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 3.7V 18650 3000mah Rechargeable Lithium Battery with Charger
4Pcs 3.7V 18650 3000mah Rechargeable Lithium Battery with Charger

18650 Battery Charger: The AC adapter easily folds out to charge and pack away Charge two batteries one time. Compatible with 18650, 16430, 14500, LIR123A, 10440 Li-ion battries LED indication for Power On / Charging / Full charge AC110v-240v 47-63Hz input (international charger, also can be used worldwide) Does not support car power 18650 3.7V Battery: 18650 3000mAh 3.7V rechargeable li-ion batt…

4 pcs Tenergy Li-ion 18650 Cylindrical 3.7V 2600mAh Rechargeable Batteries (Button Top) with PCB for Flashlights and Others
4 pcs Tenergy Li-ion 18650 Cylindrical 3.7V 2600mAh Rechargeable Batteries (Button Top) with PCB for Flashlights and Others
$32.26
Applications

* Lighting or other device that needs 3.7V power
* Building portable power device needing high energy density and low weight

Warning

* CAUTION: when working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled.
* User should have enough knowledge on Li-Ion rechargeable batteries in charging, discharging, and assembly …

4PC 18650 3600mAh 3.7V Rechargeable Li-Ion Battery + Charger Combo
4PC 18650 3600mAh 3.7V Rechargeable Li-Ion Battery + Charger Combo
$8.96
Function: smart charger for 18650 batteries, 18650 batteries for flashlight, headlight, laser pens, and so on. Designed to charge your batteries quickly and safely. Input Voltage: 110-240V, 47-63Hz Output: 4.2V 600mA Charges 1 or 2 batteries simultaneously Dimensions: 3.34 in x 1.85 in x 1.49 in Weight: 2.46 oz. Capacity: 3600mAh. Voltage: 3.7V. Can be used in laser pointer,Torch Flashlights and o…
3.7V 18650 3000mah Rechargeable Lithium Battery with Charger (2 Batteries)
3.7V 18650 3000mah Rechargeable Lithium Battery with Charger (2 Batteries)
$2.06
18650 Battery Charger: The AC adapter easily folds out to charge and pack away Charge two batteries one time. Compatible with 18650, 16430, 14500, LIR123A, 10440 Li-ion battries LED indication for Power On / Charging / Full charge AC110v-240v 47-63Hz input (international charger, also can be used worldwide) Does not support car power 18650 3.7V Battery: 18650 3000mAh 3.7V rechargeable li-ion batt…
Welltop® 8Pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with Battery Charge+ Free Welltop® Corkscrew
Welltop® 8Pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with Battery Charge+ Free Welltop® Corkscrew
$18.40
Battery Specifications:
1. Cell type: Rechargeable 18650
2. Capacity: 5000mAh
3. Voltage: 3.7V
4. Material: Li-ion
6. Dimensions: 6.5 cm x 2 cm x 2 cm
7. Weight: 0.05 kg

Charge Specifications:
1. Input Voltage: 100V~240V 50/60Hz 150mAh MAX:150mA
2. Output Voltage: 4.2V
3. Output Current: 600mAh
4. Dimensions: 9 cm x 4 cm x 5 cm
5. Weight: 0.08 kg
6. Simultaneously charge the tw…

4Pcs 18650 3.7V 5000mAH Rechargeable Lithium Battery Yellow
4Pcs 18650 3.7V 5000mAH Rechargeable Lithium Battery Yellow
$5.99
From the Manufacturer:
Brand:MicroMall
High quality and durable
Provides continuous power to your device
High energy density, long life battery
Durable in low and high temperature operations
Fit for camera, watch, calculators and other electronic devices
Dimensions: 2.56 x 0.71″ / 6.5 x 1.8 cm (L x Dia)
Color: Yellow
Capacity: 5000mAh
Voltage: 3.7V
Quantity: 4Pcs
Type: 18650 Li-ion Batt…

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