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

New 2x Red 18650 Ultrafire Li-ion LED Flashlight Torch Rechargeable Battery Cell
New 2x Red 18650 Ultrafire Li-ion LED Flashlight Torch Rechargeable Battery Cell
$0.01

TangsFire® 4pcs 18650 3600mAh 3.7V Protected Li-ion Rechargeable Battery and 2Pcs 18650 battery case (Green)
TangsFire® 4pcs 18650 3600mAh 3.7V Protected Li-ion Rechargeable Battery and 2Pcs 18650 battery case (Green)
$20.55
Features:
1.New brand: TangsFire
2.High quality and durable
3.Provides excellent continuous power sources to your device
4.High energy density, long life battery
5.This battery has an extra long life for all your battery powered devices
6.Can be used in laser pointer,Torch Flashlights and other electronic products

Specifications:
1.Battery Type: 18650 3.7v Protected Rechargeable Li-ion Battery
2….

EBL® 4 Pack 18650 3.7V 2600mAh Rechargeable li-ion Battery with Universal Charger for 10440,14500,16340,18500,18650 Rechargeable Li-ion Battery
EBL® 4 Pack 18650 3.7V 2600mAh Rechargeable li-ion Battery with Universal Charger for 10440,14500,16340,18500,18650 Rechargeable Li-ion Battery
$14.99
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 are up to the standard of Indoor use only,Automatic charge,100-240V Worldwide Voltage,Environme…
TangsFire® (4 Pack) 18650 / 18350 16340 cr123a 4 Cell Battery Case (Blue Green Purple Orange)
TangsFire® (4 Pack) 18650 / 18350 16340 cr123a 4 Cell Battery Case (Blue Green Purple Orange)
$5.59
Specification:
1. Tpye: 18650 18350 battery Stroage case
2. material: ABS
3. The applicable objects: 18350 battery or CR123A/18650/16340 Battery
4. color: Blue Green Purple Orange
5. weight:20G
6. size: 77 X 22 X 40 (L x H x W) *cm
Package includes:
1 x 4Pcs TangsFire® 18650 / 18350 16340 cr123a 4 Cell Battery Case (battery not include)

This battery case is a perfect solution fo…

Bay Valley Parts 6-Cell 11.1V 4800mAh New Replacement Laptop Battery for Gateway 103926, 106214, 106868, 1533557, 3UR18650F-2-QC-MA1, 3UR18650F-2-QC-MA6, 3UR18650F-2-QC224, 6500948, 6500996, 6501053, 6501054, 6501055, 6501117, 6501128, 6501130, 6501142, 6501147, 6501193, 6501194, 501195, 6501205, 6MSB, 6MSBG, 916-3360, 916-4060, 916C3360F, 916C4720F, 16C5150F, 916C5980F, 916C6840F, 934T2620F, 934T2630F, 934T2920F, 935C2080F, AHA63224A34, AHA63226064, AHA63226218, AHA63226234, BT.00603.048, BT.00607.023, BT.00607.027, MA1 3S2P, MA6 3S2P, QCD1BT1ZZZTAV4, QCD1BTIZZZTAV4, QND1BT1ZZZTAV4, QND1BTIZZZ00T5, QND1BTIZZZ00V0, QND1BTIZZZ00Y4, QND1BTIZZZTAV4, SQU-413, SQU-414, SQU-415, SQU-516
Bay Valley Parts 6-Cell 11.1V 4800mAh New Replacement Laptop Battery for Gateway 103926, 106214, 106868, 1533557, 3UR18650F-2-QC-MA1, 3UR18650F-2-QC-MA6, 3UR18650F-2-QC224, 6500948, 6500996, 6501053, 6501054, 6501055, 6501117, 6501128, 6501130, 6501142, 6501147, 6501193, 6501194, 501195, 6501205, 6MSB, 6MSBG, 916-3360, 916-4060, 916C3360F, 916C4720F, 16C5150F, 916C5980F, 916C6840F, 934T2620F, 934T2630F, 934T2920F, 935C2080F, AHA63224A34, AHA63226064, AHA63226218, AHA63226234, BT.00603.048, BT.00607.023, BT.00607.027, MA1 3S2P, MA6 3S2P, QCD1BT1ZZZTAV4, QCD1BTIZZZTAV4, QND1BT1ZZZTAV4, QND1BTIZZZ00T5, QND1BTIZZZ00V0, QND1BTIZZZ00Y4, QND1BTIZZZTAV4, SQU-413, SQU-414, SQU-415, SQU-516
$18.99
Safety & Excellence Features:
* No memory effect, fast charge
* Low power consumption IC design
* Fully compatible with the original laptops (models listed below)
* Tested with strict quality control standards
* Over-charge protection
* Over-discharge protection
* Over-heat protection
* Over-current protection
* Short-circuit protection
* High capacity circulatory function

