First dna20d mod- few questions

[gavijal]

Hy! This will be my first dna20 mod and I have few question- If the answers are posted- sorry couldnt find them
I thought to go with Panasonic 3400mAh NCR18650B 3.7V Rechargeable 18650 not protected (do I need protected with dna20? ). What are disadvantages of that battery and of 18650 batteries over cellphone stile batteries in general?
What I purchase for now is dna20d chip, EVOLV dna 20D MICRO USB CHARGER BOARD, connestors Prewired 510 Battery Connector, Sealed, Silver 510 Sealed Battery Connector and case for batteries in case I will use 18650 2 Pcs Black 18650 Flat Tip Batteries Battery Holder Case w Wire Leads | eBay.
Did I bought something wrong at this stage?
Sorry, but English is not my mother language , so if I made some grammar mistakes dont shoot me

 

[Innocuous]

Mamu's Milo
Another DNA12 mod
Another DNA20 mod

Use the search feature - or google.

 

[gavijal]

Still cant find answer for batteries. Ok I read it again

 

[Innocuous]

afaik, "protected" would conflict the processor of the DNA20 (or 12) - so, no: use unprotected cells. However, the DNA20 can be killed by a reversed battery. You'll want to find Mamu's "reversed battery protection" thread for the DNA20 if you use a removable cell. If you are building it inside and charging from the USB, then this is unlikely to be an issue.

However, almost all the mods will install a small fuse, too. Read the threads, download the PDF's, read some more.

 

[ecat]

Panasonic 3400mAh NCR18650B http://shop.battex.cz/pdf/NCR18650B-D.pdf appears to be protected, at least the data sheet says it has an internal PTC. Lacking in the data sheet is any mention of 'Maximum Discharge Current', the highest the charts show is 6.5A (with about a 0.5V drop!) but without a specified number this may be misleading.

DNA20 specifies unprotected 7A max discharge current or better iirc. I think I would look to a different battery, maybe something like the CGR18650CH http://www.houseofbatteries.com/documents/cgr18650ch.pdf : 10A max discharge, unprotected and even though it is only 2.25Ah capacity maybe the (I assume) lower internal resistance will make up some of the deficit.

The flat style batteries also come in various combinations of capacity+discharge current and again it is important to chose one which at least satisfies the 7Ah requirement of the DNA20. The unprotected ones used in model aeroplanes are often specified for incredibly high discharge rates, 20A or 40A is not unusual, and in order to achieve this level of delivery they have a very low internal resistance.

Internal Resistance:
Think of this as a way of measuring the amount of power which is lost due to the chemistry and internal construction of the battery. It is much like having an extra resistor in your circuit that reduces the voltage and current available, converting the losses to heat.

 

[foggdawg]

I like the tactile switches and the large silver switch. I don't think I need to order them from Europe. Where can I pick up some of those switched here in the US?

 

[gavijal]

But it needs to be 3.7v right? And what that 25c,30c etc means?

 

[gavijal]

Is this overkill?? 5000mAh Turnigy Nanotech LiPo AKKU 1S 3 7V 50c Hardcase | eBay

 

[vewdew]

Is this overkill?? 5000mAh Turnigy Nanotech LiPo AKKU 1S 3 7V 50c Hardcase | eBay

Well if you want to hold your mod with 2 hands that's just fine" just kidding" , that's kinda big IMO. Battery size 93,2x47x18,5mm.

 

[vewdew]

You want something more or less like this smaller size 5X 3 7V 1000mAh 1200mAh 25c LiPo Battery RC Walkera Wklipo 5 10 5G4Q3 Syma S006 | eBay


this one is 62mm x 31mm x 8mm, or build your mod with a 18650 65x18mm Mah raging from 1800 all the way up to 3000 unprotected.

 

[gavijal]

Yea, thought to use 3 of them paralel

 

[ecat]

But it needs to be 3.7v right? And what that 25c,30c etc means?

Okay, lets use vewdew's link 5X 3 7V 1000mAh 1200mAh 25c LiPo Battery RC Walkera Wklipo 5 10 5G4Q3 Syma S006 | eBay as an example

1-cell Lithium Polymer Battery
Volt: 3.7V
Capacity: 1200mAh
Plug-type: JST
Maximum Continuous Discharge Rate:25C
Size :62mm x 31mm x 8mm
Weight : 28g
Temperatur: 0°~45°(charger); -20°~60°(discharger)
Charger Time: about 30 minutes

It is a LiPo battery so 3.7V is the nominal voltage (Max voltage is 4.2V, minimum usable voltage is around 3.3V), this is the same for all LiPo batteries.

It has a Capacity of 1200mAh, this is another way of writing 1.2Ah. The word Capacity is usually shortened to the letter C and is often used to specify the maximum charge current (eg 1C charge = 1.2A charge current) and also the discharge current which for this battery is 25C = 25 * 1.2 = 30A

It has a continuous Maximum Discharge Rate of 25C which equals 30A as shown above.

 

[gavijal]

Any1 knows some site with tactile switches/buttons - need brushed alu or something like that- not to deep? Ty

 

[gavijal]

Okay, lets use vewdew's link 5X 3 7V 1000mAh 1200mAh 25c LiPo Battery RC Walkera Wklipo 5 10 5G4Q3 Syma S006 | eBay as an example

1-cell Lithium Polymer Battery
Volt: 3.7V
Capacity: 1200mAh
Plug-type: JST
Maximum Continuous Discharge Rate:25C
Size :62mm x 31mm x 8mm
Weight : 28g
Temperatur: 0°~45°(charger); -20°~60°(discharger)
Charger Time: about 30 minutes

It is a LiPo battery so 3.7V is the nominal voltage (Max voltage is 4.2V, minimum usable voltage is around 3.3V), this is the same for all LiPo batteries.

It has a Capacity of 1200mAh, this is another way of writing 1.2Ah. The word Capacity is usually shortened to the letter C and is often used to specify the maximum charge current (eg 1C charge = 1.2A charge current) and also the discharge current which for this battery is 25C = 25 * 1.2 = 30A

It has a continuous Maximum Discharge Rate of 25C which equals 30A as shown above.

Ty m8-really helpful

 

[gavijal]

Is c15 enough?

 

[JX3P]

15C is ok ))
tactile microswitch on ebay too:
Tactile Switch with Round Actuator 300g for DNA20 D Evolv | eBay

 

[dr g]

Is c15 enough?

depends on the size of the battery

 

[gavijal]

For 1800 mah lipo

 

[gavijal]

15C is ok ))
tactile microswitch on ebay too:
Tactile Switch with Round Actuator 300g for DNA20 D Evolv | eBay

Ty. I look into that

 

[retird]

KSJ0M21180SHLFT | KSJ Series 7.62 x 5.08 mm 200 g Spherical Actuator Tactile Switch | C & K COMPONENTS - Future Electronics