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

18650 3800mAh 3.7V Li-ion Rechargeable battery cell UltraFire For Torch x 6 pcs
18650 3800mAh 3.7V Li-ion Rechargeable battery cell UltraFire For Torch x 6 pcs
$13.13

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….

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)
$5.88
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…

Gateway 3UR18650F-3-QC-UA2 Laptop Battery - Premium Powerwarehouse Battery 9 Cell
Gateway 3UR18650F-3-QC-UA2 Laptop Battery – Premium Powerwarehouse Battery 9 Cell
$62.00
Gateway 3UR18650F-3-QC-UA2 Laptop Battery – Premium Powerwarehouse Battery 9 Cell. Guaranteed to be 100% compatible with the original equipment, 1 year replacement warranty on all batteries….
Bay Valley Parts 6-Cell 10.8V 4800mAh New Replacement Laptop Battery for ACER: 3ICR18-65-2,3ICR19/66-2,3INR18/65-2,3UR18650-2-T0627,A7BTA020F,AK.006BT.082,AS01B41,AS10B31,AS10B3E,AS10B41,AS10B51,AS10B5E,AS10B61,AS10B6E,AS10B71,AS10B73,AS10B75,AS10E7E,AS2010B,B1001-2,BT.00603.110,BT.00603.116,BT.00604.048,BT.00605.061,BT.00605.063,BT.00606.007,BT.00606.009,BT.00606.010,BT.00607.122,BT.00607.123,BT.00607.124,BT.00607.128,BT.00607.129,CGR-B/6Q7,CGR-B/6Q7AE,LC.BTP01.029,LIP6297,LIP6297ACPC,LIP6297ACPC SY6,NCR-B/659,NCR-B/659AE
Bay Valley Parts 6-Cell 10.8V 4800mAh New Replacement Laptop Battery for ACER: 3ICR18-65-2,3ICR19/66-2,3INR18/65-2,3UR18650-2-T0627,A7BTA020F,AK.006BT.082,AS01B41,AS10B31,AS10B3E,AS10B41,AS10B51,AS10B5E,AS10B61,AS10B6E,AS10B71,AS10B73,AS10B75,AS10E7E,AS2010B,B1001-2,BT.00603.110,BT.00603.116,BT.00604.048,BT.00605.061,BT.00605.063,BT.00606.007,BT.00606.009,BT.00606.010,BT.00607.122,BT.00607.123,BT.00607.124,BT.00607.128,BT.00607.129,CGR-B/6Q7,CGR-B/6Q7AE,LC.BTP01.029,LIP6297,LIP6297ACPC,LIP6297ACPC SY6,NCR-B/659,NCR-B/659AE
$21.99

Safety & Excellence Features:
* No memory effect, fast charge
* Low power consumption IC design
* Over-charge/discharge/ heat/current protection
* Short-circuit protection
* High capacity circulatory function

Compatible with These Original Part Numbers:

ACER: 3ICR18-65-2,3ICR19/66-2,3INR18/65-2,3UR18650-2 T0627,A7BTA020F,AK.006BT.082,AS01B41,AS10B31,AS10B3E,AS10B41,AS10B51,AS10B5E,AS10B61,A…

Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
$2.26
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…

4pcs 18650 NCR18650A 3100mAh Rechargeable Li-ion battery 3.6V For Panasonic
4pcs 18650 NCR18650A 3100mAh Rechargeable Li-ion battery 3.6V For Panasonic
$23.83
InformationBrand:panasonicVoltage:3.6VCapacity:3100mAhRechargeable batteryMax charge current 0.7C 2ARecommend discharge current 1C 2.9ADischarge Termination Voltage: 2.5VSize 18.6mm x 65.2mmWeight : 45gMade in JapanWhat is in box?4 pcs Panasonic 18650 NCR18650A 3100mAh Rechargeable Li-ion battery…
2014 New Version Nitecore I2 Universal Intelligent Charger Black for two batteries Compatible With IMR / Li-ion 26650 22650 18650 18490 18350 17670 17500 17335 16340 RCR123 14500 10440 Ni-MH / Ni-Cd AA AAA AAAA C Designed for Top Safety in USE Fire Retardant Materials Intelligent Circuits Worldwide Insurance Input AC 100-240V 0.25A(Max) DC 12V 1A Output 4.2V / 1.48V 0.5A*2 Certified by ROHS CE FCC CEC and KC + East Shine EB182 Battery Box for 18650 17670 18350 18500 16340 RC123A RCR123A to Keep your battery Safe (2014 New I2 Charger)
2014 New Version Nitecore I2 Universal Intelligent Charger Black for two batteries Compatible With IMR / Li-ion 26650 22650 18650 18490 18350 17670 17500 17335 16340 RCR123 14500 10440 Ni-MH / Ni-Cd AA AAA AAAA C Designed for Top Safety in USE Fire Retardant Materials Intelligent Circuits Worldwide Insurance Input AC 100-240V 0.25A(Max) DC 12V 1A Output 4.2V / 1.48V 0.5A*2 Certified by ROHS CE FCC CEC and KC + East Shine EB182 Battery Box for 18650 17670 18350 18500 16340 RC123A RCR123A to Keep your battery Safe (2014 New I2 Charger)
$9.50
Specifications

Input: AC 100-240V 50/60Hz 0.35A(MAX) or DC 12V 1A
Output voltage: 4.2V ±1% / 1.48V ±1%
Output current: 375mA × 4 / 750mA × 2
Dimensions: 138mm × 95mm × 36mm
Weight: 184g (without batteries and power cord)
Compatible with:
Li-ion / IMR: 26650, 22650, 18650, 17670, 18490, 17500, 18350, 16340(RCR123), 14500, 10440
Ni-MH / Ni-Cd: AA, AAA, AAAA, C

Features

1.Capable of chargin…


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