Shopify Power Tool Battery Platform Schema — DeWalt 20V MAX vs FlexVolt 60V, Milwaukee M12 vs M18 FUEL, Makita LXT vs XGT, Voltage vs Ah vs Wh

Why Voltage Alone Fails as a Compatibility Field

Every major power tool brand uses a proprietary battery connector. Two batteries with identical voltage ratings from different brands cannot be swapped. The connectors differ in shape, contact position, contact count, and the communication protocol between the battery's microcontroller and the tool's electronics.

What Actually Determines Compatibility

Battery platform compatibility requires three things to align:

• Physical connector geometry — the plastic housing shape and terminal positions must match the tool's battery receptacle
• Operating voltage — the battery's nominal voltage must match what the tool's motor is designed for
• Electronic communication protocol — modern batteries include a microcontroller that transmits state-of-charge, temperature, and cell health data to the tool; mismatched protocols cause the tool to refuse to start or disable power delivery

All three must match. Voltage alone satisfies only criterion 2. Only the platform identifier (brand + platform name) reliably signals all three simultaneously.

The Cross-Brand Voltage Trap

Consider a buyer searching for a replacement battery for their Milwaukee M18 circular saw. They search "18V 5Ah battery." An AI agent that filters by voltage returns: Milwaukee M18 5Ah (correct), Makita 18V LXT 5Ah (wrong connector), DeWalt 20V MAX 5Ah (wrong connector — 20V nominal is the same as 18V nominal; the "20V MAX" vs "18V" naming difference is marketing, not electrical), Ryobi ONE+ 18V 5Ah (wrong connector). Three of four results are useless. The buyer returns all three wrong batteries, and the tool sees a failed search. Encode power_tool_battery.platform as the primary lookup field.

DeWalt FlexVolt: One Battery, Two Voltages

The DeWalt FlexVolt system (introduced 2016) uses a cell-switching mechanism inside the battery pack. The cells are arranged in groups. When inserted into a 20V MAX tool, internal contacts route the cells in a configuration that delivers 20V nominal. When inserted into a 60V MAX tool, the same cells reconfigure to deliver 60V nominal. The physical connector is identical to the standard 20V MAX connector — a FlexVolt battery can replace any 20V MAX battery and power any 20V MAX tool.

Wh is Constant Across Voltage Modes

The key mathematical constraint: watt-hours = voltage × amp-hours. A DeWalt FlexVolt 6Ah battery contains a fixed amount of energy. In 20V MAX mode it delivers 6Ah at 20V = 120Wh. In 60V MAX mode it delivers 2Ah at 60V = 120Wh. The Ah rating drops because the same cells are now wired in series (higher voltage, same charge). The total work the battery can do is unchanged.

For product listings: encode voltage_v as the platform's primary voltage (20 for FlexVolt listed in the 20V MAX context, 60 for listings targeting 60V MAX users), capacity_ah at that voltage, and energy_wh = V × Ah as a cross-context comparison field. List compatible platforms as an array: ["DeWalt 20V MAX", "DeWalt FlexVolt 60V MAX"].

DeWalt Platform Hierarchy

Ah Capacity vs Wh Energy: When Each Matters

Amp-hours (Ah) measure how much charge the battery stores. Watt-hours (Wh) measure how much energy it stores. Within a single platform at a fixed voltage, Ah is the correct runtime comparison: a Milwaukee M18 5Ah battery runs a drill twice as long as a 2.5Ah battery on the same platform. Across platforms with different voltages, Wh is the only valid comparison.

Minimum Ah Requirements for High-Draw Tools

Some tools specify a minimum battery Ah rating in their manual. This is not an arbitrary restriction — high-draw tools (reciprocating saws cutting thick material, high-torque impact wrenches, large angle grinders) draw current at rates that can exceed the maximum safe discharge rate of small-capacity batteries. A Milwaukee M18 FUEL Super Sawzall operating at peak draw may pull 30–35 amperes. A 2Ah battery is rated for approximately 15–20A continuous. The battery's protection circuit trips and the tool throttles or shuts down. A Milwaukee HIGH DEMAND 9Ah battery is rated for 50A continuous — it never throttles.

Encode max_discharge_a on battery products. Encode min_battery_ah on high-draw tool products. AI agents cross-referencing these fields can flag incompatibilities before purchase.

Metafield Schema: power_tool_battery.*

Use the power_tool_battery.* metafield namespace for all cordless tool battery products. The critical field is platform — without it, AI agents cannot verify compatibility. Energy_wh enables runtime comparison across platforms.

