Anker F3800 Battery Plug - Direct Access to Internal Battery

What if there was a way to tap straight into the core of a power station as versatile as the Anker F3800? To not only extend the runtime of the battery, but to merge with the battery itself - and gain direct access to the full potential of the system's 6000W inverter, 1800W AC charger, MPPT charge converters, etc... all without any major modifications nor the loss of any feature or functionality?

This connector is the result of my investigations into that possibility, which are documented in more detail across two YouTube videos. Unlikely as it may seem, Anker has put absolutely no effort into closing off their internal ecosystem beyond the proprietary connector which serves as its gateway. With this simple 3D-printed connector and some 5.5mm bullet connectors off of Amazon, you can tap into the onboard battery as if it were a regular 48V LiFePO4 battery!

Huge thanks to Juan Carlos Medina for sharing his mock-up of this connector! Saved me a lot of time taking dimensions and modeling from scratch.

To purchase a pre-built, pre-wired connector kit: Visit my website

5.5mm bullet connectors: Amazon - amazon.com/dp/B096DJKR5Y AliExpress - aliexpress.us/item/3256806214344734.html

Assembly: Solder main cables onto 5.5mm bullet connectors; insert into "base connector" (push until flush with rear cutout); secure "locks" over top using M3 screw/bolt (max 10mm, will thread into printed part tightly if tolerances are correct)

In my testing, I found there are virtually zero limitations or disadvantages, even despite the lack of communication through the central pins on the port. The only practical difference I've noticed is the icon that indicates the number of connected battery expansion packs does not light up either on-screen or in the app. My expectation was that the system would become confused due to unexpected current flow in/out of the port, resulting in inaccurate battery % and possibly early shut-downs or errors. But it appears the system measures thenet inflow / outflow of the system,including the battery port, and formulates it's % estimation based on that. So even if all your charging / discharging occurs through the battery port, the displayed % will still be accurate, despite the screen not explicitly showing the amount of watts in/out of the port. This applies for the app as well.

Assuming my testing was thorough enough, and Anker doesn't take action against it (yikes), it's hard to imagine how many possibilities such a loophole opens up. The base F3800 system offers such high value by itself - with this port, the F3800 may become the centerpiece of even hardcore DIY systems. It's certainly changed my paradigm.

[06/06/25]: I updated the model files to reflect a number of small tweaks I've made over the past few weeks to improve the strength, dimensional accuracy, and tolerances. The updated model looks ever so slightly different than the original photos.

[07/14/25]: Another update. I slightly improved the geometry that holds the bullet connectors in place. It is now a bit easier to print and results in a stronger and more consistent fitment.

VIDEOS:

An in-depth analysis and some fairly decisive testing.**Includes an overview of the 3D model and assembly instructions.**

My initial realization of this loophole's existence and some preliminary investigations.

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