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

2Pcs Black Plastic Battery Holder Case Box w Wire for 3 x 18650 11.1V
2Pcs Black Plastic Battery Holder Case Box w Wire for 3 x 18650 11.1V
$3.64
This battery box holder with wire connector, fit for 3 x 18650 11.1V batteries.With spring clip design, you can easily to put the battery in it.Battery is not included here….
Mohoo 100 x Solder Tab for Sub C 14500 18650 AA Battery Cell SPCC
Mohoo 100 x Solder Tab for Sub C 14500 18650 AA Battery Cell SPCC
$5.92
Features: Suitable for: 18650 14500 AA Sub C battery Material: SPCC Color: Silver Weight: 15g (100 pcs) Size: 2.5 x 0.5cm (LxW) Package Contents: 100 x Solder Tab…
2x18650 Battery Cell Spacer Radiating Shell EV Pack Plastic Heat Holder 18.4 (4*5 hole)
2×18650 Battery Cell Spacer Radiating Shell EV Pack Plastic Heat Holder 18.4 (4*5 hole)
$5.99
This holder dia is 18.4mm
Due to different brand.the battery size have some difference, the following is some brand battery size.
LG-18650-2600 : 18.3±0.1 mm (Max 18.4 mm)
SAMSUNG ICR18650-26 2600mAh : MAX18.35mm
SANYO UR18650F 2200mAh: Max.18.1 mm

Note: It would be a bit hard to fully fit every spacer by hand, you may use a small hammer to slightly hit the slot for perfect fix.
The…

Battery Balance Charging PCB Board for 4 Pack DC3.6V LiFePO4 Cell Lithium 18650
Battery Balance Charging PCB Board for 4 Pack DC3.6V LiFePO4 Cell Lithium 18650
$6.89
Feature: This balancing board is suitable for non-balanced charging lithium batteries increased charge equalization function, so that each group of cells within the battery pack is fully charged simultaneously. Note:The balance board is without charging and discharging protection, not a substitute for the protection board, late charge in the battery, a fully charged battery for the first discharge…
uxcell 3 Pcs Black Battery Storage Box Holder for 3.7V 18650 Batteries
uxcell 3 Pcs Black Battery Storage Box Holder for 3.7V 18650 Batteries
$3.63
This battery box holder with wire connector, fit for 3.7V18650 batteries.With spring clip design, you can easily to put the battery in it.Battery is not included here. …
Two Wire Spring Clip 3 x 3.7V 18650 Cell Battery Holder Box Black 3pcs
Two Wire Spring Clip 3 x 3.7V 18650 Cell Battery Holder Box Black 3pcs
$7.81
This battery box holder with wire connector, fit for 3 x 3.7 V 18650 size batteries. With spring clip design, you can easily to put the battery in it. Battery is not included here. …
TFSeven® 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
TFSeven® 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
$49.99
•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. * Can be used in Led Flashlights, Headlamps and other electronic products. Battery Specifications: * Cell type: Rechargeable 18650 * Capacity: 4000mAh * Voltage: 3…
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
2pcs 18650 2500mah 20A discharge Samsung INR18650-25R li-ion power cell
$10.00
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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