Noticed these at 18650batterystore while doing some lunch time browsing. Had not seen anything on the forum about these.
Those are rated at a much higher capacity than other batteries of a similar format which would make me wary, and when taking into account the space lost to the built in charger they claim a much higher energy density than 3.7v 14500 li-ion batteries.
There are some EBL batteries on Amazon UK which have a similar capacity rating, 3300mWh but a couple of the reviews (1 star :D) state they only produce 1500-1700mWh on a discharge test, which would make more sense, i would assume the same for the Epoch batteries but having never tested them i can’t say for sure.
Yeah I had not seen the 1.5 volt lithium rechargeables until came across this but I guess there are others I see on Amazon.
They look similar to the Blackube ones that HKJ tested.
Not sure if the capacity claim is realistic.
I’ll be more skeptical, having owned a dozen Tenavolt for about a year. A voltage step down and charging + protection circuit needs to be put in that cylinder along with the actual battery. The Tenavolt max out about 1500mA, and they don’t have the extra room taken up by a USB charger.
So….if the claims are completely unrealistic, I give them a thumbs down on principal.
I guess it depends on the discharge current. Using 500mA discharge current, my Tenavolts have capacity of about 1750mA, and HKJ got similar results in his test:
Increasing discharge current will cause their capacity to take a dive, for sure.
Yeah, those Epoch capacity claims seem farfetched, for sure.
The Tenavolts have a 13430 3.7V 750mAh li-ion cell inside them. Not sure what these Epoch ones have inside, considering that the USB charging port takes up some of the space, as you pointed out.
Yes, amp draw makes a difference. I tend to use 0.5A for AA NiMh, and for these I used 1.0A and 1.5A. They start failing (overheating the converter) beyond 1.5A.
I have since gotten a dedicated dis-charger, not just a analyzing charger, but have not re-tested them. The dis-charger seems to be more accurate, or at least more consistently reliable, especially for IR.
Obviously, having a dozen of them, I like and use them regularly. I have a few applications they work quite well in. Long term reliability is yet to be seen, but the cells seem well made.