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  1. #1
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    Apr 2010
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    Melbourne
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    69

    Why 905s are crap

    The 905 out of the box is crap - Part 1.

    Vaping Mechanics 101

    In basic terms, a device does two things - it holds batteries that provide voltage to a (in theory) matched atomiser and provide a switch to turn it on.

    The atomiser contains a heating coil. When turned on, the voltage from the device heats the coil in the atomiser and vaporises the water soluble liquid to produce steam containing nicotine. This is the vapour.

    Atomisers use different thickness heating coils to create different resistance. A thicker coil (higher resistance) doesn't heat as much, a thinner coil (lower resistance) heats more - but is more fragile. The heat is measured in wattage - much like a light globe.

    Wattage can be adjusted by matching different batteries (voltage) and different atomisers (resistance). Joules Law helps us calculate the outcome (wattage = voltage squared / resistance).

    From a vaping perspective, we're typically aiming for 6-10w depending on personal preference.

    905 Calculations

    The 905 uses a 3.7v 14500 battery and comes with 901 atomisers. These are typically 3.0-3.7ohm (resistance). My three from ecigz are 3.2ohms.

    Using Joules law (and ignoring the 0.2v drop when under load - thanks Mildew!) the best I can hope for with a 905 is 4.27w - well below what the optimum vapourising temp is. It's still vapable, but it feels like something is missing. This also explains the excess flooding that happens with the device.

    Fixing a 905

    As mentioned, you can tweak the wattage by changing the voltage (batteries) and the resistance (atomisers). A couple of quick fixes for the 905 are:

    1. Use Low Resistance (LR) atties. LR atties have their own issues (need to be kept wet, more fragile due to thinner coil, questionable life expectancy) - but a 1.7ohm atomiser (either a 510 LR atty with adaptor or a 901 LR atty) will boost the wattage up to a maximum 8.05w.

    2. Go to vaporosity and buy their handmade modded bottom for the 905. This will allow you to use 2 x CR2 rechargeable batteries and provide you with 6v (not 3.7v). Use this battery set up with a higher resistance 4.5ohm 510 HR atomiser (with a 901>510 adaptor) and you have 8w. Using the standard 901 atomisers (3.2ohm in my instance) give you 11.25w which will (in theory) burn some flavours.

  2. #2
    Member
    Join Date
    Apr 2010
    Location
    Melbourne
    Posts
    69

    Why 905s are crap

    The 905 out of the box is crap - Part 1.

    Vaping Mechanics 101

    In basic terms, a device does two things - it holds batteries that provide voltage to a (in theory) matched atomiser and provide a switch to turn it on.

    The atomiser contains a heating coil. When turned on, the voltage from the device heats the coil in the atomiser and vaporises the water soluble liquid to produce steam containing nicotine. This is the vapour.

    Atomisers use different thickness heating coils to create different resistance. A thicker coil (higher resistance) doesn't heat as much, a thinner coil (lower resistance) heats more - but is more fragile. The heat is measured in wattage - much like a light globe.

    Wattage can be adjusted by matching different batteries (voltage) and different atomisers (resistance). Joules Law helps us calculate the outcome (wattage = voltage squared / resistance).

    From a vaping perspective, we're typically aiming for 6-10w depending on personal preference.

    905 Calculations

    The 905 uses a 3.7v 14500 battery and comes with 901 atomisers. These are typically 3.0-3.7ohm (resistance). My three from ecigz are 3.2ohms.

    Using Joules law (and ignoring the 0.2v drop when under load - thanks Mildew!) the best I can hope for with a 905 is 4.27w - well below what the optimum vapourising temp is. It's still vapable, but it feels like something is missing. This also explains the excess flooding that happens with the device.

    Fixing a 905

    As mentioned, you can tweak the wattage by changing the voltage (batteries) and the resistance (atomisers). A couple of quick fixes for the 905 are:

    1. Use Low Resistance (LR) atties. LR atties have their own issues (need to be kept wet, more fragile due to thinner coil, questionable life expectancy) - but a 1.7ohm atomiser (either a 510 LR atty with adaptor or a 901 LR atty) will boost the wattage up to a maximum 8.05w.

