DNA20D Stealth Mod

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KILO68

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Madvapes has the 300g silver tact switches. If you'd rather have 200g, the part number is KSJ0M21180SHLFT.

Here's choices to buy...
KSJ0M21180SHLFT

can i ask, how do you attach then to the mod? they look like they are made for pcb installs? would you have a pic of how you've attached them?
 

jazon1

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Great looking mods mamu just be careful with those lipo's they are nothing i would want next to my face lol
had one go nuclear in my rc plane once while flying..burned right through the body of the plane and started a pretty nice fire i could hear the pop of the silver liner on the battery about 1/8 of a mile up. fantastic batterys tho other then the safety issues with them.
 

bapgood

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Great looking mods mamu just be careful with those lipo's they are nothing i would want next to my face lol
had one go nuclear in my rc plane once while flying..burned right through the body of the plane and started a pretty nice fire i could hear the pop of the silver liner on the battery about 1/8 of a mile up. fantastic batterys tho other then the safety issues with them.

I just want to dilute this a little bit. There is always a need to be carefull when using lipo's. However lipo's used in this application do not see nearly the current draw that lipo's used in RC do.

If you have a newer smart phone you likely put a lipo next to your face quite frequently.

Mamu is a very experienced modder and if you go through her vast library of builds you will see that she uses fuses and other means to keep the lipo's pretty safe.

All batteries have their potential hazards, especially lithium batteries. Even the protected round cells are not 100% safe.
 

jazon1

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glad to hear she uses some protection for the lipos bapgood would hate to see one pop on her.
ive never seen a lipo used in a cell phone i have seen people say they are lipo's because they are flat and look like lipos so they assume they are but all of mine have always been li-ion's even my S3 sitting here with me i just popped open to look and its a li-ion as well.
i thought they blocked the use of lipo's in most mobile devices a few years back after a few in laptops melt down when people were using them.
ether way her mods look fantastic i love how tiny this one looks:)
 

bapgood

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glad to hear she uses some protection for the lipos bapgood would hate to see one pop on her.
ive never seen a lipo used in a cell phone i have seen people say they are lipo's because they are flat and look like lipos so they assume they are but all of mine have always been li-ion's even my S3 sitting here with me i just popped open to look and its a li-ion as well.
i thought they blocked the use of lipo's in most mobile devices a few years back after a few in laptops melt down when people were using them.
ether way her mods look fantastic i love how tiny this one looks:)

The recalls were actually li-ion...here is some info Lithium-ion Safety Concerns – Battery University

Here is some great info from a great source Battery University.

The polymer hype of the early 2000s is still going strong, however, most users cannot distinguish between a regular Li-ion and one with polymer architecture. Lithium-polymer differs from other battery systems in the type of electrolyte used. The original polymer design dating back to the 1970s uses a solid (dry) polymer electrolyte that resembles a plastic-like film. This insulator allows the exchange of ions (electrically charged atoms) and replaces the traditional porous separator that is soaked with electrolyte. A solid polymer has a poor conductivity at room temperature and the battery must be heated to 50–60°C (122–140°F) to enable current flow.The much anticipated “true plastic battery” promised in the early 2000s did not materialize; the conductivity could not be attained at ambient temperature.

To make the modern Li-polymer battery conductive at room temperature, gelled electrolyte is added. All Li-ion polymer cells today incorporate a micro porous separator with moisture. The correct term is “Lithium-ion polymer” (Li-ion polymer or Li-polymer for short). Li-polymer can be built on many systems, such as Li-cobalt, NMC, Li-phosphate and Li-manganese. For this reason, Li-polymer is not considered a unique battery chemistry. Most Li-polymer packs for the consumer market are based on Li-cobalt.

With gelled electrolyte added, what then is the difference between a normal Li‑ion and Li‑ion polymer? As far as the user is concerned, the lithium polymer is essentially the same as the lithium-ion battery. Both use identical cathode and anode material and contain a similar amount of electrolyte. Although the characteristics and performance of the two systems are alike, the Li‑polymer is unique in that a micro porous electrolyte replaces the traditional porous separator. The gelled electrolyte becomes the catalyst that enhances the electrical conductivity. Li-polymer offers slightly higher specific energy and can be made thinner than conventional Li-ion, but the manufacturing cost increases by 10–30 percent. Despite the cost disadvantage, the market share of Li-polymer is growing.

