Can these bulbs be used to replace the christmas led of the 5mm that are concave style?

... Depends entirely on the specifics of the "Christmas LED" (and what you mean by "concave style"). If the original string shares the same electrical characteristics as these, then sure--but there's no way to randomly guess what kind of LEDs you're trying to replace.

Do you have leds of 1.5 volts available?

I do not have any but there might be some out there. Try DigiKey or Mouser electronics.

Can I use a 9v battery

Dear customer, voltage range of these diodes are: R/Y 2.0-2.2V; B/G/W 3.0-3.2V. 9v battery could only be used with proper resistors. Thank you for asking and hope this answer could be helpful.

These + a 2-3 volt DC button battery and it lights up? Aside from a switch and the connections, anything else needed?

depends on the purpose of your use of the LED. I used several to illuminate a model r/c airplane with two 1.5 AAA batteries and an off and on switch. They can be soldered together plus to minus leads in series or connected by lengths of wire. Note: some require different voltages identified on the container lid

Dicuno 450pcs 5mm Led Diode Led Light Kit Box 5

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Description

⚡ Light up your creativity with DiCUNO’s ultimate LED kit!

COMPACT YET POWERFUL - Mini 5mm LEDs with a focused 30° beam angle deliver sharp, eye-catching illumination.
ILLUMINATE EVERY IDEA - 450 premium 5mm LEDs in 5 vibrant colors to bring your DIY projects to life.
EFFORTLESS ORGANIZATION - Smartly labeled kit box keeps your LEDs sorted and ready—no more hunting or mix-ups.
PRECISION BRIGHTNESS CONTROL - Color-specific forward voltages and luminous intensities ensure optimal lighting performance every time.
VERSATILE APPLICATION POWERHOUSE - Perfect for electronics, science experiments, car décor, and creative lighting innovations.

The DiCUNO 450pcs 5mm LED Diode Kit offers a professional-grade assortment of super bright LEDs in five distinct colors, each with precise voltage and luminous intensity specifications. Packaged in a neatly labeled box, this kit is designed for seamless use in DIY electronics, science experiments, and decorative lighting projects, delivering reliable, vibrant illumination with a focused 30° beam angle.

Specifications

ASIN	B073QMYKDM
Accepted Voltage Frequency	220 to 240 Volts and 50 Hertz
Additional Features	Super bright 5mm LED, 450 pcs (5 color * 90 pcs) ; Mark color and voltage clearly in label. Box Kit for sorting. Don’t worry you will mix them up or lose them. Widely applied to DIY LED Projects, School Science Experiments, Car Decorations, etc.
Beam Angle	30 degrees
Best Sellers Rank	#10,368 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in LED Lamps #3,127 in Electrical Equipment
Brand	DiCUNO
Brand Name	DiCUNO
Bulb Base	Prong
Bulb Shape Size	B9
Color	White, Red, Yellow, Green, Blue
Color Temperature	8000 Kelvin
Connectivity Technology	Normal bulb
Control Method	App
Controller Type	Push Button
Customer Reviews	4.7 out of 5 stars 2,481 Reviews
Efficiency	High
Incandescent Equivalent Wattage	100 watt-hours
Included Components	LED Diodes, Kit Box
Indoor Outdoor Usage	Indoor
Item Dimensions W x H	0.91"W x 3.66"H
Item Weight	170 g
Light Color	Blue
Light Source Type	LED
Light Source Wattage	0.06 watts
Light Type	LED
Manufacturer	DiCUNO
Manufacturer Part Number	5C-5MM 450 L
Material Type	Plastic
Model Name	5C-5MM
Model Number	5C-5MM 450 L
Number of Items	1
Package Quantity	1
Power Source	Corded Electric
Shape	Round
Special Feature	Super bright 5mm LED, 450 pcs (5 color * 90 pcs) ; Mark color and voltage clearly in label. Box Kit for sorting. Don’t worry you will mix them up or lose them. Widely applied to DIY LED Projects, School Science Experiments, Car Decorations, etc. Special Feature Super bright 5mm LED, 450 pcs (5 color * 90 pcs) ; Mark color and voltage clearly in label. Box Kit for sorting. Don’t worry you will mix them up or lose them. Widely applied to DIY LED Projects, School Science Experiments, Car Decorations, etc. See more
Specific Uses For Product	Indicator lights
Style Name	Modern
UPC	606046645177
Unit Count	450 Count
Voltage	2 volts
White Brightness	2000 lumens

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