    2. Go to vaporosity and buy their handmade modded bottom for the 905. This will allow you to use 2 x CR2 rechargeable batteries and provide you with 6v (not 3.7v). Use this battery set up with a higher resistance 4.5ohm 510 HR atomiser (with a 901>510 adaptor) and you have 8w. Using the standard 901 atomisers (3.2ohm in my instance) give you 11.25w which will (in theory) burn some flavours.

  3. #3
    Member
    Join Date
    Apr 2010
    Location
    Melbourne
    Posts
    69

    Re: Why 905s are crap

    The 905 is crap - Part 2.

    Electrical fault

    I mentioned earlier there are two reasons why the 905 is crap. The second is an electrical fault in the device itself. When the automatic cut-out is triggered, the entire body becomes live. This means the atomiser (and drip tip if you're using one) also carries current and results in a slight voltage hit.

    I've personally tested this on 3 units, and all had the same problem. dBN and others have reported similar findings. Similar posts have appeared overseas, which suggests this problem may be a design flaw, not localised to a specific batch.

    3.7v is not enough for most people to feel through the skin, but you can definitely feel it on your lips when using a drip tip or stove piping (using the atty only). If you're using the 901 plastic cartridge (mouthpiece) that ships with the 905, it's unlikely you'll feel it.

    Testing your unit

    An easy way to test this on your 905 is to stove pipe. Naturally, if you're susceptible to small electrical volt hits, don't do this.

    Remove the cart and drop 3-4 drips directly onto the atomiser to keep it wet during the test. Hold the button on for 10 seconds until the automatic cut-off kicks in, and then release it. As soon as the led stops flashing, turn it back on and put your wet lip on the atty. You should feel a slight flicker. That flicker is 3.7v.

    What does it mean?

    Well apart from it meaning the unit is crap, it means you shouldn't use the device for drip tips - which is disappointing. You pay a premium for a supposedly better device, only to learn that you're more restricted due to poor construction or poor design.

    The only justification I can think of to buy a 905 would be to gain a low cost entry into the world of 6v (with the mod from vaporosity).

    ---------------------------------------------
    UPDATE > Please be aware that this was written pre-delrin drip tips. If you have this device and want to drip - try the delrin (plastic) tips. You will still get a voltage hit from the atty, but at least it won't be constant like metal drip tips were/are.

  4. #4
    Member
    Join Date
    Apr 2010
    Location
    Melbourne
    Posts
    69

    Re: Why 905s are crap

    The 905 is crap - Part 2.

    Electrical fault

    I mentioned earlier there are two reasons why the 905 is crap. The second is an electrical fault in the device itself. When the automatic cut-out is triggered, the entire body becomes live. This means the atomiser (and drip tip if you're using one) also carries current and results in a slight voltage hit.

    I've personally tested this on 3 units, and all had the same problem. dBN and others have reported similar findings. Similar posts have appeared overseas, which suggests this problem may be a design flaw, not localised to a specific batch.

    3.7v is not enough for most people to feel through the skin, but you can definitely feel it on your lips when using a drip tip or stove piping (using the atty only). If you're using the 901 plastic cartridge (mouthpiece) that ships with the 905, it's unlikely you'll feel it.

    Testing your unit

    An easy way to test this on your 905 is to stove pipe. Naturally, if you're susceptible to small electrical volt hits, don't do this.

    Remove the cart and drop 3-4 drips directly onto the atomiser to keep it wet during the test. Hold the button on for 10 seconds until the automatic cut-off kicks in, and then release it. As soon as the led stops flashing, turn it back on and put your wet lip on the atty. You should feel a slight flicker. That flicker is 3.7v.

    What does it mean?

    Well apart from it meaning the unit is crap, it means you shouldn't use the device for drip tips - which is disappointing. You pay a premium for a supposedly better device, only to learn that you're more restricted due to poor construction or poor design.

    The only justification I can think of to buy a 905 would be to gain a low cost entry into the world of 6v (with the mod from vaporosity).

    ---------------------------------------------
    UPDATE > Please be aware that this was written pre-delrin drip tips. If you have this device and want to drip - try the delrin (plastic) tips. You will still get a voltage hit from the atty, but at least it won't be constant like metal drip tips were/are.

