Durable Laptop Batteries
EEVblog #35 – Inside the Varta 15 minute NiMH Battery Charger
Dave cracks open the Varta 15 minute NiMH battery charger, what will he find?
120%+ SUPER BATTERY LIFE! Buy Durable Laptop Batteries at LaptopBatteryLife.com
to? much S.G.1.
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
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%
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.
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.
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.
Where is the rest of the video??
Love the stargate references ?
Whoa whoa whoa whoa. Epic? Stargate references.
Dafuq i just heard referense? to Stargate
So how can those batteries take so much current at? charge?
zpm haha?
love the stargate ref?
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
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.)
dilithium crystals, ZPM …. something tells me you are Sci-Fi fan
?
thumbs? up for stargate refs
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.
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.
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?
Madness? THIS? IS VAAAAAARTA!!!
EAT? THE BATTERY!!!
LOL @ the? stargate references! Classic Geekspeak!
Can? I charge other branded NiMH batteries with it? Like the Sanyo Eneloop?
Great Video…good to see someone doing something they? obviously enjoy.