Li-polymer cells also come in a flexible foil-type case (polymer laminate or pouch cell) that resembles a food package. While a standard Li-ion needs a rigid case to press the electrodes together, Li-polymer uses laminated sheets that do not need compression. A foil-type enclosure reduces the weight by more than 20 percent over the classic hard shell. Furthermore, thin film technology liberates the format design and the battery can be made into any shape, fitting neatly into stylish cell phones and laptops to make them smaller, thinner and lighter. Li-polymer can be made very slim to resemble a credit card. Read about the Pouch Cell.

Charge and discharge characteristics of Li-polymer are identical to other Li-ion systems and do not require a special charger. Safety issues are also similar in that protection circuits are needed. Gas buildup during charge can cause some Li-polymer in a foil package to swell, and equipment manufacturers must make allowances for expansion. Li-polymer in a foil package may be less durable than Li-ion in the cylindrical package. Li-polymer is not limited to a foil package and can also be made into a cylindrical design.
 

retird

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Great post ... bag..... my li-po's are foil packaged w/ plastic cover flat batts.....haven't noticed any swelling while charging at 500mA.....mine are in a tight package (mod)......so I will be monitoring after reading this:

Gas buildup during charge can cause some Li-polymer in a foil package to swell, and equipment manufacturers must make allowances for expansion.
 

Boognish

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I did another version - one with all black buttons. I prefer the black bigger fire button for front and center, but like the all silver buttons look better. And I've been outvoted by my kids and BG to do the all silver, smaller buttons version. People just gots no love for my beefy fire buttons. :laugh:

dsm01.jpg

I LOVE the all black version. This is my dream mod. Wish I could own one. You are truly talented:toast:
 

westy78

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Don't have any pics. I simply drill a 13/64" hole and press fit into place, then epoxy.

Is there any way to make provision for replacement in case a button fails? I've been thinking about this for my own mod and haven't been able to come up with anything yet.

Thanks for the links to the 200g switches... I've been looking all over for those!
 
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mamu

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DNA20D mod for my son for his birthday. I used an Eclipse tin - torched the paint off, scrubbed in warm soapy water using a scotchbrite pad, then torched again.

small - stealth worthy. :toast:

aluminum case. :toast:

dual 1200mAh 25C lipo batts (2400mAh 60A). :toast:

eclipse1.jpg


eclipse2.jpg


eclipse3.jpg


eclipse5.jpg


Size comparison with the 9v batt box... the Eclipse tin is 1/4" taller and 1/4" wider than the 9v batt box...
eclipse6.jpg
 

bapgood

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Dang mamu i want a peek up your skirt ;)....I just got one of these and none of my flat lipo batteries will really work that great unless I go with a couple of 800mah....I'm guessing yours is pretty tight.

Looks like an 18650 might just squeeze in there with a little massaging, but I'm kind of over the round cells, but then again I do have them....decisions decisions
 

mamu

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Dang mamu i want a peek up your skirt ;)....

oh really? :laugh:

The 2 lipo batts in parallel are a snug fit, but not too bad and even with a bit of room left over for the fuses and wiring.

There's 3 types of 1200mAh lipos that are very similar in size - the generic Walkera 1200mAh 25C, E-Fly 1200mAh 20C (has the shortest height), and Storm 1200mAh 25C and then there's the 1200mAh 15C Turnigy nano-tech. These lipo batts will fit. There's also ZOP Power 1100mAh 20C that will fit if you want to go down a bit in mAh.

I don't know if someone with fat fingers or fat knuckles will be able to work with this tin. The atty connector, usb charging board, and fire button were a bugaboo to position and epoxy in place as I had to reach up in there with my finger to do it. I think long tweezers would be helpful but I didn't have any.

eclipse7.jpg
 
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