Is your Pylontech battery no longer reaching 100% State of Charge (SOC)?
Do the SOC LEDs never fully illuminate, or is one battery consistently going into alarm while others remain healthy? These are common signs of cell imbalance — a problem we fix regularly, with at least two similar repairs each week.

This issue often arises during the winter months when low solar input and prolonged low SOC (around 20%) cause the internal cell voltages to drift. The passive balancing circuit in Pylontech batteries only activates above 88% SOC, meaning minor differences in internal resistance (IR) between cells can become amplified over time.

What’s Included:

✅ Balance cell voltages and calibrate SOC
✅ Check and verify BMS statistics
✅ Soak test in a live system across 2 full charge/discharge cycles
✅ Controlled discharge at 10A to low SOC
✅ Final charge to 100% SOC
✅ Diagnostic inspection
✅ Optional advice on cell replacement if required

Next Steps:

After purchase, we’ll contact you within 48 hours to arrange collection. Please ensure your battery is securely packed in the original box. If you no longer have the original box, let us know and we can arrange to have one sent out.  The cost for this service in the UK is £125 per battery with £15/each way shipping.  We will send you an invoice once the repair is complete and arrange return shipping.  If you prefer you can contact us via email at [email protected] and discuss your options first.

Customer Reviews:

Had your battery repaired or balanced by us? We’d love to hear how it’s performing now – your feedback helps others make informed decisions.

Even if you only reached out for advice and, through our guidance, identified an issue like swollen cells and went on to secure a warranty repair through Pylontech — we’re glad we could help. Please feel free to leave a review and let others know how our free advice supported you.

Your experience matters, whether we carried out the full service or simply pointed you in the right direction.