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

Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, package of 2, 3008x2
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, package of 2, 3008×2
$7.50
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…

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
$11.85
Package included 10x lithium batteries Plastic holder(Battery not included! )…
orlov 100x Solder Tab for 14500 18650 Rechargeable Cell LiPo, NiCd and NiMh Battery Packs
orlov 100x Solder Tab for 14500 18650 Rechargeable Cell LiPo, NiCd and NiMh Battery Packs
$11.99
One order includes 100 solder tabs which work very well to connect 18650, 14500, AA, AAA batteries together. These tabs work well with solder or with a spot welder….
Wrisky 10Pcs 4x5 Cell Spacer 18650 Battery Radiating Shell Pack Plastic Heat Holder
Wrisky 10Pcs 4×5 Cell Spacer 18650 Battery Radiating Shell Pack Plastic Heat Holder
$8.19
Material: ABS Color: Black Advantage: Radiating during high rate discharge. Makes your battery pack Solid and Reliable! Tips for building: This Listing is for 10pcs Spacer, could fit 10 x 18650 batteries. Every two 18650 battery cells needs 2 Spacers (one up / one down) Size Approx: 8*10*0.8cm/3.15″”*3.94″”*0.31″” Quantity: 10Pcs Note: Due to the difference between different monitors, the picture …
2PACK 18650 2600mah 3.7v Rechargeable Batteries For Flashlights, torch,power bank cell etc
2PACK 18650 2600mah 3.7v Rechargeable Batteries For Flashlights, torch,power bank cell etc
$9.50
Specification Model:Lithium ion 18650 2600mAh BUTTON top Charging cut-off voltage:4.2v Discharging cut-off voltage:3.0 v…
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
$8.70
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…
Rechargeable 18650 Li-ion Battery with Top Flat, 2200 mAh, 3.7V, Use High-Capacity Battery Cells (1Pack)
Rechargeable 18650 Li-ion Battery with Top Flat, 2200 mAh, 3.7V, Use High-Capacity Battery Cells (1Pack)
$6.99
Specification: Model: 18650 Rechargeable Flat Top Batteries Type: LG 18650 Capacity: 2200mAh Voltage: 3.7V Positive: Flat top Material:Li-ion Charging Time:4-5 hours Item Weight:42g(0.09pound) Warnings: ★Do not overcharge or overdischarge ★Recharge drained batteries in time ★Do not short circuit ★Do not dispose of in fire ★Do not expose to extreme heat or water Package include: 1 pieces …
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
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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