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, 3008
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
$5.75
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...

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2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
$8.95
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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49 Pcs 18650 Lithium Cell Battery Holder Bracket for DIY Battery Pack
49 Pcs 18650 Lithium Cell Battery Holder Bracket for DIY Battery Pack
$8.66
18650 cylindrical battery holder, fire retardant pc+pp+gp materials; Crack resistant edge with the slot, with the firm, It can accomodate various size; Battery installation hole diameter 18.3mm, 1-linked structure, Nickel plate vibration test can be conducted without attachment to any device. Suitable for all types of battery assembly including do it option. Please note, installation requires to...
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
$19.99
Features:
* High quality and durable.
* No memory effect, Environmentally friendly.
* Provides excellent continuous power sources to your device.
* This battery has an extra long life for all your battery powered devices.
* With overcharge / discharge protection function that you can use it without worry.
* Can be used in laser pointer, Led Flashlights, Headlamps and other electronic produc...
18650 Battery,4 Pcs GOODFIRE 18650 3.7V 6800mAh Lithium Ion Parallel Battery(Red)
18650 Battery,4 Pcs GOODFIRE 18650 3.7V 6800mAh Lithium Ion Parallel Battery(Red)
$9.99
4Pcs GOODFIRE 18650 3.7V 6800mAh Lithium Ion Parallel Battery Description:Brand Name:GOODFIREBattery Model No:18650Capacity (mAh):6800mAhCell type:Li-ionRechargeable:YesWith Charger:NoVoltage (V):3.7VUnits Per Box:1Dimensions (cm):6.5*1.8*1.8Weight (kg):0.037Package included:4 x Batteries...
BestFire® 2Pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with 18650 battery Charger Yellow
BestFire® 2Pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with 18650 battery Charger Yellow
$10.98
...

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Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
$13.98
Features:
* High quality and durable.
* No memory effect, Environmentally friendly.
* Provides excellent continuous power sources to your device.
* This battery has an extra long life for all your battery powered devices.
* With overcharge / discharge protection function that you can use it without worry.
* Can be used in laser pointer, Led Flashlights, Headlamps and other electronic produc...

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