Wait...this thread is STILL ALIVE?! And people are...trying to build replicas?
I think the only boost converter here is a defibrillator on this topic...
Uhh, no... You need to re-think that
Adding anything more than an ultra-thin tab for connection to the bottom of the battery is going to increase the total length. The only place that any circuitry can possibly go to minimize the added length is around the button at the top.
If you add, say, 1mm worth of PCB and components to the top of the battery, around the nipple, you still have to add the nipple on top of this, to make contact with the battery holder terminal, this nipple needs to extend the same height off the PCB as the original did off the battery, or you're guaranteeing it won't even make contact in a lot of battery holders...
The end result is no different to adding a 1mm thick PCB to the bottom of the battery....
If you add, say, 1mm worth of PCB and components to the top of the battery, around the nipple, you still have to add the nipple on top of this, to make contact with the battery holder terminal, this nipple needs to extend the same height off the PCB as the original did off the battery, or you're guaranteeing it won't even make contact in a lot of battery holders...
The end result is no different to adding a 1mm thick PCB to the bottom of the battery....
There is a difference.
Not all battery holders have a space restriction around the positive cap and for those, this is available space. On the other hand, the negative end has no such space and anything placed there will affect every battery compartment.
In fact, by putting it on the nipple end, you're creating empty space under the new positive terminal, as it has to be raised off the board.
In fact, by putting it on the nipple end, you're creating empty space under the new positive terminal, as it has to be raised off the board.
That positive contact needs only be thick enough to carry the required current - and to have a thickness of insulation between it and the battery cap sufficient to isolate. That will be able to be rather thin. Mechanical strength will come from the surrounding board.
At the negative end, the bottom of the battery occupies the entire area, so any circuitry must have a clearly larger impact on overall length.
Would it be out of line to point out that the Batteriser - after so much 'development' - has a design which follows this logic?
Alkaline cells generally have the seal at the base so a base mounted boost board wouldn't need a sleeve to connect to the other terminal of the cell, it would just need the user to notch the cell jacket where it covers the bottom corner so the board could contact the cathode terminal.
Also the terminals are generally plated steel so the boost board could be held in place magnetically.
or it won't make contact in 90% of devices!
Alkaline cells generally have the seal at the base so a base mounted boost board wouldn't need a sleeve to connect to the other terminal of the cell, it would just need the user to notch the cell jacket where it covers the bottom corner so the board could contact the cathode terminal.
Also the terminals are generally plated steel so the boost board could be held in place magnetically.
OK - let me just clarify the differentiation I was trying to make....
In regards to this statement:or it won't make contact in 90% of devices!Don't know about 90% - but I'll use that figure....
If 90% have a space problem at the positive terminal, 100% will have a space problem at the negative. So there is a difference. Whether that difference translates into any material issue is another question - and one that Batteroo can have.
FWIW my mouse has a space problem with both.
What are you even trying to argue?
The battery will be extended by the same amount, no matter what end you put the PCB on, because the positive terminal STILL has to be 1mm higher than the surface its protruding from, whether it be the battery itself, or the PCB.
Edit: if the battery compartment will accommodate the extra length at the positive terminal, you're not extending the battery length any more than this by having the PCB on the negative terminal!
What are you even trying to argue?
I think you'll find more devices with a recessed +ve contact to prevent a reversed cell connecting, that simply wont work with a booster that has a lower profile +ve terminal than the original cell, than you will find devices that don't have enough -ve contact spring compliance to accept the extra thickness of a slimline boost board.
Again - not always true.
Take this example:
The bulk of the space available for this particular battery compartment is the green area. The orange area will contain a top (+ve output) and bottom (+ve input) conductive layer separated by a layer of insulation. The orange area represents the increase in overall length.
I do not, nor have I ever said, that this is the case for all situations with the PCB at the positive end.
very few devices have a battery holder like that, so if thats what you're basing it on, you're more of an idiot than batteriser.
very few devices have a battery holder like that, so if thats what you're basing it on, you're more of an idiot than batteriser.
Insults aside.
You made a point that there is no difference. I showed you a case where there is. When you make absolute statements, be prepared to be challenged. When shown to be wrong, it does you no credit to spit the dummy.
It was a point of principle - not practicality.
Enough of this.
Let's just get back to the Batteroo show.....
Now you've forgotten your original claim.
You have changed your use of the word 'guarantee'.
Your original use may not be what you meant, but that's what I picked up on.