18650 Battery 3.7V Rechargeable Li-ion+ 2X Dual Smart Charger
$22.99
Electronics\Accessories & Supplies\Batteries, Chargers & Accessories\Battery Chargers\4 : Package Includes: 4pcs x 18650 3.7 Rechargeable Battery, 2pcs x Dual Smart 18650 Battery Charger…
Canwelum Rechargeable 3.7V 18650 Lithium Ion Battery, Powerful 18650 Li-ion Battery with IC Protective Board and 3mm Longer than Top Flat Ones - High-power Cree LED Flashlights, Headlamps
Canwelum Rechargeable 3.7V 18650 Lithium Ion Battery, Powerful 18650 Li-ion Battery with IC Protective Board and 3mm Longer than Top Flat Ones – High-power Cree LED Flashlights, Headlamps

CAN-LI-18650…

Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
$12.68
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…
TFSeven® 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
TFSeven® 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
$49.99
•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. * Can be used in Led Flashlights, Headlamps and other electronic products. Battery Specifications: * Cell type: Rechargeable 18650 * Capacity: 4000mAh * Voltage: 3…
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
$3.39
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
$1.00
Color: blue 2 pcs 18650 3000mAh 3.7V Rechargeable Battery + 1x dual Charger….
4 Samsung INR18650-25R 18650 2500mAh 3.7v Rechargeable Flat Top Batteries
4 Samsung INR18650-25R 18650 2500mAh 3.7v Rechargeable Flat Top Batteries
$16.00
1. Nominal discharge capacity : 2500mAh Charge: 1.25A, 4.20V,CCCV 100mA cut-off, Discharge: 0.2C, 2.5V discharge cut-off 2. Nominal voltage: 3.6V 3. Standard charge: CCCV, 1.25A, 4.20 ± 0.05 V, 100mA cut-off 4. Rapid charge: CCCV, 4A, 4.20 ± 0.05 V, 100mA cut-off 5. Charging time: Standard charge : 180min / 100mA cut-off Rapid charge: 60min (at 25 °C) / 100mA cut-off 6. Max. continuous discha…
BT65 Aspire ICR 18650 a6skbj03h6 3.7V LI-ION 1800mAh Flat Top Battery avnndjjstuwiioq ddkhvvuemorostod ou0d43jas9 balustokristo ddaaszer bluumerkto b 18650 3.7V Aspire 18650 rechargeable battery cell is made for high discharge current 573xyz4177 (max
BT65 Aspire ICR 18650 a6skbj03h6 3.7V LI-ION 1800mAh Flat Top Battery avnndjjstuwiioq ddkhvvuemorostod ou0d43jas9 balustokristo ddaaszer bluumerkto b 18650 3.7V Aspire 18650 rechargeable battery cell is made for high discharge current 573xyz4177 (max
$14.55
BT65 Aspire ICR 18650 a6skbj03h6 3.7V LI-ION 1800mAh Flat Top Battery avnndjjstuwiioq ddkhvvuemorostod ou0d43jas9 balustokristo ddaaszer bluumerkto b 18650 3.7V Aspire 18650 rechargeable battery cell is made for high discharge current 573xyz4177 (max…

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