CONCEPTBRICK

Thank you. These are fair observations, and I would like to clarify the design choices. Regarding the form factor, the 5 × 11 footprint and approximately one-stud-thick body were chosen for models where low height is more important than footprint—for example, beneath a floor, beside a chassis or within other shallow spaces. This shape will not be ideal for every model, and other form factors may be considered for future energy modules. You are also correct about the connectors. The battery body itself is approximately one stud thick, but each right-angle connector requires about one additional stud of local clearance. This does not make the complete battery two studs thick everywhere, because the connector can sometimes be positioned within otherwise unused space in the model, but it does require planning. https://conceptbrick.com/wp-content/uploads/2026/08/FynoriX1511_positioned-within-otherwise-unused-space1.png https://conceptbrick.com/wp-content/uploads/2026/08/FynoriX1511_positioned-within-otherwise-unused-space2.png https://conceptbrick.com/wp-content/uploads/2026/08/FynoriX1511_positioned-within-otherwise-unused-space3-rotated.jpg InfiLinX was designed primarily to support distributed placement of multiple thin modules rather than creating a flush vertical battery tower. One cable is required for each additional module. In a multi-module FynoriX1511 configuration, the output of P3 connects to the input of P2, the output of P2 connects to the input of P1, and the PF output from P1 is used as the main system output. The modules may be installed in different available spaces throughout the model. Regarding the residual voltage, it is not an intentional feature intended to keep a motor turning after the module has been switched off. The FynoriX1511 power button disables the regulated 9 V circuit, but the current output architecture does not completely isolate the internal cell from the PF output. Complete isolation would require additional switching components, board space and circuit complexity within the 7.8 mm enclosure. The broader output-control architecture was selected partly to avoid unwanted no-load shutdown during normal operation. Some power-management circuits enter sleep mode when no load is detected, which can require the user to reactivate the power source after the model has remained idle. However, once FynoriX1511 is switched off, the remaining low voltage is simply a consequence of the circuit architecture—it is not a sleep-prevention function in the switched-off state. The storage concern is understandable, but the presence of residual voltage should be distinguished from continuous power consumption. It is similar to the open-circuit voltage of a battery cell: the voltage can be detected with a meter, and a connected load can draw current from it. However, if no load is connected, no external current flows and the residual voltage does not by itself continuously deliver energy through the PF output. As with all rechargeable lithium batteries, FynoriX1511 will still self-discharge slowly over time. For long-term storage, we recommend disconnecting the PF Output Cable and any connected load, and periodically recharging the module in accordance with the product instructions. These limitations are documented, but this discussion shows that the connector clearance, distributed installation concept and long-term storage recommendations should be illustrated more clearly. Thank you for raising these points. Independent real-world testing by forum members will provide additional practical information about where this form factor works well and where a different configuration may be more suitable.

Thank you very much, Thorsten. I really appreciate your comments. We believe it is important to present both the performance data and the product’s limitations clearly. Just one clarification: FynoriX1511 is not a prototype. It is the current production version and is already shipping. Feedback from independent real-world testing will help guide future improvements and products. Thank you again for your encouragement.

