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

4 INR18650-25R 18650 Samsung Cells 2500mAh 3.7v Rechargeable Flat Top Batteries- Includes GMT Safety Cases FOR EASIER STORAGE AND TRANSPORT BONUS 2 FREE CASES
4 INR18650-25R 18650 Samsung Cells 2500mAh 3.7v Rechargeable Flat Top Batteries- Includes GMT Safety Cases FOR EASIER STORAGE AND TRANSPORT BONUS 2 FREE CASES
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4 INR18650-25R 18650 2500mAh 3.7v Rechargeable Flat Top Batteries Includes 2 GMT Safety Cases for Easy Storage! Product Description 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…
3400mAh 18650 Battery ORBTRONIC PROTECTED Button Top Rechargeable High Performance Li-ion 3.7V for High Power Flashlights
3400mAh 18650 Battery ORBTRONIC PROTECTED Button Top Rechargeable High Performance Li-ion 3.7V for High Power Flashlights

Universal Battery Charger, EASTSHINE S2 LCD Display Speedy Smart Charger for Rechargeable Batteries Ni-MH AA AAA Li-ion LiFePO4 IMR 10440 14500 16340 18650 26650
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LUMINTOP Protection Circuit Rechargeable 18650 Li-ion Battery 3400mAh LM34
LUMINTOP Protection Circuit Rechargeable 18650 Li-ion Battery 3400mAh LM34
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LUMINTOP® Rechargeable 18650 Li-ion Battery 3400mAh LM34 with Protection Circuit Mode: LM34 Cell Mode: Panasonic NCR18650B Capacity: 3400mAh Voltage: 3.7V Charging Cycle: 500 times Charging Current: 1A?Recommended? 2A(Max) Size: Length: 2.71″ (68.8mm) Diameter: 0.73″ (18.6mm) N.W 1.69oz(47.8g)…
Farmunion 10PC 18650 Battery 4x5 Cell Spacer Radiating Shell Plastic Holder Bracket 18.4mm
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Package included 10x lithium batteries Plastic holder(Battery not included! )…
3400mAh 18650 Battery ORBTRONIC PROTECTED Button Top Rechargeable High Performance Li-ion 3.7V for High Power Flashlights (Pack of: 4x batteries)
3400mAh 18650 Battery ORBTRONIC PROTECTED Button Top Rechargeable High Performance Li-ion 3.7V for High Power Flashlights (Pack of: 4x batteries)
$57.99
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)—->>Included: Four 18650 3400mAh Protected Orbtronic batteries. and Two Protective battery holders. — IMPORTANT These are NOT AA batteries. >> For buyers without previous experience…
8pcs 18650 3.7V 9800mAh Yellow Li-ion Rechargeable Battery Cell For Torch
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Features: 100% Brand new and high quality! 18650 3.7 V Li-ion 9800mAh rechargeable batteries. Perfect for Flashlight, Rc toy or electronic gadgets. 100% QC of every battery . Product properties: Brand: none is_customized: Yes Type: Li-ion Model Number: None Size: Other Nominal Capacity: 9800mAh Specifications: Capacity: 9800mAh Voltage: 3.7 V Chemistry: Li-ion Recharge: up to …
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
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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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