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

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Foxnovo ICR18650 2600mAh 3.7v 9.6Wh High Drain IC Protected 18650 Rechargeable Li-ion Battery (1)
Foxnovo ICR18650 2600mAh 3.7v 9.6Wh High Drain IC Protected 18650 Rechargeable Li-ion Battery (1)
$8.99
High Quality and Durable

Adopts Samsung ICR18650-26F Li-ion Battery Cells, High Quality and Durable

Application

Application LED laser pointer, Flashlights, LED torch and various household electronic products

12-month Warranty

What You Get: Foxnovo® 18650 Rechargeable Li-ion Batterys, our fan-favorite 12-month warranty and friendly customer service.

Specifications

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TangsFire® (4 Pack) 18650 / 18350 16340 cr123a 4 Cell Battery Case (Blue Green Purple Orange)
TangsFire® (4 Pack) 18650 / 18350 16340 cr123a 4 Cell Battery Case (Blue Green Purple Orange)
$5.19
Specification:
1. Tpye: 18650 18350 battery Stroage case
2. material: ABS
3. The applicable objects: 18350 battery or CR123A/18650/16340 Battery
4. color: Blue Green Purple Orange
5. weight:20G
6. size: 77 X 22 X 40 (L x H x W) *cm
Package includes:
1 x 4Pcs TangsFire® 18650 / 18350 16340 cr123a 4 Cell Battery Case (battery not include)

This battery case is a perfect solution fo...

2 Pcs Black Plastic Battery Holder Case w Wire for 4 x 18650 14.8V
2 Pcs Black Plastic Battery Holder Case w Wire for 4 x 18650 14.8V
$4.04
This battery box holder with wire connector, fit for 4 x 18650 14.8V batteries.With spring clip design, you can easily to put the battery in it.Battery is not included here. ...

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Intsun® 4pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB for LED Flashlight, Headlamps, search light lamp, etc (4xBattery)
Intsun® 4pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB for LED Flashlight, Headlamps, search light lamp, etc (4xBattery)
$17.95
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...

TWO 3400mAh 18650 PROTECTED Orbtronic Li-ion (Panasonic inside) 3.7V Battery cells, 10 Amp Dual Protection - For High Performance 18650 flashlights - Protective Battery Case Included
TWO 3400mAh 18650 PROTECTED Orbtronic Li-ion (Panasonic inside) 3.7V Battery cells, 10 Amp Dual Protection - For High Performance 18650 flashlights - Protective Battery Case Included
$29.71
Unlike other protected batteries that will cut off all power at only 3-4 Amps, Orbtronic protected 18650 batteries will provide power at uninterrupted currents much higher than 4 Amps. Protection: Over-current (Activated @ 10A-12A), Over-charge (Activated @ 4.35V) - Over-discharge (Activated @ 2.5V) - Over-temp. and DUAL short circuit protection (External, and Internal).Protection circuit designed...
2 Pcs Black Plastic Battery Holder Case w Wire for 3 x 18650 11.1V
2 Pcs Black Plastic Battery Holder Case w Wire for 3 x 18650 11.1V
$4.70
This battery box holder with wire connector, fit for 3 x 18650 11.1V batteries.With spring clip design, you can easily to put the battery in it.Battery is not included here. ...

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