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

Intervine High Performance Lithium Ion 18650 2400 mAh Rechargeable Battery - 2 Pack
Intervine High Performance Lithium Ion 18650 2400 mAh Rechargeable Battery – 2 Pack
$12.97
Power Your Adventures With the Intervine Brand of High Capacity and Long Lasting Rechargeable Batteries – High Capacity and Long Lasting Lithium Ion Rechargeable Batteries Provide Amazing Power at an Incredible Value – Perfect for All Electronic Devices including our very own Supernova Camping Lanterns and Tactical Flashlights! – 2400 mAh Provides Ample Power for Long Lasting Use Backed by our No …
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
$11.42
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…
uxcell® 20pcs 18650 Lithium Battery Triple Holder Bracket for DIY Battery Pack
uxcell® 20pcs 18650 Lithium Battery Triple Holder Bracket for DIY Battery Pack
$9.45
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, 3-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…
Haobase 5pcs Black Battery Storage Box Case Holder for 3.7V 18650x1 Batteries
Haobase 5pcs Black Battery Storage Box Case Holder for 3.7V 18650×1 Batteries
$5.20
Package Content : 5 x Battery Case Holder…
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
$8.24
    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® 4pcs 3.7V 18650 3400mah Rechargeable Li-ion Battery with PCB for LED Flashlight, Headlamps, search light lamp, etc
Intsun® 4pcs 3.7V 18650 3400mah Rechargeable Li-ion Battery with PCB for LED Flashlight, Headlamps, search light lamp, etc
$15.89
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 electron…

2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
$9.80
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…

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