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 8-Cell 5200mAh Battery for Gateway AHA63224A69 916C4790F 4UR18650F-2-QC-TA1
New 8-Cell 5200mAh Battery for Gateway AHA63224A69 916C4790F 4UR18650F-2-QC-TA1
$28.69

Two 3400mAh PROTECTED 18650 Orbtronic (Panasonic NCR18650B cell inside) Li-ion Rechargeable Batteries, and Smart 3 speeds battery charger Kit (Latest Version)
Two 3400mAh PROTECTED 18650 Orbtronic (Panasonic NCR18650B cell inside) Li-ion Rechargeable Batteries, and Smart 3 speeds battery charger Kit (Latest Version)
$61.99

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…

2 Pcs Black Plastic Battery Holder Case w Wire for 2 x 18650 7.4V
2 Pcs Black Plastic Battery Holder Case w Wire for 2 x 18650 7.4V
$4.39
This battery box holder with wire connector, fit for 2 x 18650 7.4V batteries.With spring clip design, you can easily to put the battery in it.Battery is not included here. …
Bavvo 6-cell Laptop Battery for Gateway 103329 106229 3ur18650f-2-qc224 squ412, 11.1V
Bavvo 6-cell Laptop Battery for Gateway 103329 106229 3ur18650f-2-qc224 squ412, 11.1V
$19.99
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 103329 106229 3ur18650f-2-qc224 squ412…
Ultrafire 2pcs 3.7v 18650 3000mah Rechargeable Battery
Ultrafire 2pcs 3.7v 18650 3000mah Rechargeable Battery
$1.99
UltraFire 18650 rechargeable battery…
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
$2.76
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…

TWO PROTECTED 3100mAh 18650 (Industrial NCR18650A Panasonic Cell inside) Li-ion Rechargeable Orbtronic Battery Cells- DUAL Protection, Button Top, PCB- High Performance
TWO PROTECTED 3100mAh 18650 (Industrial NCR18650A Panasonic Cell inside) Li-ion Rechargeable Orbtronic Battery Cells- DUAL Protection, Button Top, PCB- High Performance
$27.99
3100mAh 18650 PROTECTED (High Performance NCR18650A Panasonic cell inside) Li-ion battery model with a REAL capacity tested > 3200mAh (see discharging chart above). Orbtronic 18650 battery cell will provide rock steady and safe operation. By using this powerful battery first thing you will notice is drastic increase in run time. Your flashlight will run smoothly with Orbtronic 3100mAh protected 18…
Ebest - New Nitecore Intelligent i4 18650 Li-ion/ Ni-MH/ Ni-CD Battery Charger
Ebest – New Nitecore Intelligent i4 18650 Li-ion/ Ni-MH/ Ni-CD Battery Charger
$22.00
Features: Capable of charging 4 batteries simultaneously Each of the four battery slots monitors and charges independently Automatically identifies Li-ion, Ni-MH and Ni-Cd rechargeable batteries Features three charging modes (CC, CV and Trickle Charge) Automatically detects battery status and selects the appropriate voltage and charge mode Three Color LED displays charging progress for each batter…

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