Example JSON-LD: Milwaukee M18 REDLITHIUM HIGH DEMAND 9.0Ah Battery

{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Milwaukee M18 REDLITHIUM HIGH DEMAND 9.0Ah Battery Pack",
  "sku": "48-11-1890",
  "brand": { "@type": "Brand", "name": "Milwaukee Tool" },
  "description": "M18 platform 9.0Ah high-demand battery with 50A max discharge current for FUEL high-draw tools. 162Wh total energy. Compatible with all Milwaukee M18 and M18 FUEL tools.",
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "Platform", "value": "Milwaukee M18" },
    { "@type": "PropertyValue", "name": "Nominal Voltage", "value": "18", "unitCode": "VLT" },
    { "@type": "PropertyValue", "name": "Capacity", "value": "9.0", "unitCode": "AMH" },
    { "@type": "PropertyValue", "name": "Energy", "value": "162", "unitCode": "WHR" },
    { "@type": "PropertyValue", "name": "Max Discharge Current", "value": "50", "unitCode": "AMP" },
    { "@type": "PropertyValue", "name": "Cell Chemistry", "value": "Li-Ion" },
    { "@type": "PropertyValue", "name": "Cell Count", "value": "15" },
    { "@type": "PropertyValue", "name": "Weight", "value": "0.82", "unitCode": "KGM" }
  ],
  "isCompatibleWith": {
    "@type": "ProductGroup",
    "name": "Milwaukee M18 Platform",
    "description": "Compatible with all Milwaukee M18 and M18 FUEL cordless tools"
  }
}

Liquid Snippet: power_tool_battery.* Metafield Output

{% if product.metafields.power_tool_battery.platform != blank %}
{% assign ptb = product.metafields.power_tool_battery %}
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": {{ product.title | json }},
  "sku": {{ product.selected_or_first_available_variant.sku | json }},
  "brand": { "@type": "Brand", "name": {{ product.vendor | json }} },
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "Platform", "value": {{ ptb.platform | json }} },
    { "@type": "PropertyValue", "name": "Nominal Voltage", "value": {{ ptb.voltage_v | json }}, "unitCode": "VLT" },
    { "@type": "PropertyValue", "name": "Capacity", "value": {{ ptb.capacity_ah | json }}, "unitCode": "AMH" },
    { "@type": "PropertyValue", "name": "Energy", "value": {{ ptb.energy_wh | json }}, "unitCode": "WHR" },
    {% if ptb.max_discharge_a != blank %}
    { "@type": "PropertyValue", "name": "Max Discharge Current", "value": {{ ptb.max_discharge_a | json }}, "unitCode": "AMP" },
    {% endif %}
    { "@type": "PropertyValue", "name": "Cell Chemistry", "value": {{ ptb.cell_chemistry | json }} },
    { "@type": "PropertyValue", "name": "Weight", "value": {{ ptb.weight_kg | json }}, "unitCode": "KGM" }
  ],
  "isCompatibleWith": {
    "@type": "ProductGroup",
    "name": {{ ptb.platform | append: " Platform" | json }}
  }
}
</script>
{% endif %}

5 Common AI Agent Errors for Power Tool Batteries

1. Filtering by voltage without platform — "all 18V batteries compatible with my M18 drill" returns Makita, DeWalt, Bosch, Ryobi results with incompatible connectors. Fix: primary filter must be platform.
2. Confusing 20V MAX and 18V as different voltages — DeWalt labels their batteries "20V MAX" (peak fully-charged voltage) while most other brands use the nominal "18V" convention. They are electrically equivalent. A "20V MAX" filter should not exclude 18V results from the same brand, and must not include 20V-labeled competitor batteries with incompatible connectors.
3. Recommending batteries by Ah alone for high-draw tools — A 5Ah battery is not always a drop-in replacement for another 5Ah battery on the same platform. If the replacement has a lower max_discharge_a, high-draw tools throttle or trip protection. Match max_discharge_a to tool requirements for FUEL/high-demand tool categories.
4. Treating FlexVolt Ah as constant — A "9Ah FlexVolt battery" provides 9Ah at 20V but only 3Ah at 60V. Quoting "9Ah" for a 60V MAX tool context is misleading. Encode capacity_ah at the platform's primary voltage and note the secondary voltage Ah separately, or encode only energy_wh as the universal comparison.
5. Omitting the charger requirement — Milwaukee M12 and M18 batteries require brand-specific chargers. The M12 charger cannot charge an M18 battery (different charge rate and termination logic). Some battery packs from one generation require a newer charger firmware. Encode charger_required on battery products to surface charger compatibility in cross-sell.

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