Lionel Lauer: Learn how to read. He's right, you're wrong.
redtails: 3:26 Hope for you it won't last its rated spec, else you'll be eating those batteries!
TheCentralServices: And where is the Dilithium crystal?
Americanstu: Do you have to use the " labeled" 15 minute batteries with this charger or can you use the charger with any NiMH batteries? I have been using Eveready 2450 mAh with my Varta charger, which may be an earlier version of the one that you demo'd as it only has 1 LED per 2 batteries inserted however the LED will go on when only one battery is inserted...thank you for your post!
invertedlow: If you'd listened to one word he said, you'd have learned what you obviously don't get.
David Adams: You might want to watch again with your glasses on. His math is spot on. He didn't write 10C, he wrote C/10. That's 1/10th the charge rate, and 10 times as much time. A battery that has a C rate of 1 hour has a 4C rate of 15 minutes.
gramar tip: It's "albeit" not "all be it".
Eric Biyik: Hi Dave,
For an electronics guy your maths does really suck. If 1C is the carge rate per 1 hour and 10C is the charge rate for 10 hours then the charge rate for 15 minutes is 0.25C and not 4C as mentioned. Also the charge rate must be more than 0.25C as it doesn't charge all the batteries at once but pulses and cycles through each onecat a time, all be it, probably very quickly.
Charles McCune: and I thought I was the only Star gate SG1 fan lol
ilusjon: THUMBS UP, IF YOU GOT THE STARGATE SG1 REFRENCE !!!
victornpb: I'm gonna make a 5 minutes charger, to see if that bitch can handle 25amps. bang
victornpb: the rated capacity is for 25mAh discharge.
Chris Skoufis: LOL i really loved this comment :P
g6qwerty: I love all those shows his references came from :D
Ashot Gevorgian: A bit late ;-) However would like to share.
In 2008 I bought 15 minute rechargeable 2000mAh Ni-MH batteries from RadioShack labeled I-C3.
Back then, did some googling and, if not mistaken, those were custom produced
by Ray-O-Vac . However, everything is simpler here. Those batteries have an
internal pressure operated cut off mechanism, for the end of charge! No smart electronics.
If not mistaken, the gases produced at the high rate charge, create the necessary pressure.
I love EEVblog!
Lachlant1984: I have one of these battery chargers at work and generally I like it, the batteries do charge up in 15 minutes, but I like to leave mine on for a day at least to trickle charge the batteries properly. The batteries certainly do not hold their charge over a 12 month period, that's for sure.
Benjamin Hoppe: to much S.G.1.
fallen over: i have 2 arlec aa rechargable battery's (left) i have had for close to 25 years, they must have passed 1000 cycles by now easily and amazingly they still work as if i had just bought them
other then those, varta batterys are the best if have had since them (all others life is limited to a few months, to a year if lucky) but varta work good and hold charge, the chargers are cheap and nasty though, mine blew up, and now i cant find a replacement, not a 15 minute charger anyway
christo930: That isn't how these work. NIMH and NICAD batteries can accept very high charge rates up until they are about 80% charged, after that a great deal goes to heat. Since it's a charger designed to handle different battery capacities, it usually doesn't even know what the C rate is. It just dumps a lot of energy into the batteries until they get warm, then the charger backs down the current for the rest of the time. You will rarely get 4 2.1AH batteries fully charged in 15 minutes. More like 80-85%
edcjunkie: I love your sci fi references lol. You know, what may really suck is that IF 20 years down the road these batteries still work fine after 1000 cycles, you're going to have to eat that battery mate.
rocketman221projects: I don't know why they always say they can be recharged 1000 times. I have gone through a lot of AA & AAA nickel metal-hydrate batteries and I am lucky to get 80-100 cycles from them. That is using a microprocessor controlled charger that charges each cell individually at 500mA.
The timer based chargers get even less cycles because they almost always overcharge the batteries and usually charge in series to cause even more problems.
perlpower: Would you be able to do a "teardown" on that Tube based Bench Volt-Ohm meter you have on the top shelf? I'd love to learn about it.
NotSoLiberal: Where is the rest of the video?
Roy Cohen: Love the stargate references
cepaGMOD: Whoa whoa whoa whoa. Epic Stargate references.
NeMewSys4: So how can those batteries take so much current at charge?
Eddy Polonia: zpm haha
Terrence Kuchel: love the stargate ref
george456789: Would be nice to know the actual results like energy density after the 15 minute charge and the charge cycles. One issue with these chargers if you use standard NiMH batteries on this charger they gas electrolyte which destroys them quickly. The other thing is I'm not sure the formulas work out NiMH batteries have a typical charge efficiency of 65% so you need to ad 35% onto the numbers to allow for loss. Gotta go along with you tho with the 1000 cycles BS
FoamPackingPeanuts: The MCU is most likely a HT46R54A OTP EPROM microcontroller. I've got one in an Energizer 15 minute charger, but I had a Duracell one that used an Atmel ATmega8/L chip (which I accidentally erased with a programmer... oops.)
kildas: dilithium crystals, ZPM .... something tells me you are Sci-Fi fan :D
erlendmf: thumbs up for stargate refs
korizin: It would definitely decrease the cycle life of these batteries, batteries are fairly fragile with the amount of current pumping into them. I would be surprised if you got anywhere near 500 cycles out of them.
EEVblog: It's about wattage. The plugpack does not need to do 8.4A because of the internal DC-DC converter that generates a lower voltage at a higher current.
enliteneer: So to a charge a 2100mAh battery in 15 minutes (4C), why isn't the AC-DC plug pack adapter rated at 8.4A? (Or more since it can do 4 batteries at once)
What's the model of this? I'd like to see how it price compares with the PowerEx C9000 or even the Battery Wizard that can recharge standard Alkaline batteries!
Oh, also, did you have to eat the battery? Were you thinking that the # of cycles would decrease the faster you charge it?
GerbilEssences: Madness? THIS IS VAAAAAARTA!!!
Mniilla: EAT THE BATTERY!!!
edcjunkie: LOL @ the stargate references! Classic Geekspeak!
Liu YueKun: Can I charge other branded NiMH batteries with it? Like the Sanyo Eneloop?
unilateralview: Great Video...good to see someone doing something they obviously enjoy.
analher: So is this better than the eneloop or la crosse charger? BTW energizer has a 15min charger too... aka Blaze
theripper7675: great video Chopper reid
renxula: I lolled at the goa'uld reference :D
nigeleyeit: checkout the Powerex brand, i use the imedion ones 2400mah retains 85% charge upto 1 year, insane! I also use the MH-C9000 battery charger and found it very good, Does temperate sensing, delta v and timer cutoff and charges each battery independently. Might be another review idea?
roadrunnersrock57: is he on crack?
8minutestorm: thanks Dave!
EEVblog: Well, it works. Just don't expect the number of cycles claimed I recon.
ProblemsChild4eva: MEANS?? is this varta 15mins batt rechargeble good or bad ?? wanted to get 1 for my rc toys.
NosferatuD: Haha, love the di-lithium crystal comment.
theripper7675: gotta go duracell baby
gRis1cz: Dave, if I recall correctly, the 15 minute charge time is just a marketing trick. The charger only charges the batteries to about 80 percent in 15 minutes, it then lessens the current so as not to damage the battery. It's still quite a feat thoug.