Compatible with …

2 Pcs Black Plastic Battery Holder Case w Wire for 4 x 18650 14.8V
2 Pcs Black Plastic Battery Holder Case w Wire for 4 x 18650 14.8V
$6.70
This battery box holder with wire connector, fit for 4 x 18650 14.8V batteries.With spring clip design, you can easily to put the battery in it.Battery is not included here. …

Two Panasonic NCR18650B 3.7V 3400mAh Rechargeable Li-ion Batteries QTY 2
Two Panasonic NCR18650B 3.7V 3400mAh Rechargeable Li-ion Batteries QTY 2
$15.92
2x Panasonic NCR18650B Li-ion Batteries The Panasonic NCR18650B is the highest capacity 18650 Li-ion cell currently on the market. These are brand new, never used cells from fresh stock. Please note that generally speaking bare Li-ion cells should not be used without proper protection circuitry. These are BARE, industrial cells, and do not have a protection circuit….
Two Panasonic NCR18650B 3.7V 3400mAh Rechargeable Li-ion Batteries (made-in-China)
Two Panasonic NCR18650B 3.7V 3400mAh Rechargeable Li-ion Batteries (made-in-China)
$17.99
2x Panasonic NCR18650B Li-ion Batteries The Panasonic NCR18650B is the highest capacity 18650 Li-ion cell currently on the market. These are brand new, never used cells from fresh stock. Please note that generally speaking bare Li-ion cells should not be used without proper protection circuitry. These are BARE, industrial cells, and do not have a protection circuit. These cells are manufactured by…
EBL® UT-2110D Universal LCD Rapid Smart Charger for AA, AAA, C Cell, D Cell, 9V Ni-MH / Ni-Cd Rechargeable Batteries, 18650, 26650, 22650, 18490, 18350, 17670, 17500, 17335, 16340(CR123A), 14500, 10440 3.7V Cylindrical Li-ion Batteries And 3.2V LiFePO4 Rechargeable Batteries
EBL® UT-2110D Universal LCD Rapid Smart Charger for AA, AAA, C Cell, D Cell, 9V Ni-MH / Ni-Cd Rechargeable Batteries, 18650, 26650, 22650, 18490, 18350, 17670, 17500, 17335, 16340(CR123A), 14500, 10440 3.7V Cylindrical Li-ion Batteries And 3.2V LiFePO4 Rechargeable Batteries
$25.99
Super Universal: Can charge for different types’batteries: AA,AAA,C,D,9V,18650,26650 Rechargeable Batteries. Worldwide Volage: Accepts input voltages ranging from AC 100-240V 50/60Hz 0.3A MAX, can be used all over the world Multiple DC Output Voltage: Output : DC 12V/1000mA 4 x (1.2V Ni-MH/Ni-Cd AA/AAA/C/D rechargeable batteries: 400mA) 4 x (3.2V/3.6V/3.7V rechargeable Li-ion batteries: 400mA) 1…

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