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

1* SANYO Li-ion 18650 11.1V 2600mAh Battery Pack 3cells to 3S1P With PCM & Plug
1* SANYO Li-ion 18650 11.1V 2600mAh Battery Pack 3cells to 3S1P With PCM & Plug
$30.95

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….
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
$6.69
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. …

EBL® UT-2110D LCD Universal Rapid Smart Charger for AA/AAA/C/D/9V/18650/26650 Rechargeable Batteries + 10000mAh Ni-MH Rechargeable D Batteries(4 Pack)
EBL® UT-2110D LCD Universal Rapid Smart Charger for AA/AAA/C/D/9V/18650/26650 Rechargeable Batteries + 10000mAh Ni-MH Rechargeable D Batteries(4 Pack)
$48.99
About Product:
EBL® UT-2110D Universal smart charger is multifunctional with the best available technology;
It could charge AA/AAA/C/D/ Ni-MH/Ni-CD rechargeable batteries,9V rechargeable battery and Cylindrical li-ion batteries ;
Individual timers aid in overcharge protection, with negative delta V (- ∆V) cut-off function (except for 9V batteries),with short circuit protection ,with non-recharg…
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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