Regular monitoring of state-of-health (SOH) metrics is a core routine for teams that operate used lithium-ion forklift batteries, as accurate parameter reading helps avoid unexpected downtime, extend remaining service life, and cut overall operation costs for common material handling scenarios. Unlike lead-acid batteries that rely on simple voltage checks, lithium-ion forklift batteries store multi-layered SOH data in their built-in battery management system, and users need to follow standardized steps to extract and interpret these parameters correctly to get reliable reference results.

The first step of reading SOH metrics is to access the BMS data interface with a dedicated compliant reading tool, after the battery stays in static standby state for no less than 30 minutes to eliminate temporary data deviation caused by recent high-load discharging or fast charging. The first core metric to confirm is the actual available capacity ratio, which is presented as a percentage value comparing current maximum dischargeable capacity to the factory rated capacity, this value directly reflects the basic energy reserve condition of the used battery. Next, read the internal resistance metric, a stable low internal resistance value within the normal reference range indicates no severe aging of internal electrode materials, while a sudden sharp rise of the value usually points to potential degradation risks that need extra attention. The total completed charge-discharge cycle count is another basic SOH parameter, users can cross-reference this data with the battery’s known service history to make initial condition judgments.

After collecting these basic SOH parameters, you need to verify auxiliary associated metrics to avoid misjudgment caused by occasional data errors. Check the average voltage difference between single cells under full charge state, the value should stay within the preset allowable threshold range for normal used batteries, excessive unbalance will reduce the actual usable SOH performance even if the total capacity metric shows a satisfactory figure. You can also record the SOH data continuously for 3 to 5 full charge-discharge cycles, and take the average value of stable readings as the final reference, instead of relying on a single one-off reading that may be affected by unstable operating conditions.

After mastering the standardized SOH parameter reading process, operation teams can establish regular monitoring logs for all used lithium-ion forklift batteries under management, arrange targeted maintenance or replacement plans based on real objective data, and ensure the stable and safe operation of all material handling equipment in daily work.