# LiPo Enclosure

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#### TekcoR

##### Member
I want to find a secure enclosure I can use to attach a LiPo battery to a avionics sled. I can find plenty for 9V, but nothing for a 3.7V 900mPh. Any thoughts?

#### rharshberger

##### Well-Known Member
Design and 3D print one, Lipo batteries are not standardized to the point that batteries like 9V are. A 1S 900mah from one vendor may vary dramatically in any dimension from that by another vendor all based on cell configuration (flat, round, rectangular) and containment (soft or hard case).

#### TekcoR

##### Member
Wish I had a 3D printer. All my LiPos are for Altus Metrum GPS so are the same size. Do you know of anyone/company that will custom create?

#### rharshberger

##### Well-Known Member
There are several electronics sled vendors who might support them already Lab Rat Rocketry and SMT Designs rocketry are two that immediately come to mind. Additive Aerospace may well have one too.

#### Crazyrocket

##### Well-Known Member
Do you need an enclosure? I use zip ties and that works fine for all the different types of batteries that I use.

##### Well-Known Member
velcro and zip ties hold mine in place up to 4S 2200mAh. 1S 900mAh is still pretty small.

#### Arpak

##### Well-Known Member
Command strip and a zip tie for good measure?

#### MikeyDSlagle

##### Well-Known Member
Wish I had a 3D printer. All my LiPos are for Altus Metrum GPS so are the same size. Do you know of anyone/company that will custom create?
I can do you a custom enclosure. Give me some dimensions for your battery and specs on what you want, such as how you want it mounted, how big is the sled or bay etc. A picture of your battery will help too. I can do the whole dang sled if you want. Send me a PM/conversation and we can hash it out.

#### OverTheTop

##### Well-Known Member
TRF Supporter
I use Velcro and cable ties, like heada suggested. Works well.

#### JoePfeiffer

##### Well-Known Member
Another vote here for zip ties. For a while I was doing various enclosures, some made of wood and some 3D printed; zip ties work at least as well, are much easier, and let you visually inspect the cell.

#### nmartin

##### Well-Known Member
I use pallet tie straps around the lipo so I don't crush it, then secure the tie zip ties.

#### ghostfather

##### Well-Known Member
TRF Supporter
Do you need an enclosure? I use zip ties and that works fine for all the different types of batteries that I use.
For most of us, probably not, unless you are pulling some extreme G's. Because there is no "containment" on most lipo batteries, they can slump under high-G launches, making them look like a teabag, and shorting out.
Saw the results of a failed lipo at Black Rock one year (where there are some of the more powerful high-G flights), but luckily the backup used a standard 9v battery. Since then, I try to contain my lipos to prevent T-bagging.

#### nmartin

##### Well-Known Member
For most of us, probably not, unless you are pulling some extreme G's. Because there is no "containment" on most lipo batteries, they can slump under high-G launches, making them look like a teabag, and shorting out.
Saw the results of a failed lipo at Black Rock one year (where there are some of the more powerful high-G flights), but luckily the backup used a standard 9v battery. Since then, I try to contain my lipos to prevent T-bagging.

That's a great idea to have a 9 volt as a backup.

#### ghostfather

##### Well-Known Member
TRF Supporter
That's a great idea to have a 9 volt as a backup.
That's backup, as in dual electronics, one on a lipo, one on a 9v

#### nmartin

##### Well-Known Member
That's backup, as in dual electronics, one on a lipo, one on a 9v
I build backup in my eBay. Electronics from two different manufacturers. Completely isolated systems.

#### TekcoR

##### Member
That's backup, as in dual electronics, one on a lipo, one on a 9v
Actually I am using 2 9V for the altimeters. The LiPo is for the GPS as it can drain a 9V pretty quickly.

#### TekcoR

##### Member
That's backup, as in dual electronics, one on a lipo, one on a 9v
That's backup, as in dual electronics, one on a lipo, one on a 9v
I can do you a custom enclosure. Give me some dimensions for your battery and specs on what you want, such as how you want it mounted, how big is the sled or bay etc. A picture of your battery will help too. I can do the whole dang sled if you want. Send me a PM/conversation and we can hash it out.
I'll send some info later when I am not occupied by my day job. In the meantime, here is what the battery looks like,

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#### TekcoR

##### Member
I'll send some info later when I am not occupied by my day job. In the meantime, here is what the battery looks like,
So with a little wiggle room to account for variations, we are looking at an interior well of 51mm x 31mm x 6mm. I was thinking along the lines of this 9V enclosure that mounts to the sled. The sled itself is 5.5" x 12.25"

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#### caveduck

##### semi old rocketeer
My current method is some 3M VHB tape plus zipties if they seem warranted (higher acceleration or small surface area). Velcro works too but takes up a small bit more space. If I ever get to the point of flights that might deform a battery I'll put the batteries in a machined aluminum case or even a fully machined sled.

#### MikeyDSlagle

##### Well-Known Member
So with a little wiggle room to account for variations, we are looking at an interior well of 51mm x 31mm x 6mm. I was thinking along the lines of this 9V enclosure that mounts to the sled. The sled itself is 5.5" x 12.25"
Too easy.
I may get a chance this weekend to tinker something up in CAD.

#### MikeyDSlagle

##### Well-Known Member

Nothing fancy, lid is a simple flat plate.
The base and lid is 2.54mm thick
Sides are 2mm thick.
Inside dimensions are what you posted.

Added a step to the lid, should be a better fit.

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#### TekcoR

##### Member
It looks like it would do the trick. What would it cost to print it out?

#### MikeyDSlagle

##### Well-Known Member
5 bucks oughta do it. And add actual shipping charges, can't be too much. Unless you want priority of course.
How many you want?

#### TekcoR

##### Member
At $5 a pop, make me 4. I can send$30 to cover it all if you think that's enough with postage. If you email me at [email protected] I can give you my mailing address and also send you funds via PayPal if that is acceptable.

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