A couple of battery questions

[MattBott]

I'm looking into a pair of these batteries in parallel for a DNA 12 build. Having never used packs like this, I have a few questions.

1) Can I "stack" these two batteries on top of each other to save space?
2) Can I put the PC Board for the DNA on top of one as well? Maybe with the DNA being in some heat shrink tube it insulate it?

The idea is to make a passthrough box mod with most of a rebuildable atomizer tank inside, possibly in a sealed off section, then the batteries / chips in other.

I'm still in the planning phase of this, betting a parts list and sized together, etc.

 

[Java_Az]

Putting the batteries together and wiring in parallel would not be a problem. But these are Unprotected battery packs that require you to add a protection PCB. I would also heat shrink or tape the battery pack rather then the DNA module. Not sure how hot a DNA gets but it is usually a good idea to let regulators breathe a little. Closing one in with heat shrink could lead to heat issues.

 

[Commie]

Doesn't DNA12 act as a protection?

BTW, this is a question, not suggestion, please don't blow yourself up

 

[MattBott]

Doesn't DNA12 act as a protection?

BTW, this is a question, not suggestion, please don't blow yourself up

The only protection that the DNA has seems to be for the chip itself, not the battery, so I'll be getting the protection PCBs as well. The site seems to be down at the moment, so I can't check them out.

Protective features and error states​

In an error state, the red error LED will illuminate. All error indications will clear themselves once the
error is cleared.

Current limit:

The DNA 12 will shut down temporarily if the output current rises above 3.5 amps. This also
protects the unit from damage if the atomizer shorts out.​

Low battery:

To prevent battery damage, the DNA 12 will shut off if the battery voltage dips below 3.1 volts
(loaded) for more than .25 seconds.​

Overvoltage:

In the event an atomizer of too high resistance to allow the desired power setting is attached,
the output voltage will be limited to 6.0 volts.​

Overheat:

DNA 12 has a temperature sensor onboard. If the board temperature rises above 80C, the error
light will illuminate and the output will remain off until the board temperature drops.​

High resistance:

If the DNA 12 senses an output resistance of more than 10 ohms, it will assume there is no
atomizer connected and remain in a low power sleep state.​

 

[vsummer1]

Forgive me for hijacking your thread for a moment, but can you tell me if batteries are on top of each other, they are "stacked". Are they considered stacked if they are side by side in parallel?

 

[MattBott]

Sorry, I was using the term stacked as "physically on top of eachother." The batteries in the link are battery packs, like what's inside of the plastic of a cellphone or camera rechargeable battery. Normally in the mod world, when you are talking about "stacking batteries" it means to cylinder batteries on top of each other in series, -==+ -==+

Batteries in series will double the voltage and the other stats stay the same. Batteries in parallel will double the mAh, and the other stats will stay the same.

 

[MattBott]

So, sticking with the 2 batteries from my original post (Polymer Li-Ion Cell: 3.7V, 750mAh (603048-10C), 2.7Wh, 7.5A rate --- UL listed), will 2 of these protection circuits work? Protection Circuit Module (PCB) for 3.7V Li-Ion Battery (6.0A limit)

The specs on the battery page says it requires a Protection PCB to have:

4.2V/cell over-charge protection
2.5V/cell over-discharge protection
Max current over-drain protection
Short circuit protection.​

The Protection board has the specs of

Keep 3.7V Li-Ion Battery pack from overcharge beyond 4.30V +/-0.05V
Keep 3.7V Li-Ion Battery pack from over-discharge below 2.4V +/- 0.1V
Keep 3.7V Li-Ion Battery pack 's discharging current < 6.0A
Protect battery from short circuit and wrong polarity​

I know it doesn't exactly meet the demands, but the only other option on the site is this: Protection Circuit Module (PCB) for 3.7V Li-Ion Battery (8.0A limit) , which states, "If you want to use this pcm for a battery that is rated less than 10A drain, you must add additional protection device to protect the battery itself. Such as: proper rated polyswitch."

 

[Java_Az]

So, sticking with the 2 batteries from my original post (Polymer Li-Ion Cell: 3.7V, 750mAh (603048-10C), 2.7Wh, 7.5A rate --- UL listed), will 2 of these protection circuits work? Protection Circuit Module (PCB) for 3.7V Li-Ion Battery (6.0A limit)

The specs on the battery page says it requires a Protection PCB to have:

4.2V/cell over-charge protection
2.5V/cell over-discharge protection
Max current over-drain protection
Short circuit protection.​

The Protection board has the specs of

Keep 3.7V Li-Ion Battery pack from overcharge beyond 4.30V +/-0.05V
Keep 3.7V Li-Ion Battery pack from over-discharge below 2.4V +/- 0.1V
Keep 3.7V Li-Ion Battery pack 's discharging current < 6.0A
Protect battery from short circuit and wrong polarity​

I know it doesn't exactly meet the demands, but the only other option on the site is this: Protection Circuit Module (PCB) for 3.7V Li-Ion Battery (8.0A limit) , which states, "If you want to use this pcm for a battery that is rated less than 10A drain, you must add additional protection device to protect the battery itself. Such as: proper rated polyswitch."

The 6 amp would be more then enough. I doubt you will see much more then 3 to 3.5 amps with the DNA booster on the input side. I use that same protection PCB on my vv booster that can run up to 24 watts. The main thing your wanting by adding the PCB is the short circuit protection. So if by some fluke you got a short after the batteries /pcb it should keep the batteries from going terminal. It also adds a extra safety net for discharge voltage and over charging

 

[MattBott]

The 6 amp would be more then enough. I doubt you will see much more then 3 to 3.5 amps with the DNA booster on the input side. I use that same protection PCB on my vv booster that can run up to 24 watts. The main thing your wanting by adding the PCB is the short circuit protection. So if by some fluke you got a short after the batteries /pcb it should keep the batteries from going terminal. It also adds a extra safety net for discharge voltage and over charging

Thanks, Java_Az, that's exactly what I wanted to hear.

The DNA spec sheet says that it requires a battery with a minimum of 5 amps continuous discharge, hence the 7C battery and the 6C protection circuit.