Why Spec Sheets Vary So Much
Two battery spec sheets can look similar and carry very different amounts of information. One states the conditions under which each number was measured; the other prints round values with no footnotes. A buyer who has a template in mind can tell the two apart in a minute, and can send the gaps back to the supplier as specific questions instead of vague doubt. This page describes the sections a complete specification sheet should carry, section by section, so the template can be applied to any quotation.
Section One: Identity
The sheet names the exact model, the chemistry, the intended application and the revision date of the document itself. The revision date matters more than it looks: batteries evolve, and a quotation that references a datasheet revision is a quotation that can be checked after delivery. A model number without a revision history is a document without a memory.
Section Two: Electrical Data
| Field | What it should state |
|---|---|
| Nominal voltage | The pack voltage as shipped, such as 12.8 V, 25.6 V or 51.2 V |
| Rated capacity | Ampere-hours with the discharge rate and temperature of the measurement |
| Rated energy | Watt-hours, consistent with voltage times capacity |
| Charge voltage and current | The charger settings the model requires, and the maximum charge current |
| Continuous discharge current | The value with a duration, and whether the cell or the BMS sets it |
| Peak discharge current | The value with its allowed duration in seconds |
| Internal resistance | The measurement method, because values differ by method |
| Self-discharge | Percentage per month and the temperature it was measured at |
Section Three: BMS and Protection
The protection list is the part of a specification sheet that decides field behavior, and it should state each threshold as a value: overcharge voltage and its release condition, over-discharge voltage, continuous and peak over-current limits, short-circuit response, and the temperature limits for charge and discharge. It should also say whether balancing is passive or active and at what voltage it acts, and what the pack draws in standby. A supplier who provides this list in writing is a supplier who has measured it.
Section Four: Communication and Indicators
The sheet names the interfaces the model carries, such as CAN, RS485 or RS232, and references the protocol document and cable pinout rather than describing them in prose. It should also state what the user can see: a state-of-charge display, indicator lights or app access, and whether protocol selection is set at the factory or in the field.
Section Five: Mechanical and Environmental
- Dimensions, weight and terminal type, so enclosures and trays can be designed once
- Ingress protection rating for the housing, and the mounting positions the design allows
- Operating temperature ranges for charge and discharge, stated separately
- Storage temperature range and the recommended storage state of charge
- Maximum operating altitude where the market requires it
Section Six: Compliance and Transport
The sheet lists the marks that apply to the model, names the documents behind them, and states their availability: certificate copies on request, a UN 38.3 test summary for shipping, and a safety data sheet. Marks named without documents are claims; the specification sheet should make it clear which documents exist and how to get them.
Section Seven: Test Conditions and Revision History
The footnotes make the numbers comparable. Capacity with its rate and temperature, cycle life with its depth of discharge and end point, and the date and letter of the current revision turn a page of figures into a record. When a revision changes a value, the change should be visible, because projects are quoted on one revision and delivered on another.
Red Flags When Reading a Spec Sheet
- Round numbers with no measurement conditions anywhere on the page
- A cycle-life claim with no depth of discharge and no end-of-life point
- Protection functions named without threshold values
- Certificate logos without a statement of which model they cover
- No revision date, or a model number that no certificate matches
Using This Page as a Template
- Send the section list to each candidate supplier as the format for their datasheet
- Score the returned sheets by the gaps, not by the headline numbers
- Ask each gap as a written question and file the answer with the quotation
- Reference the accepted datasheet revision in the purchase order
- Re-check the revision at every repeat order
Where YueQi Fits
YueQi New Energy, based in Zhongshan, Guangdong, publishes model-by-model datasheets for its LiFePO4 range across 12.8V, 25.6V and 51.2V packs, home storage units and portable power stations, following the section structure above. Where a field needs a written value for a contract, the answer is provided per model, and values still being confirmed by the manufacturer are to be confirmed in writing rather than printed as placeholders.
Next step
Send your application, target specification and estimated quantity with your inquiry, and we will confirm matching products, samples and document requirements in writing. See the product lines or request a quote.