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

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Power Bank, VINSIC 6000mAh Portable Power Bank, 5V 2.1A External Mobile Battery Charger Pack for iPhone, iPad, iPod, Samsung Devices, Cell Phones, Tablet PCs (Green)
Power Bank, VINSIC 6000mAh Portable Power Bank, 5V 2.1A External Mobile Battery Charger Pack for iPhone, iPad, iPod, Samsung Devices, Cell Phones, Tablet PCs (Green)
$17.95
Power Bank Vinsic 6000mAh

Description
This high capacity 6000mAh external mobile battery charger is designed with a standard 5V 2.1A output USB port.
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Superb Choice 9-cell Laptop Battery for GATEWAY MX8530 MX8711 MX8734 MX8739
Superb Choice 9-cell Laptop Battery for GATEWAY MX8530 MX8711 MX8734 MX8739
$23.99
Products trademarked Superb Choice are registered and marketed by Superb Choice.Replacement for GATEWAY SQU-412 SQU-413 SQU-414 SQU-415 916C4730F MA1 MA1 3S2P MA1 4S2P 2PA2BTLI602 2MA7BTLI612 2MA3BTLI603 QND1BTIZZZ00W8 QCD1BTIZZZTAV4 QND1BTIZZZTAV4 QND1BTIZZZTAW2 AHA842240a0 AHA63224A34 AHA63224819 AHA63224614 AHA63226064 QND1BT1ZZZTAV4 QND1BT1ZZZTAW2 QND1BTIZZZ00T5 QND1BTIZZZ00V0 QCD1BT1ZZZTAV4 Q...
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]
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11.1V/7800MAH, fast shipps,best customer service,30 days money back guarantee,1 year warranty...

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EBL® 4 Pack 18650 3.7V 3000mAh Rechargeable li-ion Battery with Universal Charger for 10440,14500,16340,18500,18650 Rechargeable Li-ion Battery
EBL® 4 Pack 18650 3.7V 3000mAh Rechargeable li-ion Battery with Universal Charger for 10440,14500,16340,18500,18650 Rechargeable Li-ion Battery
$15.99
Updated Version Red color 18650 rechargeable battery in 3000mAh from February 2, 2015

About EBL®

EBL® is a certified brand manufacture that product EBL® series general use battery ,battery charger and flashlight.All products and packages are marked with EBL® which can only enjoy the rights by seller and manufacture '30 days money back and 1 year limited warranty '.All EBL® chargers ar...

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
$18.99
Features:
* High quality and durable.
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* 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...
3Pcs Double Wire Rectangle 4 x 3.7V 18650 Battery Holder Case Cell Box
3Pcs Double Wire Rectangle 4 x 3.7V 18650 Battery Holder Case Cell Box
$8.86
for 4 x 3.7V 18650 battery. Please pay attention to the Specification Table before purchasing, make sure our product is right what you want. Battery is not included here. ...

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