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

Vamped Vapor Cells IMR 18650 2000mAh Flat Top Hi Drain Rechargeable Battery 40AMPS (2 PCS)
Vamped Vapor Cells IMR 18650 2000mAh Flat Top Hi Drain Rechargeable Battery 40AMPS (2 PCS)
$24.95

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
$6.71
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. …
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)
$5.59
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…

Gateway Genuine 12MSBG Battery 4UR18650F-3-QC-MA1
Gateway Genuine 12MSBG Battery 4UR18650F-3-QC-MA1
$19.99
100% Brand New 12 Cell Li-ion Battery Pack for Gateway various Laptop.

Gateway Part Number: AHAC4322A15
Model Number: 4UR18650F-3-QC-MA1. Also compatible with 6MSGB but has the benefits of 12cells.
12 Cell Battery.
Output: 14.8V 6600mAH…

Vamped Vapor Cells IMR 18650 2000mAh Hi Drain Rechargeable Battery 40AMPS
Vamped Vapor Cells IMR 18650 2000mAh Hi Drain Rechargeable Battery 40AMPS
$9.98

DROK White LED 0.36 3.0~30V Small Voltmeter Digital 18650 Cell-phone Lithium Battery Tester 5/12V DC Voltage Meter
DROK White LED 0.36 3.0~30V Small Voltmeter Digital 18650 Cell-phone Lithium Battery Tester 5/12V DC Voltage Meter
$5.98
Features:
Cutting size: 23mm x 14mm
Thickness: 10mm
Mounting Hole Center Distance: 28mm
Measure Voltage:  DC 3.0~30V (No Need power supply, measure Directly)
Input Polarity: DC Voltage
Measurement Accuracy: 1% (+ / – 2 digit)
Display: Three 0.36″ digital LED Tube
Display Color: White
Refresh Rate: about 500mS / times
Operating Temperature: -10°c ~ 65°c
Reverse protection: have
when measure 10V …

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