BTcap lithium ion hybrid supercapacitor

FyKnight

New Member
Hi I found these seemingly amazing 2200 mAh hybrid "capacitors" on Alibaba, called "BTcap 21700 Flash Charge Battery"

Does anyone have an opinions or experience with them? They'd be perfect for my solar-powered project that needs to output a few hundred watts for about a minute. Normally to do that you'd need a few hundred watt hours of battery to get the rate something near 1C. With these guys I just need 2 or 3 of them!

They have a continuous discharge rate of 60 A which is about 30C. Standard charge and discharge are great too at 22 A = 10C.
ESR is really small (11 mOhm), cycle life is huge (30k fast, 50k standard). Their self-discharge is even minimal compared to regular EDLC supercapacitors (see graphs). The voltage range (2.5 V to 4.2 V) is not too far off regular BMS kits.

So... what am I missing? What's the catch? Google can't find me anyone talking about them. Thanks!
 

FyKnight

New Member
My order came in last week and I'm going to test them this coming week. I actually received the 2500 mAh version, which is rated up to 70 A discharge. According to the (very friendly) supplier they have had a lot of interest in them. I'll post my results here if there's interest.
 

billw

New Member
My order came in last week and I'm going to test them this coming week. I actually received the 2500 mAh version, which is rated up to 70 A discharge. According to the (very friendly) supplier they have had a lot of interest in them. I'll post my results here if there's interest.
I'm really interested as I think I might be purchasing two 3.55 Sirius soon. Still waiting to hear from Sirius as to their components.
 

markheggie

New Member
My order came in last week and I'm going to test them this coming week. I actually received the 2500 mAh version, which is rated up to 70 A discharge. According to the (very friendly) supplier they have had a lot of interest in them. I'll post my results here if there's interest.
How did they perform? By my math they should be more like 250 mah not 2500-typical Chinese fake performance markup
 
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