VBatty/VariCore 32700 7000/6500mAh 35A LiFePO₄ review

[Barkuti]

VBatty 32700 3.2V 7000mAh (Grey) review @ lygte-info.dk
Related discussion thread @ BudgetLightForum

Looks like one of the temp sensors was not correctly placed but, anyway, the 35A maximum continuous rating is plausible: at 30A cell reached +30°C over ambient temperature, with +34°C latent heat absolute maximum. Add ≈25°C ambient temperature and you get the idea.
You get a lot of battery for ludicrously little money, if you can make use of it. DIY crowd I guess.
It would be interesting to see some pulse discharge curves for this cell, some output voltage margin is available.

Cheers and have fun

 

[Robin Becker]

Thanks for the link, but frankly speaking...why should any one use such a big cylindrical cell in LiFePo4.
Many of the manufacturer of LiFePo4 are offering Moduls of LiFePo4 in a so-called Pouch.

If I need lots of capacity with LiFePo4, I would always prefer such sulotions

 

[mimöschen]

Not enough voltage at acceptable ampdraws for vaping.
Meh.

 

[bombastinator]

Not enough voltage at acceptable ampdraws for vaping.
Meh.

I was thinking marginal, but yeah. The thing would be pulsing all the time and using power very inefficiently.

 

[Barkuti]

Fellows, came here to provide trustworthy information, and whether you like it or not it always empowers you.
This is ideal for a custom DIY “mod”, very much like when it all started with mods made out of modified flashlights. The flatness of the discharge curve means you can use nearly all of its capacity and energy from start to end, with up to 75 or 80W for this cell. This is nice, and plenty of runtime.
Versus a li-ion build coil resistance needs to be adjusted to ≈75% of its value for the same power.
Yes, I belong to the DIY crowd.

A properly designed mechanical mod would feature an electronic switch via MOSFETs, and of course overcurrent protection.
If you were to like some of these ideas or concepts, or any other innovative one, get the idea together with interested people in a thread for a group buy where you can attract a manufacturer by a combination of units and target price (which translates into potential benefit). Once an accord is reached money is gathered and the stuff (a new mod, for example) is manufactured and sent to customers. I've seen this more than once in BLF with flashlights which have ended up being consumer products designed by consumers and experts.
And if you were to do this, tell whatever manufacturer to avoid cutting corners after the first runs, corners are beautiful and useful.

Cheers

 

[Robin Becker]

With its 141 Gramms you can carry almost 3 x 18650 batteries and 2 x 21700. Maybe can be used in a mech mod a special design for Body Builders