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
|Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
Rechargeable Lithium batteries are rapidly becoming a very economical way to lower the operating costs of Lithium-Powered flashlights.
|2 Pcs Black Plastic Battery Holder Case w Wire for 4 x 18650 14.8V
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. ...
|LB1 High Performance New Battery for Gateway 4UR18650F-2-QC-TA1 Laptop Notebook Computer PC [8-Cell 14.8V] 18 Months Warranty
When you need a Replacement Gateway 4UR18650F-2-QC-TA1 battery for your PC laptop or notebook computer, you need the power of LB1 High Performance batteries. It is the most cost effective and long lasting laptop batteries available on the market today. Compatible models:Gateway M280, M280E, M285, M285E, M295, CX200, CX200S, CX200X, CX210, CX210S, CX210X, CX2600, CX2608, CX2610, CX2615, CX2618, CX2...
|ATC 8 Cell New Replacement Battery for Gateway AHAC4322018, SQU-515, 2TA6BTLI607, 2TA1BTLI603, 916C4790F, 6500983, 4UR18650F-2-QC-TA1, 2TA1BTLI808, AHA84226004 Laptop/Notebook
Safety & Excellence Features:
* No memory effect, fast charge
* Low power consumption IC design
* Fully compatible with the original laptops (models listed below)
* Tested with strict quality control standards
* Over-charge protection
* Over-discharge protection
* Over-heat protection
* Over-current protection
* Short-circuit protection
* High capacity circulatory function
Compatible with ...
|10Pcs Dual Wired Rectangle 3 x 3.7V 18650 Battery Holder Case Cell Box
for 3 x 3.7V 18650 battery.Please pay attention to the Specification Table before purchasing, make sure our product is right what you want.Battery is not included here....
|3Pcs Double Wire Rectangle 4 x 3.7V 18650 Battery Holder Case Cell Box
for 4 x 3.7V 18650 battery. Please pay attention to the Specification Table before purchasing, make sure our product is right what you want. Battery is not included here. ...
|VP1 Battery Charger (Display built in- 3 Speeds) and Two 3400mAh Protected 18650 (Panasonic NCR18650B cell inside) Orbtronic Li-ion Rechargeable Batteries
More about batteries - Protection: Over-current (Activated @ 10A-12A), Over-charge (Activated @ 4.35V) - Over-discharge (Activated @ 2.5V) - Over-temp. and DUAL short circuit protection (External, and Internal).Protection circuit designed by Seiko. ICs made in Japan. --- Battery cell: NCR18650B, Capacity (Ah): 3.4 Ah (3400mAh), Charging Voltage (V): 4.2 V, Energy (Wh): 12.2 Wh, Energy Density (Wh/...
Incoming search terms:
- 18650 battery from walmart
- 18650 Battery Walmart
- 18650 battery