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

2pcs 18650 Panasonic NCR18650B Cell 3400mAh Rechargeable Li-ion Battery
2pcs 18650 Panasonic NCR18650B Cell 3400mAh Rechargeable Li-ion Battery
$17.98

1.Quality Rechargeable Lithium-ion Cell
2.Model: 18650
3.Nominal Voltage: 3.6V
4.Nominal Capacity: 3400mAh
5.Made in Japan

Detail:
1. Rated Capacity(Minimum): 3200mah (0.65A discharge at 20°C)
2. Nominal Capacity(Minimum): 3250mAh (0.65A discharge at 25°C)
3. Nominal Capacity(Typical): 3350mAh (reference only)
4. Nominal Voltage: 3.6V (0.65A discharge)
5. Discharging End...

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Li-ion Laptop Battery for Gateway 3ur18650f-2-qc-ma1 6msb 6msbg squ-412
Li-ion Laptop Battery for Gateway 3ur18650f-2-qc-ma1 6msb 6msbg squ-412
$8.02
lithium polymer batteries...
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)
$5.28
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...

Zebralight VERY HIGH-Performance ZL634 3400mAh 18650 Protected Li-ion Rechargeable Battery (Panasonic NCR18650B) for Supercharged Flashlights * e-Cigs
Zebralight VERY HIGH-Performance ZL634 3400mAh 18650 Protected Li-ion Rechargeable Battery (Panasonic NCR18650B) for Supercharged Flashlights * e-Cigs
$24.00
Best battery for High-Power flashlight users, or for anyone who is looking for the longest run time possible. This is the largest REAL capacity available on US market....

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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
$35.00
Unlike other protected batteries that will cut off all power at only 4 Amps, Orbtronic protected 18650 batteries will provide power at 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 by Seiko. ICs m...

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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
$3.22
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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