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

5pc Exell Battery Li-FePO4 Size 18650 Rechargeable Battery 3.2V 1500mAh Garden Lights Solar Lamps e-cigarettes Flashlights FAST USA SHIP
5pc Exell Battery Li-FePO4 Size 18650 Rechargeable Battery 3.2V 1500mAh Garden Lights Solar Lamps e-cigarettes Flashlights FAST USA SHIP
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5x Exell LiFePO4 Size 18650 Rechargeable Solar Battery 3.2V 1500mAh Great economical choice for any device that uses rechargeable 18650 batteries. This lithium iron phosphate rechargeable battery is a good solution for replacing the batteries in solar lights. Rechargeable Solar light batteries eventually lose their ability to store energy and need to be replaced. Be sure to replace your rechargeab...
(2 Pieces) 30A Sony 18650 Battery 1600mAh 3.7V High Drain US18650VTC3
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(2 Pieces) 30A Sony 18650 Battery 1600mAh 3.7V High Drain US18650VTC3...
20 Pcs 18650 Lithium Cell Battery Holder Bracket for DIY Battery Pack
20 Pcs 18650 Lithium Cell Battery Holder Bracket for DIY Battery Pack
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CWK® New Replacement Laptop Notebook Battery for Asus A42-G74 G74 G74J G74JH G74S G74SW G74SX 59wHr A42-G74 ICR18650-26F LC42SD128 G74 G74J G74S G74S-XR1 G74SX A42-G74 G74SX G74SX-3D G74SX-A2 G74S-XR1 G74SX-XC1 G74SX-XT1 Asus A42-G74 LC42SD128 G74 G74J G74JH G74S G74SW G74SX
CWK® New Replacement Laptop Notebook Battery for Asus A42-G74 G74 G74J G74JH G74S G74SW G74SX 59wHr A42-G74 ICR18650-26F LC42SD128 G74 G74J G74S G74S-XR1 G74SX A42-G74 G74SX G74SX-3D G74SX-A2 G74S-XR1 G74SX-XC1 G74SX-XT1 Asus A42-G74 LC42SD128 G74 G74J G74JH G74S G74SW G74SX
$28.98
CWK Platinum Quality Features: * Condition: Brand New - Grade A cells* Low power consumption IC design* Over-charge/discharge protection * Over-heat/current protection * Short-circuit protection* Fully compatible with the original laptops* Tested with strict quality control standardsCompatible models & part#:Asus A42-G74 G74 G74J G74JH G74S G74SW G74SX 59wHr A42-G74 ICR18650-26F LC42SD128 G74 G74J...
Bavvo 6-cell Laptop Battery for Gateway 3ur18650f-2-qc-ma1 4ur18650f-2-qc223 6msb 6msbg aha63224819, 11.1V
Bavvo 6-cell Laptop Battery for Gateway 3ur18650f-2-qc-ma1 4ur18650f-2-qc223 6msb 6msbg aha63224819, 11.1V
$23.98
Trademark Bavvo products are marketed exclusively by Bavvo. OEM compatible! High capacity battery certified by CE and RoHS, This battery was tested and proven to match and/or exceed original specifications of GATEWAY products. Fit Machine Models:Gateway 3ur18650f-2-qc-ma1 4ur18650f-2-qc223 6msb 6msbg aha63224819 squ-412...
12-Cell Battery for Gateway 4UR18650F-2-QC223 M360 M460 M465-E M680 MA1 MA2 MA3 MA6 MA7 ML6703 ML6720 MT3709 MT6705 MT6709 MT6711 MT6728 MT6729 MT6730 MT6821 MX6000 MX6453 MX6455 NX500 NX850 W340UI
12-Cell Battery for Gateway 4UR18650F-2-QC223 M360 M460 M465-E M680 MA1 MA2 MA3 MA6 MA7 ML6703 ML6720 MT3709 MT6705 MT6709 MT6711 MT6728 MT6729 MT6730 MT6821 MX6000 MX6453 MX6455 NX500 NX850 W340UI
$37.83
Compatible Models/Replaced P/N : Gateway 4UR18650F-2-QC223 M360 M460 M465-E M680 MA1 MA2 MA3 MA6 MA7 ML6703 ML6720 MT3709 MT6705 MT6709 MT6711 MT6728 MT6729 MT6730 MT6821 MX6000 MX6453 MX6455 NX500 NX850 W340UI...
TWO 3400mAh 18650 PROTECTED Orbtronic Li-ion (Panasonic inside) 3.7V Battery cells, 10 Amp Dual Protection - For High Performance 18650 flashlights - Protective Battery Case Included
TWO 3400mAh 18650 PROTECTED Orbtronic Li-ion (Panasonic inside) 3.7V Battery cells, 10 Amp Dual Protection - For High Performance 18650 flashlights - Protective Battery Case Included
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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), Over-charge (Activated @ 4.35V) - Over-discharge (Activated @ 2.5V) - Over-temp. and DUAL short circuit protection (External, and Internal).Protection circuit designed by Seiko. ICs m...

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ECAREE 3W SMD High Power Head Lamp Series C - 57: 3W SMD High Power Head Lamp, Aluminum Alloy + 2x18650 Batteries (2800MA with Cell Protection Board) + 1 AC Recharger
ECAREE 3W SMD High Power Head Lamp Series C - 57: 3W SMD High Power Head Lamp, Aluminum Alloy + 2x18650 Batteries (2800MA with Cell Protection Board) + 1 AC Recharger
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ECAREE VA0057 3W SMD High Power Head Lamp, Aluminum Alloy + 2x18650 Batteries (2800MA with Cell Protection Board) + 1 AC Recharger is designed with aluminum alloy and plastic. The SMD service life is more than 100, 000 hours. The switch is on the back of the lamp. Biking and hunting: As bright as a spotlight. Camping trip and hiking: portable enough in any bag with the compact size. Repairing: Fl...

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