Heltec Energy outlines battery health testing process for lithium packs

Chengdu Heltec Energy Technology Co., Ltd. detailed a step-by-step method for assessing lithium battery health, including visual checks, capacity testing, and internal resistance measurements. The guidance is aimed at helping operators decide when to keep, balance, repair, repurpose or replace battery packs instead of scrapping them early.

Why it matters: - Battery health checks can determine whether a lithium pack still has usable capacity or has reached the end of its service life. - Structured testing can reduce premature scrapping, cut maintenance waste and lower the risk of failures in electric scooters and industrial energy systems. - Better diagnostics help operators decide when to repair, rebalance, repurpose or replace a battery pack.

What happened: - Chengdu Heltec Energy Technology Co., Ltd. published a battery-assessment workflow for lithium packs. - The process uses a high-precision battery capacity tester to measure pack performance before a replacement decision is made. - The company said the method is designed to remove guesswork from maintenance and improve safety and longevity. - More information is available in the company's announcement.

The details: - The first step is a visual inspection for swelling, electrolyte leakage and terminal corrosion. - Technicians then check open-circuit voltage after the pack has remained idle. - A large voltage drop below the cutoff threshold can indicate deep discharge damage. - An open-circuit voltage differential above 100 millivolts between individual cell strings is an early warning sign of severe cell divergence. - The next step is controlled charge and discharge testing against nominal cell specifications. - The battery capacity tester records ampere-hour output and charge-discharge curves in real time. - Packs at 80% or more of nominal capacity are considered highly viable for primary use. - For those packs, active balancing hardware is recommended to slow future cell divergence. - Packs between 60% and 80% capacity with persistent voltage imbalance may have mismatch issues rather than complete chemical failure. - Those packs should be tested with the HT-CJ32S25A lithium battery equalizer and analyzer before a second capacity check. - Packs below roughly 60% to 70% of nominal capacity are considered past their best service limits for demanding use. - Those packs may be moved to secondary stationary storage or replaced. - The workflow also uses alternating current internal resistance testing to identify structural degradation. - An internal resistance variance above 20% between cell strings, or a sudden spike in one cell, can indicate grid corrosion or separator wear. - High internal resistance can cause heat buildup and voltage drops under heavy load. - The final decision depends on both capacity and resistance results. - Good capacity and uniform resistance point to continued deployment, often with active balancing added as preventative maintenance. - Marginal capacity with high voltage divergence calls for targeted balancing and cell rejuvenation. - Severe capacity loss or wide resistance dispersion means the affected strings or the full pack should be replaced or reassigned to lighter-duty storage uses.

Between the lines: - The guidance reflects a broader shift in battery maintenance from visual judgment to data-based diagnosis. - The workflow also separates reversible imbalance from irreversible degradation, which can extend pack life when only some cells are weak. - The emphasis on secondary storage suggests that some aging packs still have value even when they are no longer suitable for high-demand applications.

What's next: - Service centers are expected to use the testing sequence to standardize maintenance decisions. - Heltec Energy says technical teams can review equipment specifications and submit inquiries through its platform for diagnostic hardware and active balancers. - Wider adoption of the method could reduce replacement demand and extend the usable life of lithium battery assets.

The bottom line: - The central message is simple: measure battery capacity and internal resistance before replacing a lithium pack.