Coen said:
It is that simple. There are no 3100 mAh 18650 that offer anywhere near the discharge rates the 2600 mAh ones do. At high discharge rates the 3100 will also waste more on internal losses, making the nett usuable power you can extract from it at a high drain rate (near) equal or even below.
You also put too much emphasis on pack weight in the overheating characteristic. The higher internal resistance of 3100 mAh 18650's will cause more heat to be generated when emptied. So it at a low rate and this will not be a real factor. Do it at a high rate and they will suffer in capacity. So the packs with high-density cells are only really good for long duration low-drain applications, like battery lights. On any low-drain hand tool the size and weight is just a big downside, for high-drain they won't deliver anyway.
Sorry, but you are making generalized statements of fact without having even the anecdotal evidence to back them up. Yet you refer specific products.
I hate to be smug like this, but it is possibly warranted: Attempting to prove a negative is a very common mistake people fall for. There is a very good reason one of the first things pushed into a sciences student is that to disprove a negative it is sufficient to find just one scenario/object which does not align with a statement. This is why proving a negative is so difficult in logic, almost impossible outside mathematics, and disproving it is so easy.
https://en.wikipedia.org/wiki/Burden_of_proof_(philosophy)#Proving_a_negative
I have merely pointed that
there is nothing preventing FT to make the 6.2 packs be better than the 5.2 ones, or better than anyone else's on the market. It is a pure question of money, how much they are willing to pay. Also, such was also anecdotally confirmed on this same forum a couple yrs back.
Secondly that Festool
would have to try hard to botch up the 5.2 pack for it to be weaker than the 4.0 HP packs. They would per same have to *knowingly* screw customes with the 6.2. While the anecdotal evidence mentioned above is to the contrary - the 6.2 pack being observed stronger than the 5.2 ones. Elbeit that is with a sample of a few, while it naturally does not hard-refute your conjecture it puts it in serious jeopardy.
Or, please provide
factual evidence from controlled measurements to back youl statements. So far you presented only conjecture which was used to indirectly slander FT here. Effectively accusing FT as trying to "screw" customers with their, at peresent, most expensive pack.
There is a world of difference between "I suspect" and "I know".
All I know is this:
- all things being equal, my 5.2 packs provide more power under heavy load, than the 4.0 HP ones
- it is very much possible for Festool to make the 6.2 packs even stronger to the 5.2 ones, their price and anecdotal evidence even suggests so
I then proceeded to back up this observation by a theoretical calculation.
Overall, I stand by my recommendation that for a pro user, the 4.0 HP set a bad choice for TSC 55 and marginal for TSC 55 K.
For a hobby user, who can get by with a single 4.0 HP set for all his tools, the calculus may be different.