  5. #5
    Member
    Join Date
    May 2010
    Location
    Brisbane, QLD
    Posts
    91

    Re: Why 905s are crap

    I really liked my 905 for the first week. I now have that current you're talking about constantly every time I vape running through my hand and lips and it's getting frustrating and uncomfortable. One of the Batteries that came with the unit died after a week and it seems hit and miss with my other battery. It will vape well sometimes for 1 minute or so and then majority of the time I can inhale like crazy for over 10 secs and get no throat hit and minimal vapour. I really hope Its only the battery because as I said it worked great for the first week. Has anybody else had similar issues?

    I've ordered some new cr 14500 from DX so I have no idea when they will arrive. Does anybody know where I can pick these up locally?

  6. #6
    Member
    Join Date
    May 2010
    Location
    Brisbane, QLD
    Posts
    91

    Re: Why 905s are crap

    I really liked my 905 for the first week. I now have that current you're talking about constantly every time I vape running through my hand and lips and it's getting frustrating and uncomfortable. One of the Batteries that came with the unit died after a week and it seems hit and miss with my other battery. It will vape well sometimes for 1 minute or so and then majority of the time I can inhale like crazy for over 10 secs and get no throat hit and minimal vapour. I really hope Its only the battery because as I said it worked great for the first week. Has anybody else had similar issues?

    I've ordered some new cr 14500 from DX so I have no idea when they will arrive. Does anybody know where I can pick these up locally?

  7. #7
    AVF Newbie | Be nice to me
    Join Date
    May 2010
    Posts
    77

    Re: Why 905s are crap

    Nice write up and words of warning, Din. Sounds like a pretty sketchy device alright.

    Quote Originally Posted by jesseb05
    I've ordered some new cr 14500 from DX so I have no idea when they will arrive. Does anybody know where I can pick these up locally?
    kimmyw pointed me to this place a while back on ECF -- http://www.jpt-australia.com/batteries_rechargeable.htm . I've never ordered from there and can't vouch for service, but they seem to be based in Oz. Pricey compared to DX, but maybe worth a shot if you're in desperate need. Rechargable Li-ion seem to be very hard to come by locally, probably due to the potential dangers from misusing them.

  8. #8
    AVF Newbie | Be nice to me
    Join Date
    May 2010
    Posts
    77

    Re: Why 905s are crap

    Nice write up and words of warning, Din. Sounds like a pretty sketchy device alright.

    Quote Originally Posted by jesseb05
    I've ordered some new cr 14500 from DX so I have no idea when they will arrive. Does anybody know where I can pick these up locally?
    kimmyw pointed me to this place a while back on ECF -- http://www.jpt-australia.com/batteries_rechargeable.htm . I've never ordered from there and can't vouch for service, but they seem to be based in Oz. Pricey compared to DX, but maybe worth a shot if you're in desperate need. Rechargable Li-ion seem to be very hard to come by locally, probably due to the potential dangers from misusing them.

  9. #9
    Senior Member
    Join Date
    May 2010
    Location
    Sydney
    Posts
    138

    Re: Why 905s are crap

    Hi all,
    new on this forum, but vaping and posting on ecf since Nov 2008...I tend to lurk and learn, and post when necessary.
    I can certainly vouche for this guy. His name is Jason and he owns a small shop specialising in high power torches, batteries and outdoor stuff in S.W. Sydney (Carringbah). I've been there and purchased 14500's and a charger. His batteries are protected AW and trustfire and have lasted me for months. His prices are pretty good. I've also ordered over the phone with Jason using credit card details and delivery is 1-2 days to inner west Sydney.
    He's trying to get some protected 18350's for my SD2, not made by AW yet.

  10. #10
    Senior Member
    Join Date
    May 2010
    Location
    Sydney
    Posts
    138

    Re: Why 905s are crap

    Hi all,
    new on this forum, but vaping and posting on ecf since Nov 2008...I tend to lurk and learn, and post when necessary.
    I can certainly vouche for this guy. His name is Jason and he owns a small shop specialising in high power torches, batteries and outdoor stuff in S.W. Sydney (Carringbah). I've been there and purchased 14500's and a charger. His batteries are protected AW and trustfire and have lasted me for months. His prices are pretty good. I've also ordered over the phone with Jason using credit card details and delivery is 1-2 days to inner west Sydney.
    He's trying to get some protected 18350's for my SD2, not made by AW yet.

 

 
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