3.7 to 5v ?

Hello,

I have a device that has a power requirement of 5v, 1a. I wish to build a power source to make it portable.

I have several 3.7 lithium Ion 18650's. But I'm not sure if I should put them in series to make 11.4v then reduce down to 5v or paralle to 3.7 then boost up ?

Can anyone recommend a build sheet or video on this with parts list ?

Thank you. OT

Top Replies

genebren over 5 years ago +5

The boost concept is a solid approach for generating 5.0V from a Li-Ion battery. As John has pointed out there are a lot of available and cheap devices out there to do that. I have chosen to build my own…
jw0752 over 5 years ago +4

Hi Again OT, Here is a picture of one that I took apart to use in a similar fashion to what you describe. John
jw0752 over 5 years ago in reply to o.thornwall +4

Hi OT That is a good question. If your device is designed to run on 5 Volts and it draws 1 Amp yes you can obtain this from either a step up converter (called a boost converter) or from a step down converter…

Parents

genebren over 5 years ago

The boost concept is a solid approach for generating 5.0V from a Li-Ion battery. As John has pointed out there are a lot of available and cheap devices out there to do that. I have chosen to build my own. They are easy and affordable and you have a higher degree of flexibility in functionality build your own. Here are a couple of links to some of my designs.

Walky the Biped Robot - Power pack
Walky the Biped Robot - A new hope (actually a new body and battery)
Choosing the correct Inductor for a DC-DC step-up regulator - Part 2
Choosing the correct Inductor for a DC-DC step-up regulator - Part 3

Good luck!
Cancel
Vote Up +5 Vote Down

Sign in to reply

Cancel

Reply

genebren over 5 years ago

The boost concept is a solid approach for generating 5.0V from a Li-Ion battery. As John has pointed out there are a lot of available and cheap devices out there to do that. I have chosen to build my own. They are easy and affordable and you have a higher degree of flexibility in functionality build your own. Here are a couple of links to some of my designs.

Walky the Biped Robot - Power pack
Walky the Biped Robot - A new hope (actually a new body and battery)
Choosing the correct Inductor for a DC-DC step-up regulator - Part 2
Choosing the correct Inductor for a DC-DC step-up regulator - Part 3

Good luck!
Cancel
Vote Up +5 Vote Down

Sign in to reply

Cancel

Children

charlieo21 over 5 years ago in reply to genebren

I agree with the boost converter scenario. Using the batteries in parallel implies self balancing and that could help with their life cycle, also you can upgrade to more batteries to achieve longer capacity or less batteries to achieve a more compact design.
Cancel
Vote Up +2 Vote Down

Sign in to reply

Cancel