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.

.

[5 min project]Charging 18650 battery with old mobile phone

...

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)
$53.99
...
FlePow 2 Pack 18650 2600mAh 3.7V Rechargeable Li-ion Batteries(Button Top) with Universal Smart Li-ion Battery Charger for 18650, 18500, 14500, RCR123A and Most 3.6V / 3.7V Rechargeable Lithium-ion Batteries
FlePow 2 Pack 18650 2600mAh 3.7V Rechargeable Li-ion Batteries(Button Top) with Universal Smart Li-ion Battery Charger for 18650, 18500, 14500, RCR123A and Most 3.6V / 3.7V Rechargeable Lithium-ion Batteries
$24.99
From the Manufacture

Charger:

FlePow smart Li-ion charger delivers advanced individual cell charging capabilities, 2 independent charging channels, full protection for short circuit and reserve polarity, only charge for Li-ion batteries

Battery:

FlePow 18650 Li-ion batteries has 2600mAh high capacity, no memory effect, come pre-charged and ready to use(only 30%-40% of full capacity), w...

1Pcs Battery Case Box Holder For 2x 18650 Batteries Cell In Parallel For Arduino
1Pcs Battery Case Box Holder For 2x 18650 Batteries Cell In Parallel For Arduino
$4.09
Great for arduino or other diy power supply work...
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)
$5.29
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 4 x 18650 14.8V
2 Pcs Black Plastic Battery Holder Case w Wire for 4 x 18650 14.8V
$6.77
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. ...
KMAX-812 4400mAh Rechargeable Backup External Battery Pack Charger with built-in 2.5W Torch Flashlight for iPhone 5/4S/4/3GS/3G, all iPhone, iPad 1/2/3/4 Mini, iPod Touch models; Android Smart phones: Samsung Galaxy S4/S3/S2 S III I9300 I9500, Galaxy S2 S II I9100, Galaxy Nexus, Galaxy Note II / HTC Sensation, One X, One S, Thunderbolt, EVO / Nokia N9 lumia 900 800 / Motorola Triumph, Droid 3 X X2 Bionic Razr; PS Vita; GoPro; and More Mobile Devices
KMAX-812 4400mAh Rechargeable Backup External Battery Pack Charger with built-in 2.5W Torch Flashlight for iPhone 5/4S/4/3GS/3G, all iPhone, iPad 1/2/3/4 Mini, iPod Touch models; Android Smart phones: Samsung Galaxy S4/S3/S2 S III I9300 I9500, Galaxy S2 S II I9100, Galaxy Nexus, Galaxy Note II / HTC Sensation, One X, One S, Thunderbolt, EVO / Nokia N9 lumia 900 800 / Motorola Triumph, Droid 3 X X2 Bionic Razr; PS Vita; GoPro; and More Mobile Devices

The KMASHI external battery comes with one USB ports (5V/1A) which can be used to charge your smart mobile phone, MP3, MP4, PSP, or any other mobile digital products. Easily recharge the KMASHI external battery with the Micro USB cable.

Features
- Capacity: 4400mAh
- Metal shell anti-shock
- 1 year limited warranty
- Comes with built-in LED portable flashlight torch.
- Battery can support over 7...

...

Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
Intsun® 2pcs 3.7V 18650 4000mah Rechargeable Li-ion Battery with PCB and 18650 battery Charger for LED Flashlight, Headlamps, search light lamp, etc
$79.99
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.
* With overcharge / discharge protection function that you can use it without worry.
* Can be used in laser pointer, Led Flashlights, Headlamps and other electron...

...


Incoming search terms:

  • 18650 battery from walmart
  • 18650 Battery Walmart
  • 18650 battery