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

4pcs Panasonic NCR18650B 3.6 Volt 18650 Battery 3400 mAh
4pcs Panasonic NCR18650B 3.6 Volt 18650 Battery 3400 mAh
$31.00
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Applications
* Building portable power device that needs high energy density and low weight.
Product Specifications Specification
Item Content Capacity
Nominal Capacity: 3350 mAh
Typical Capacity: 3250 mAh
Minimum Capacity: 3250 mAh
Nominal Voltage 3.6 V
Internal Impednce 32mohm
Discharge Cut-off Voltage 3.0 V
Ma…
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…

Super-Capacity Li-ion Battery For Acer Aspire 3050 3680 5050 5570 5580 TravelMate 3270 2480 3260 series replace CGR-B/ 6H5 3UR18650Y-2-QC261 LC.BTP00.001 series Ac Laptop Notebook Main Battery [ 7800mAh 9 Cells]
Super-Capacity Li-ion Battery For Acer Aspire 3050 3680 5050 5570 5580 TravelMate 3270 2480 3260 series replace CGR-B/ 6H5 3UR18650Y-2-QC261 LC.BTP00.001 series Ac Laptop Notebook Main Battery [ 7800mAh 9 Cells]
$25.45
11.1V/7800MAH, fast shipps,best customer service,30 days money back guarantee,1 year warranty…

Two 3400mAh PROTECTED 18650 Orbtronic (Panasonic NCR18650B cell inside) Li-ion Rechargeable Batteries, and Smart 3 speeds battery charger Kit (Latest Version)
Two 3400mAh PROTECTED 18650 Orbtronic (Panasonic NCR18650B cell inside) Li-ion Rechargeable Batteries, and Smart 3 speeds battery charger Kit (Latest Version)
$53.99
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
$2.00
Rechargeable Lithium batteries are rapidly becoming a very economical way to lower the operating costs of Lithium-Powered flashlights.

Feature
3.6V 18650 size Cylindrical Li-Ion Cell
No memory effect and longer storage life than NiMH Batteries
Lighter weight and higher energy density than any other rechargeable battery
Perfect for building batteries for laptop and other portable power devices…

EBL® UT-2110D Universal LCD Rapid Smart Charger for AA, AAA, C Cell, D Cell, 9V Ni-MH / Ni-Cd Rechargeable Batteries, 18650, 26650, 22650, 18490, 18350, 17670, 17500, 17335, 16340, 14500, 10440 3.7V Cylindrical Li-ion Batteries And 3.2V LiFePO4 Rechargeable Batteries
EBL® UT-2110D Universal LCD Rapid Smart Charger for AA, AAA, C Cell, D Cell, 9V Ni-MH / Ni-Cd Rechargeable Batteries, 18650, 26650, 22650, 18490, 18350, 17670, 17500, 17335, 16340, 14500, 10440 3.7V Cylindrical Li-ion Batteries And 3.2V LiFePO4 Rechargeable Batteries
$25.99
Super Universal: Can charge for different types’batteries: AA,AAA,C,D,9V,18650,26650 Rechargeable Batteries. Worldwide Volage: Accepts input voltages ranging from AC 100-240V 50/60Hz 0.3A MAX, can be used all over the world Multiple DC Output Voltage: Output : DC 12V/1000mA 4 x (1.2V Ni-MH/Ni-Cd AA/AAA/C/D rechargeable batteries: 400mA) 4 x (3.2V/3.6V/3.7V rechargeable Li-ion batteries: 400mA) 1…

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