WattCycle App Parallel Discharge Repair and Dual-Mode Operation Guide

September 23, 2025
WattCycle App Parallel Discharge Repair

We have released an official Bluetooth App update that resolves the reported parallel “Take Turns” discharge issue and adds two parallel modes to the WattCycle App. This update improves reliability when batteries are used in parallel and makes mode selection clearer. The core changes are: device name display fixed, a parallel on/off control added to the App, and two selectable parallel modes: ExactMatch Mode and Compatibility Mode. Below is an WattCycle official guide to the update and correct usage.

Key updates at a glance

  • Device name display fixed. Each battery now shows its correct name in the App for easy identification.
  • Parallel on/off control added. Turn parallel operation on or off from the device settings.
  • Two parallel modes added: ExactMatch Mode and Compatibility Mode.
  • BMS over-current protection remains active in both modes and will protect the battery and connected equipment as needed.

Why we fixed the parallel-discharge issue

After user reports, we audited the App to BMS communication logic and corrected the interaction that could lead to alternating discharge behavior. The fix is included in this official versions. Please ensure your App and battery firmware are updated to the latest version before returning your system to production use.

Parallel modes and recommended use

ExactMatch Mode

Intended use: Parallel groups composed only of WattCycle batteries of the same voltage.

In this mode the App and BMS apply tuning that matches cell chemistry, internal resistance, and capacity so charge and discharge are coordinated across the battery bank, minimizing voltage and SOC (state-of-charge) divergence and improving balancing speed and thermal uniformity for LiFePO4 cells. For best performance and longest service life choose ExactMatch when every parallel unit is the same WattCycle battery. Standard BMS protections, including over-current protection, cell over-voltage and under-voltage protection, and low-temperature cutoff, still remain active in this mode.

Compatibility Mode

Intended use: Parallel combinations where WattCycle batteries are mixed with batteries from other brands or with different models and capacities.

This mode uses more conservative balancing thresholds and coordination logic to allow safe interoperability, so packs with differing characteristics can operate together with reduced risk of conflict; when there is a large mismatch in capacity or internal resistance the battery bank may show a brief delay between reaching full charge and the start of discharge, an uncommon effect that is usually negligible in normal use. Use Compatibility Mode only when mixing brands or models is necessary and monitor battery voltages and SOC regularly. As always BMS over-current and cell protection functions remain enabled to safeguard the system.

Safety and best practices

Before paralleling, confirm each battery is healthy and that voltages and state of charge are similar.

Prefer ExactMatch Mode for long term parallel use when all batteries are the same model.

If you must mix batteries, use Compatibility Mode and check battery bank behavior regularly. Avoid long term mixing of batteries with large capacity or health differences when possible.

BMS over-current protection will remain enabled and will act to protect the battery and connected loads in abnormal conditions.

If you experience any unexpected behavior after updating, please contact WattCycle support with your device model and serial number. We will continue to monitor feedback from this internal release and refine parallel handling as needed. Thank you for using WattCycle and for your help testing this update.

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Comments

  • Gerold Kalter 2026-07-16 13:23
    Finally… I got Parallel Exact Mode working. Lat year I had installed three 100 Ah BT batteries in parallel in a motorhome and since then I have been frustrated by the uneven discharge rates of the batteries. Yesterday I installed the latest version of the app and was initially frustrated again, because you’re supposed to scan the battery labels. Of course, these are installed deep inside the camper and would be a huge hassle to remove. But after a few attempts, I figured out that Parallel Mode can be activated even without scanning the serial numbers. Overnight, I ran my Thetford 4141 refrigerator on the batteries as a test. And lo and behold: the 18 amps were neatly divided among the three batteries, with each drawing about 6 amps. I hope this will now remain stable.
  • Briggs Pletcher 2026-06-30 23:34
    Three 314ah batteries in parallel. What is expected variation in discharge if app is in parallel mode with exact match? I’m seeing two @ 90% +/- and one at 100%. Is this within allowances? Can I force a reset once all are at 100% to improve cross battery drain?
  • Briggs Pletcher 2026-06-30 23:34
    Three 314ah batteries in parallel. What is expected variation in discharge if app is in parallel mode with exact match? I’m seeing two @ 90% +/- and one at 100%. Is this within allowances? Can I force a reset once all are at 100% to improve cross battery drain?
  • Jon Edwards 2026-06-06 09:36
    I have 4 new 12V314Ah mini smart batteries. All batteries are wired in a parallel configuration to make a 1256Ah 12V battery bank. I have set each of the batteries in the app to Parallel mode in the settings. However, I am seeing only one battery discharging in the bank with the others at full SOC and the app showing no current draw. Is this considered to be a normal behavior for the Parallel mode?
  • Sylvain Lavoie 2026-04-01 22:00
    The first battery is in parallel mode no problem. But when I try to do the other 3 batteries it says out of range ?
  • Michael Harrison 2026-03-02 21:45
    Have these issues been addressed? I just received two of the 314amp hour batteries and need to know if I am going to have issues. Thank you
  • Davide Muliere 2026-02-12 03:51
    Possiedo una wattcycle mini da 314ah. Dall app non mi fa disabilitare la ricarica.
  • Walt Morrison 2025-10-19 13:34
    Is there an application version for the latest update? where do you find it on an Android Phone?
  • Peter Parkes 2025-10-15 16:24
    Parallel mode not working on android app. In fact, factory reset and settings change not working either. Repeated “setup failure”.
  • David Moore 2025-09-29 23:27
    I updated the IOS app and set to parallel, the following morning I have a Pack OVP warning on one battery. I sent you an email already.
    I changed the batteries back out of parallel mode, I noticed that the setting parameters on the battery with the warning was changed. Max Charge Voltage(V) was changed from 14.6 to 13.9.
    I had no Idea this change would happen when going into parallel mode. Why did you not inform about this change? My multiples was set to 14.2 charge. I have changed it to 13.9 now.
    How do I get this one battery to unlock the warning Pack OVP so the battery will be functional?

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