Establish the vehicle and charger baseline
Record VIN, battery version, original market, inlet hardware and applicable charging documentation. Identify the charger and whether its connector, payment route and available service are suitable for the intended destination. A charger nameplate is not proof that the vehicle can accept that rating. Keep the actual charging limit separate from the station maximum and note any uncertainty. The Song Plus connector guide establishes the compatibility questions before a performance assessment. Where a seller cannot demonstrate the claimed capability through a supported setup, leave the relevant performance claim unresolved instead of substituting another version test.
Record conditions before the session starts
Note starting state of charge, ambient conditions, recent driving, relevant battery-temperature information if legitimately available and the planned observation window. Do not assume the display supplies every thermal parameter, or attempt unsupported diagnostic access to obtain it. A session following a long drive may not be comparable with a cold stored car. State what is known and what could not be observed. The battery-report limitations guide helps retain measurement boundaries. Do not present an unrecorded thermal condition as evidence of a failing battery when lower charging power could have several explanations.
Keep a sequence of power and charge readings
Use a session record showing time, charge level and power over a relevant interval, together with the station energy result where available. Preserve interruptions and warnings rather than excluding the least favourable part of the session. The curve is useful because charging power can change during a stop; one maximum value does not describe the average. Do not infer usable battery capacity from charger energy alone without accounting for the measurement basis. Keep the observer, equipment and session date with the file. A supported repeat assessment may be necessary if the first test cannot address the buyer intended route.
Separate faults from station and operating limitations
If the session stops or power is unexpectedly low, preserve the vehicle and charger messages before changing conditions or clearing history. Use the charging-interruption evidence guide to distinguish what was observed from an assumed cause. A working alternative station can narrow a question but does not diagnose every connector, battery or thermal issue. Have consequential warnings assessed by qualified personnel and stop using damaged equipment. Do not repeatedly reconnect an unsafe setup just to obtain a stronger marketing result. The test should create a usable condition record, not encourage a risky attempt to reach a brochure figure.
Translate the result into real stop planning
Plan the actual route with achievable arrival reserves, compatible stations, realistic charging windows and a fallback. Include time spent entering the site, activating payment and waiting where relevant, rather than treating charging duration as the entire stop. Use observed consumption from the EV range guide alongside the session evidence. Do not guarantee a fixed trip range or station availability from one test. If the route depends on a single unfamiliar charging location, investigate that access separately. The buyer should understand the assumptions before comparing this EV routine with a DM-i or another vehicle choice.
Decide what the evidence proves for this purchase
The final assessment should state whether the observed session answers the requirement, needs repetition or reveals an unresolved condition. Keep battery health, fast-charging capability and public-network access separate. A successful session is not a battery-health certificate, while a diagnostic health percentage does not prove charging performance. Refer to the Song Plus battery inspection guide for condition evidence. Reassess after consequential battery repair, software changes or candidate substitution. Compare vehicles using a consistent scope rather than claiming superiority from different temperatures, charge windows or station hardware.
Example: high peak power but an impractical stop
A seller supplies a brief image of a high reading, while the buyer route needs a repeatable stop within a limited time window. Ask for the full relevant session and its conditions. The peak can be genuine yet occur too briefly to describe the practical result. If the documented curve and site access support the routine, use that evidence in the comparison. If the stop remains uncertain, revise the route or shortlist. Do not turn a missing session log into a battery-failure diagnosis or a guaranteed charging-time promise based on the single most favourable moment.
Buyer checklist
- Candidate DC capability and inlet verified
- Session conditions disclosed
- Complete relevant sequence retained
- Warnings and limitations investigated
- Trip plan includes a supported fallback
Buyer questions
Does one peak-power screenshot prove a fast trip stop?
No. Assess the complete relevant charge window and site access under recorded conditions.
Can this EV result be used for every DM-i model?
No. Verify the actual PHEV capability and conduct the appropriate separate assessment.
Manufacturer references
BYD owner manuals by market and powertrain ↗Continue with the song plus ev range efficiency guide and charging guide checks.
