LiPo question (DNA 75 build)

[trickywoo]

Hi all,

Just wondering if anyone is able to give me any pointers on the following regarding a DNA75 build I am planning.

I am intending to wire the mod up as a parallel LiPo (I have experience with this from model aircraft) just wondering if I would need to add in a fuse between the lipo batts and the board in order to add an extra level of protection or is the totally unnecessary? - If I remember correctly this was advised with DNA 30/40 boards - is this still an issue?

Basically I am aiming to get to around 2-3000mah with the battery so I don't feel like I need to be aware of the nearest plug socket at all times!

If anyone could point me in the right direction I'd be eternally grateful!

 

[mc viper]

Thank you for your post! I'm planning to make a box with a lipo too...I didn't considered about a fuse! Now I surely put one on it, I think it's a very good idea!
I think it's more important to know the C rate of your batteries, but if it's a battery for a drone,for example, it could have the necessary C rate. A drone can also run with a more than 30C. Other thing,maybe it's better if you use a 2S pack for to have 7,4v. I know that a dna 200 requires an 3S pack for the 11,1v.

 

[mc viper]

For your purpose I suggest ,with 7,4v,a 15C rated battery,even if 10 could be enough. The higher the C rate,the fresher the battery remain.
For what about my purpose I think to use a graphene battery,65C in discharge,15C in charge.I know it's exxxagggerated, but I want that batteries stay iced cold in my wooden box!

 

[jock1092]

For your purpose I suggest ,with 7,4v,a 15C rated battery,even if 10 could be enough. The higher the C rate,the fresher the battery remain.
For what about my purpose I think to use a graphene battery,65C in discharge,15C in charge.I know it's exxxagggerated, but I want that batteries stay iced cold in my wooden box!

A dna75 will only work with 3.7v (4.2v full) as it's a single 18650 board.
You can use parallel 18650s or a lipo as long as it's not higher voltage.
Upside is parallel packs generally have a higher C rating
I've looked for a lipo to use for a dna75 as I intend to build one but most I've seen are long and thin or really high capacity but big all round making issues for a decent enclosure size

 

[mc viper]

Sorry, I thought it could also work with 7,4 ,two cell ,it seemed logical to me. I noticed that even at 40w a single battery is a little stressed...Better if I keep information before... Anyway, my board it's not a dna, it can also work with two serial cells ,7,4 v that it's better. Thank you for your suggestion.

 

[jock1092]

Sorry, I thought it could also work with 7,4 ,two cell ,it seemed logical to me. I noticed that even at 40w a single battery is a little stressed...Better if I keep information before... Anyway, my board it's not a dna, it can also work with two serial cells ,7,4 v that it's better. Thank you for your suggestion.

I've seen people use two batteries in parallel for the DNA75 to extend time between charges and reduce battery strain.
Then again with 20700/21700 batteries arriving that might be the easiest option