Yes - confused re what point you’re making though?
The point re the 1000A is that what you really need is a sensible amperage along with a sensible time. Without a time specified, that battery could last 5 seconds or 5 hours - the latter being a huge one! 100 Amps requires quite thick connection leads (think here of your domestic wiring for just a 13A lead).
One really needs to know the time the battery will last at the typical amperage drawn, without the battery overheating.
Energy content is a far better way to express battery capacity, along with the maximum delivery in amps/Watts. See my post on Dec 28th 9the reply was referring to lead/acid battery types.
Dec 28, 2020
#16
a 12V 7Ah battery is 84Wh energy capacity - not all of which us available - unless you want to send your batteries to an early grave. Say 30% discharged only - that means only 30Wh is a sensibly usable.
If your heater uses 300W (doubtful as the varrox was only about 150W) would mean one fully charged battery (in ‘as new’ condition) would last just 6 minutes before needing to be recharged.
Just some simple physics - and simple maths to calculate it out. Does that help you make a decision?
The answer is no, if you want your batteries to last. Incidentally, automotive batteries (this includes motorcycles) are not manufactured to be discharged to any great extent as they will only last a very limited number of ‘full discharge cycle equivalents’. They are normally returned to full charge soon after operating the starter motor and power for ancillaries is derived from the automotive generator while the engine is running.
I think you need to investigate the power consumption/supply, as well as just the sublimox (and more about the sublimox than just source and price)
The way the cheap chinese Lithium batteries are rated is for the maximum hype. Cordless power tools are much more sensible and honest in their rating. A 2Ah x12V cordless screwdriver battery would last one hour @ 2A. That would be 24Wh (or 86.4kJoules [one Watt for one second is one Joule - the SI unit for energy]).
The current drawn to completely discharge the battery in one hour is designated as
C. Batteries (particularly lead/acid types will deliver far more energy if the discharge time is extended - like to 20 hours (when the discharge rate is then called the
C/20 rate).
To calculate what size battery you require is calculated from the current and time for each operation and how many operations required.
For Lithium cells, one needs to know the actual chemistry as well - eg LiPO cells (4.2V max) is different to LIFe PO4 cells (3.65V max). There are other chemistries. So 3S strings are good enough (just) for a 12V LiPO (under light load) but 4S is the usual for LiFePO4 cells. For heavier currents (or extra capacity), for a given cell size and battery voltage, one simply parallel the cells (or strings) to remain within the battery specification for maximum discharge rate for each cell. Again, those two chemistries have different maximum discharge rates for cells with the same dimensions - LiPO have a far higher discharge rate than LiFePO4.
Further complications apply while re-charging - power tool batteries are able to be recharged in about 20 minutes but cell prameters need to be carefully controlled to avoid problems (lifetime and prevention of fires).
I expect most, if not all of the cheap chinese options, suggested above, are inadequate in at least one parameter. Get it wrong and you waste your money or can cause a fire.
If that lot makes it clearer, good; if not, your vaping could turn out to be an expensive operation.
As an aside, I have three 5kWh (almost) LiPO batteries which are 14S with quite a few cells in parallel. One of them powers an inverter which easily delivers 2kW, at mains voltage, for a couple of hours. Each battery weighs 46kg.
