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
$25.88
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…

Thyrm CellVault XL
Thyrm CellVault XL

Like the original CellVault, the CellVault XL protects batteries and other critical gear while keeping it accessible and organized. The integrated webbing clip allows you to access the CellVault’s contents without removing it, or you can quickly detach it for more control. New to the XL is a removable internal divider that helps organize batteries when in place, but allows for more storage space w…

Intsun 4pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc ...
Intsun 4pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc …

Vicmax A8 7200 Lumens 8Pcs x Cree XM-L2 U2 Led Bicycle Light, 7800mAh Battery Pack with Waterproof Box (6 Cell x Samsung 18650 Lithium Battery)- Free 5 Led Taillight
Vicmax A8 7200 Lumens 8Pcs x Cree XM-L2 U2 Led Bicycle Light, 7800mAh Battery Pack with Waterproof Box (6 Cell x Samsung 18650 Lithium Battery)- Free 5 Led Taillight
$65.00
Features: 1) Exclusive patent: Mini bicycle light design 2) Model of LED: 8 Cell*CREE XM-L2 U2 (Max 10W), life of led is 100,000 hours 3) Output bright can come to max 7200 lumens 4) Internal wiring applies the high efficient booster circuit, working voltage is wide and can utilize the batteries in the largest extent. 5) IPX-6 Water proofing design 6) Shell aviation grade aluminum mate…
Farmunion 10PC 18650 Battery 4x5 Cell Spacer Radiating Shell Plastic Holder Bracket 18.4mm
Farmunion 10PC 18650 Battery 4×5 Cell Spacer Radiating Shell Plastic Holder Bracket 18.4mm
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8pcs 18650 3.7V 9800mAh Yellow Li-ion Rechargeable Battery Cell For Torch
8pcs 18650 3.7V 9800mAh Yellow Li-ion Rechargeable Battery Cell For Torch
$11.99
* Chemistry: Li-ion *Recharge: up to 1000 cycles Package included: 8 x 18650 3.7V Li-ion 9800mAh UltraFire rechargeable battery ***Free & Fast Shipping***…
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
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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