18650 Battery Cell

18650 Battery Cell
Electric Bike (ebike) Battery Question: Getting 24 Volts in a Lightweight Package?

I’m in the planning stages of building an electric bike. Initially, I was going to buy a great quantity of lithium-ion cells (size 18650) and hook them up to provide me with 24 or 36 volts of power. But recently I have been thinking of using some quality lead-acid (think Optima!) batteries. The only problem is car batteries are pretty big! I am thinking that two Optima D51 batteries would be manageable– they are Optima’s smalles battery, but each one is still 26 pounds. They also provide 38 Ah (each!!!). Yah, that’s a lot of power, but also a lot of weight. My question is this: is there a viable means of converting 12 volts to 24 volts without substantial power loss? I would rather just use one Optima battery, but they only come in 12 volts. Also, can anybody recommend some small deep-cycle lead acid batteries in which I could put two in a serial configuration? Any other advice? Cheers and thank:)

“converting 12 volts to 24 volts without substantial power loss?”

You don’t get something for nothing. Yes, you could use a DC-DC converter, which would weigh a few pounds, but you would convert 12 volts at (eg) 10 amps to 24 volts at 5 amps, minus about 20 %, or 4 amps.

You need to go thru the numbers. Check the weight and power output of the Li-ion batteries, then check a 12v lead-acid with converter, then other alternatives. Calculate watt-hours per pound for each.

You can get watt-hours from amp-hours by multiplying it by the battery voltage. watt-hours is a unit of energy.

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[5 min project]Charging 18650 battery with old mobile phone

10400mAh LCD External Battery Power Bank 18650 Battery Charger Box with 2-Port 5A for iPhone 6 Plus 5S Galaxy S6 S5 Nexus 5 HTC One
10400mAh LCD External Battery Power Bank 18650 Battery Charger Box with 2-Port 5A for iPhone 6 Plus 5S Galaxy S6 S5 Nexus 5 HTC One
$21.99
Main Features: Perfect appearance and performance Easy to take and charge conveniently LCD indicates the actual power and interface status Rapid charge,low power consumption, power lasting Can be charged for a variety of brand mobile phone, tablet computer, router, PDA, iPod/iPhone/iPad, PSP and other digital products Double USB output Electricity-saving function Environmental friendliness and …
uxcell 49 Pcs 18650 Lithium Cell Battery Holder Bracket for DIY Battery Pack
uxcell 49 Pcs 18650 Lithium Cell Battery Holder Bracket for DIY Battery Pack
$8.55
18650 cylindrical battery holder, fire retardant pc+pp+gp materials; Crack resistant edge with the slot, with the firm, It can accomodate various size; Battery installation hole diameter 18.3mm, 1-linked structure, Nickel plate vibration test can be conducted without attachment to any device. Suitable for all types of battery assembly including do it option. Please note, installation requires to…
2x18650 Battery Cell Spacer Radiating Shell EV Pack Plastic Heat Holder 18.4 (4*5 hole)
2×18650 Battery Cell Spacer Radiating Shell EV Pack Plastic Heat Holder 18.4 (4*5 hole)
$5.99
This holder dia is 18.4mm
Due to different brand.the battery size have some difference, the following is some brand battery size.
LG-18650-2600 : 18.3±0.1 mm (Max 18.4 mm)
SAMSUNG ICR18650-26 2600mAh : MAX18.35mm
SANYO UR18650F 2200mAh: Max.18.1 mm

Note: It would be a bit hard to fully fit every spacer by hand, you may use a small hammer to slightly hit the slot for perfect fix.
The…

50pcs 18650 Lithium Battery Double Holder Bracket for DIY Battery Pack
50pcs 18650 Lithium Battery Double Holder Bracket for DIY Battery Pack
$9.74
18650 cylindrical battery holder, fire retardant pc+pp+gp materials; Crack resistant edge with the slot, with the firm, It can accomodate various size; Battery installation hole diameter 18mm, 2-linked structure, Nickel plate vibration test can be conducted without attachment to any device. Suitable for all types of battery assembly including do it option. Please note, installation requires t…
Two Wire Spring Clip 3 x 3.7V 18650 Cell Battery Holder Box Black 3pcs
Two Wire Spring Clip 3 x 3.7V 18650 Cell Battery Holder Box Black 3pcs
$7.72
This battery box holder with wire connector, fit for 3 x 3.7 V 18650 size batteries. With spring clip design, you can easily to put the battery in it. Battery is not included here. …
3Pcs Double Wire Rectangle 4 x 3.7V 18650 Battery Holder Case Cell Box
3Pcs Double Wire Rectangle 4 x 3.7V 18650 Battery Holder Case Cell Box
$8.17
    for 4 x 3.7V 18650 battery.    Please pay attention to the Specification Table before purchasing, make sure our product is right what you want.    Battery is not included here….
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
$12.99
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. * 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…
SunLabz® 18650 3.7V Rechargeable (2-Pack) Flat Top Battery Cells 3400mAh
SunLabz® 18650 3.7V Rechargeable (2-Pack) Flat Top Battery Cells 3400mAh
$12.95

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