UltraFire WF502B Flashlight CREE XM-L T6 LED 3 Output Run on 18650 3.7v Battery NOT Included
18650 3000mAh 3.7V Rechargeable Li-Ion Battery + Charger Combo
Eternally?ultrafire 18650 3000mah 3.7v Rechargeable Li-ion Battery (Pair) + Charger Combo
Ultrafire 18650 3000mah 3.7v Rechargeable Li-ion Battery (Pair) + Charger Combo,travel Charger Folds up for Easy Transport
4pcs Ultrafire 18650 3000 mAh 3.7V Li-ion Rechargeable Battery+1pcs Charger
UltraFire 4200mAh 18650 3.7v Rechargeable Battery for Led Flashlight
8 Pieces 18650 3000 Mah 3.7v Li-ion Lithium Ion Rechargeable Battery Household Batteries with 2 Slot LED Indication Charger , Red Color Battery
GOgroove SonaVERSE BX Rechargeable Portable 3.5mm Stereo Speaker for Smartphones, Tablets, MP3 Players, Portable Devices & More
Brand new li-ion rechargeable UltraFire 18650 3000mAh 3.7V Battery (four) + Charger Combo for led light torch Flashlight
hao AA and 14500 Circuit Board for 3.7V LED Emitters 3-Pack (1.5V~4.2V Input)
Dc/dc Converter 12v Step Down to 3.7v 3a Power Supply Module
Charger +8x ICR 14500 3.7v Aa Li-ion Rechargeable Battey for Ultrafire LED Torch
hkbayi UltraFire E17 2000 Lumen Flashlight Led Cree T6 XM-L Camping Torch Flash Light The Lamp With Mount Holder Set + 2pcs 18650 Li-ion Battery 4000mah Ultrafire 3.7v Batteries + 18650 Dual Charger
Generic Battery Charger for 18650 Rechargeable Li-Ion 3.6V 3.7V AC110-240V
Ambient Weather WR-333-U Emergency Solar Hand Crank Weather Alert Radio, Flashlight, Smart Phone Charger, AC and DC Adaptors
SecurityIng? High Discharge Performance 2PCS True 2600mAh 3.7V 18650 Rechargeable Li-ion Battery for LED Flashlights and Headlamps With Special Portable Battery Box
Syma S107/S107G R/C Helicopter *Colors Vary
HD 1080P Car DVR Vehicle Camera Video Recorder Dash Cam G-sensor HDMI GS8000L. My KN (HD 1080P Car DVR Vehicle Camera Video Recorder Dash Cam G-sensor HDMI GS8000L)
Hausbell (TM) White Portable Folding Eye Protection LED USB Port Rechargeable Desk Lamp Reading Lamp Camping Lamp with Calendar Clock Alarm Control Thermometer
Cree R2 Drop-In 1-Mode LED Module (3.7V~18V / 26.5mm x 29mm) (1Package)
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3.7V Led Popular Q&A
Q: Can you use a 3.7v AC adapter for an LED light that recommends a ...
A: You will be undervolting the LED by .3V, but otherwise it should work ok. Note the LED will not be quite as bright as it would be with 4V, but 0.3V isn't much t... Read More »
Q: Do 12v led bulbs require a minimum of 12v to work? would a 3.7v w...
A: The 4-cell solution will work but the LED life will be radically shortened if it's much over the rating - then again, the life is usually stated in 10s of thous... Read More »
Q: S been days on end looking for a schematic for a battery charging...
A: The first link shows a sot-23 charging IC from linear. But I've thrown in a bunch of other links, too. Wish I knew more about the topic, but it was fun skimming... Read More »
3.7V Led Helpful Resources
The big no-no... LEDs in parallel - All About Circuits Forum
No need for resistors or anything. bright white LED's and 3.7V lion's are the perfect combination. But You will need a regulator if you using 12V ...
ZXSC310-DN63: 3 (~ 8) LEDs @ 12.5 mA @ 3.7V - Digikey
Low cost, small simple and low power multi-LED drive solutions are important in applications including LCD backlight, key illuminations and effects for handheld ...
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