while most of the time i would agree with you, that just simply isnt taking the facts about what we GET into play. and it also assumes that they have done things that are just not done.
there is no shunting of the power across a battery, even though there could be a post draining balancer, which is how one type of pack protection balancer curcuit works.
if you want to charge the battery at 7amps, be my guest, we learn great things from that, like when i learned that a saft D cell can shoot flames out of it very long distances , when charged at only 1C.
i just think that the idea of using a more volitile and dangerous battery should be done with at least the safety we have learnd from blowing up others. and some idea that a battery has magic protection balancer in it , WHEN they wont even do that with the rest of the stuff? ? sure they Squeese out a battery with some descent capacity today, and suddenly it has in it what no other cell has had before
in ya dreams
Well, the manufacturer
says it has it, and it's certainly not being sold at an unreasonably low price for a battery of this size and level of protection.
if you want to test that, then i hope you post your results, myself just learning from others and testing the smaller cells for the same reactions is sufficent. mabey we can get Plasmaman to sacrafice a few more for the team
Well, I might, because I'm quite sure it would work (though it may be hard on the batteries; I'm not quite sure I'm understanding right that the battery does stop at 4.19; it may be overcharged to 4.35), but I'm unlikely to, because to me the main application where charging all the cells at once is useful is the 10-20 AA hotwires, where individual charging and batteries become unwieldy. To me, dropping 4 D cells out of a Mag and charging separately every time, is easier than putting in a charging jack and making sure nothing gets in it when not charging.
But I probably will charge them at well over 1.75A, because the manufacturer has stated this is safe (reversing the misunderstanding of their earlier statements), and because it's actually useful. Results will be forthcoming.
uhh have you messed with zeners in this type of application? i find they are generally worthless cheap fix items, that blow power out for nothing usefull, and are only ever applied when making dump and run curcuitry. the zener came about as a BY-Product of a breaking diode
not as a regulation item. just because logs roll down a hill, doesnt mean we should try and make them wheels
In that type of application, meaning, to dump excess power?! No way! I said you
wouldn't do it that way; you'd use a zener, if at all, only as a voltage reference to control a transistor to dump the current for light overloads. They're good as voltage references, but it's imperative to keep the power (and hence the current) within specs, which are usually
quite low. Any use of them to directly dump energy is almost guaranteed to overheat and blow them; that was meant only conceptually.
i just think if were going to get some cheap cell that barly holds up its own voltage under load, is obviously agressivly high capacity which Generally means its NOT built like a tank or designed for high input-ouput, that we could use it within the logical paremeters of the item, and be happy that we HAVE a battery that is 3 times the capacity of a 18650 and can be used in place of a 18650, where all we had was AIR around a 18650, and limited capacity.
It's 3 times the capacity of an 18650, but it's also 3 times the
size of an 18650 -- it's not an amazingly high-capacity cell that should need to be babied. Again, it's rated for 12A discharge (1.6C); that's not out of line for the cells we're familiar with, which are often rated for 2C, but sometimes 1.5C. There's no reason I know to consider 1.75A (0.23C) charge rates "logical parameters", especially
after the manufacturer has clarified that the 1.75A limit only applies above 4.35V.
That we have the item that FITs the hole, and uses that hole for to achieve major capacity, but nooo, that isnt good enough , now we are going to try and stuff it in series, charge it in series, and fast charge it
whats next trying to get 50Watts out of it with a incan heater bulb?
why cant we just be happy with excessivly long runtime from a high capacity , NOT high load, battery?
Well, the series charge + balance, as I said, I probably won't try, as it doesn't offer much advantage, and I still have some doubts over whether it's "safe" (cells only reach 4.19V) or whether it just "works" (cells are overcharged to 4.35V, and don't vent at that overcharge). As for the fast charge, it's not a fast charge, IMHO; I thought the term "fast charge", for Li-ions, generally meant over 1C; going 0.3C isn't a fast charge, nor (since the manufacturer has stated they're good up to 5A charge) at all pushing things; recharging in 2 to 3 hours instead of 5+ seems like a good idea, as I don't like to charge unattended.
Pulling 50W? No, they rated it at 12A, so that's only 44.4W -- I'll probably keep it below 25W/cell, actually. Certainly I could use it for low-draw only, like a high-capacity 18650, and I may get a 1D Mag at some point to do just that with a P7, but since it has raised specs in other areas as well as capacity, why
shouldn't I use it for higher-performance applications
that remain within those specs?
Anyhow, supposing this deal goes down (and it looks promising!), I will post back with results, good or bad, of whatever stresses I put these poor batteries through.
so roll up roll up don't be shy.
