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

Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
Panasonic CGR18650CG Rechargeable 3.6V Li-ion 18650 Battery 2250mAh, 3008
$4.99
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…

18650 Battery Charger Box With 4 Bay - Soshine E3 External Power Bank DIY Case with Display USB Output - Black
18650 Battery Charger Box With 4 Bay – Soshine E3 External Power Bank DIY Case with Display USB Output – Black
$19.97
Description: Tips:Power saving mode: about 10 seconds after the charger will automatically shut down if the charger is not any action.This is a DIY 18650 Mobile Power Bank. You can put 1 to 4 18650 batteries into the slot. Therefore, you can determine the capacity of the mobile power bank. Simply drop in 1 – 4 x 18650 batteries to make your own power bank (batteries not included) The battery charg…
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…

4Pcs Perman 3.7v 5800mAh 18650 Battery Li-ion Rechargeable Battery + Dual Smart Charger US
4Pcs Perman 3.7v 5800mAh 18650 Battery Li-ion Rechargeable Battery + Dual Smart Charger US
$9.99
WARNING: DO NOT dispose in fire or heat; DO NOT mix fresh batteries with used batteries DO NOT puncture,damage,and disassemble; Package Includes: 4pcs x 18650 3.7 Rechargeable Battery 1pcs x Dual Smart 18650 Battery Charger…
50pcs 18650 Lithium Battery Double Holder Bracket for DIY Battery Pack
50pcs 18650 Lithium Battery Double Holder Bracket for DIY Battery Pack
$11.61
18650 cylindrical battery holder, fire retardant pc+pp+gp materials; Crack resistant edge with the slot, with the firm, It can accomodate various size; Battery installation hole diameter 18mm, 2-linked structure, Nickel plate vibration test can be conducted without attachment to any device. Suitable for all types of battery assembly including do it option. Please note, installation requires t…
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
$4.42
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. …
uxcell 2 Pcs Plastic Light Blue White 18650 Battery Holder Protective Case
uxcell 2 Pcs Plastic Light Blue White 18650 Battery Holder Protective Case
$0.99
Each box can store pair 18650 model batteries.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…
Sunnice® 4Pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with 18650 battery Charger
Sunnice® 4Pcs 3.7V 18650 5000mah Rechargeable Lithium Battery with 18650 battery Charger
$10.99
Battery Specifications:

1. Cell type: Rechargeable 18650
2. Capacity: 5000mAh
3. Voltage: 3.7V
4. Material: Li-ion
5. Dimensions: 6.5 cm x 2 cm x 2 cm
6. Weight: 0.05 kg

Charge Specifications:

1. Input Voltage: 100V~240V 50/60Hz 150mAh MAX:150mA
2. Output Voltage: 4.2V
3. Output Current: 600mAh
4. Dimensions: 9 cm x 4 cm x 5 cm
5. Weight: 0.08 kg
6. Simultaneously c…


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