Hi everyone, Yong from CONCEPTBRICK here. First, thank you to @Jim for starting this topic, and thank you to everyone who has offered to test the FynoriX1511 or raised technical questions. Independent testing in real GBC, RC and Technic applications is very valuable to us. I would like to clarify a few of the points that have come up. Cell architecture and capacity @dr_spock — your second interpretation is correct. FynoriX1511 uses a single-cell architecture: 3.7 V nominal × 1,300 mAh ≈ 4,810 mWh An internal boost and regulation stage provides the regulated 9 V output. Therefore, the 4,810 mWh rating refers to the nominal stored energy of the internal cell. At 9 V, this is theoretically equivalent to approximately 534 mAh before conversion losses. For batteries operating at different voltages, Wh or mWh is the more useful comparison than mAh alone. Comparison with the original PF rechargeable box @Berthil — one important correction is that FynoriX1511 does not have four times the capacity of the original PF rechargeable battery box. Two FynoriX1511 modules provide approximately: 2 × 4.81 Wh = 9.62 Wh The commonly published nominal specification of the original 8878 rechargeable battery box is approximately: 7.4 V × 1.1 Ah = 8.14 Wh Two FynoriX1511 modules therefore provide slightly more nominal stored energy than a new 8878, not four or eight times more. However, your existing rechargeable battery boxes have already lost around half of their runtime, so the practical improvement compared with those aged units may be much more noticeable. Actual runtime should be determined through testing. Another difference is that the 8878 includes a speed-control dial, while FynoriX1511 is an independent energy module. It supplies regulated 9 V power but does not control motor speed or direction. If speed or direction control is required, a compatible PF switch, receiver or controller should be placed between FynoriX1511 and the motor. InfiLinX connection The modules are physically connected in a directional daisy chain through their dedicated InfiLinX IN and OUT ports, but they should not be understood as batteries connected electrically in series. Designate one FynoriX1511 as the main power module, identified as P1. Then build the chain toward P1: connect the InfiLinX OUT port of P2 to the InfiLinX IN port of P1; connect the InfiLinX OUT port of P3 to the InfiLinX IN port of P2; continue in the same manner for each additional module. For example: P3 [OUT] → [IN] P2 [OUT] → [IN] P1 P1 PF Output → Switch / Receiver / Controller → Motor or Load The InfiLinX IN and OUT ports are separate from the dedicated PF output. In this capacity-expansion configuration, only the FynoriX PF Output Cable connected to P1 is used as the main system output. When used with FynoriX1511, InfiLinX increases total available battery capacity and extends runtime while the main PF output remains regulated at 9 V. InfiLinX does not increase the peak power available from that PF output. It is also not a charging interface. The complete InfiLinX chain must be disconnected before charging, and each FynoriX1511 must be charged separately through its own USB-C port. A separate Multi-Battery Stacked PF Output configuration is documented for applications that require greater short-duration startup support. L and XL motor operation @2GodBDGlory — FynoriX1511 provides up to 1.7 A short-term peak current. This does not mean that it cannot operate L or XL motors. It can operate these motors in many normal-load applications. However, an L or XL motor under heavy load, aggressive gearing or near-stall conditions may briefly require substantially more current than during normal running. If the demand exceeds the supported range, the internal protection system may interrupt the output as intended. The result therefore depends on the complete model, including: model weight; motor quantity; friction; gearing; drivetrain efficiency; simultaneous motor startup; initial mechanical resistance. Motor type alone does not determine whether a particular configuration will operate reliably. For applications that naturally create greater short-duration startup demand, multiple compatible FynoriX1511 PF output connectors may be stacked directly together. This allows several modules to contribute to the same PF circuit while the regulated output voltage remains 9 V. The available current or power should not be assumed to increase linearly with the number of connected modules. Controllers, BuWizz and Powered Up FynoriX1511 is an energy module, not an RC receiver or motor controller. The intended system principle is: Energy Module → Controller → Motor or Electrical Load It may be used with compatible external PF receivers and controllers that are designed to accept a PF power source. @SNIPE — fitting into a model where an integrated battery/controller such as a BuWizz may be too large is one of the possible advantages of separating the energy module from the controller. However, an external compatible controller is still required when remote control is needed. @aFrInati0n — FynoriX1511 should not be connected to a BuWizz output or used as a BuWizz range extender. BuWizz already contains its own battery and control electronics, and two powered sources must never be electrically combined on the same PF circuit. FynoriX1511 is also not directly compatible with Powered Up or Control+ 6-pin devices. We do not recommend disassembling a Powered Up hub or making an undocumented custom power connection. Control and communication modules are part of the longer-term direction of the CONCEPTBRICK modular ecosystem, but we are not ready to announce specifications or a release schedule yet. Power Functions compatibility is only the starting point. Installation and power-off behaviour The 5 × 11 panel-compatible footprint and ten mounting holes allow FynoriX1511 to be positioned in compact areas, including low-floor models. However, the mounting holes are intended for positioning and secure installation. The module should be supported and protected by the surrounding structure. It should not be used as: an exposed skid plate; a primary load-bearing component; a structural replacement for a Technic panel. The power button disables the regulated 9 V circuit but does not completely isolate the output electrically. A small residual voltage may remain at the PF output. As a result, a motor connected directly to FynoriX1511 may rotate slowly while the module is switched off. This is a normal operating characteristic rather than a fault. For predictable control, connect FynoriX1511 to a compatible PF switch, receiver or controller first, then connect the motor or electrical load after that controlled component. Thank you again to everyone interested in testing it. @Jim and I are coordinating the review samples, and honest measurements and observations—including any limitations—are welcome. More information is available here: FynoriX1511 Engineering Guide: https://conceptbrick.com/fynorix1511-engineering-guide/ I will continue following this topic and will be happy to answer further technical questions. Best regards, Yong CONCEPTBRICK

Hi Jim, I hope you’re doing well. I tried to follow up with you by private message about the FynoriX1511 battery sets we discussed earlier, but I haven’t heard back yet. Could you please check your inbox when convenient? Thanks again!

@Milan Hello, since I wasn’t able to send you a private message, I’m leaving a note here. I have some business cooperation requests and would like to discuss them with you in detail. Could you please share a way to contact you?

@Milan How should I place a video to showcase my work?

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