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Yamaha Golf Car UMAX AC Replacement Battery

Yamaha Golf Car document a Trojan Battery Company battery (6V) for the UMAX AC (2027). Specifications and any replacement options are below, each with its source.

Last updated: 16 September 2026

trojanbattery.com/products/t-105-6v-flooded-battery

The battery for this vehicle

T-105 6V Flooded Lead Acid

SKU T-105

OEM
Capacity
185 Ah at 5 hours, rising to 250 Ah at 100

Source: trojanbattery.com/products/t-105-6v-flooded-battery

Energy of one block (the cart carries 8)
1.50 kWh

Source: trojanbattery.com/products/t-105-6v-flooded-battery

Why this pack is listed for the UMAX AC

“Standard: Eight 6-volt Trojan® T-105 batteries.”

The manufacturer's own statement for this pack. Reported, not endorsed — confirm with the manufacturer before buying or fitting.

Only Yamaha state this for the 2027 UMAX AC and give no other option for it. They do not say which earlier model years take the same bank. Check yours before buying.

Maker lists it as a direct fit. Yamaha list this battery for this vehicle in their own specification table, so no adapter, no bracket and no charger change is implied — it is what the vehicle is built to take. Eight of them make the 48-volt bank.

Full specifications, sources and every vehicle this pack fits.

View battery: T-105 6V Flooded Lead Acid →

Source for these specifications

  • Yamaha — 2027 UMAX AC specificationsManufacturer model page

    Source: yamahagolfcar.com/models/umax2-ac/specs

    Retrieved September 16, 2026

Replacement options from other makers

Neither manufacturer names the other. One publishes what the device requires, the other publishes what the battery does, and the two are compared here, including wherever they do not meet.

Only the 48-volt system this cart states and this pack shares — check yours before buying.

Sources do not establish: Everything except the voltage. Trojan names one cart anywhere read — the E-Z-GO RXV Gen 1 ELiTE — and it is not this one. Whether the pack physically fits this cart's battery bay is unestablished: Trojan publishes dimensions (544 x 325 x 266 mm) and no cart maker here publishes a bay. Whether the cart's existing charger suits it is unestablished. Whether the cart's controller, onboard computer or CAN system accepts a single pack where a string used to be is unestablished. A matching voltage is the start of this question and not the end of it.

Two first-party figures compared, with neither company naming the other: this cart's maker states a 48-volt system and Trojan states a 48-volt 171 Ah pack. A single pack replacing a string changes the arrangement as well as the chemistry — where a cart carried six or eight batteries wired in series, this is one. Recorded at the comparison tier because that is all the agreement of two numbers supports.

Figures comparedView battery: Trojan Battery Company OnePack S2 48V 105Ah Lithium Battery →

Two first-party figures compared, with neither company naming the other: this cart's maker states a 48-volt system and Trojan states a 48-volt 105 Ah pack. A single pack replacing a string changes the arrangement as well as the chemistry — where a cart carried six or eight batteries wired in series, this is one. Recorded at the comparison tier because that is all the agreement of two numbers supports.

Source: trojanbattery.com/products/onepack-s2-48v-105ah-lithium-battery

Sources

  • Trojan Battery Company — OnePack Extended Range XR 48V 171Ah Lithium Battery PackManufacturer battery page

    Trojan Battery Company

    Source: trojanbattery.com/products/onepack-extended-range-xr-48v-171ah-lithium-battery-pack

    Retrieved September 15, 2026

  • Trojan Battery Company — OnePack High Performance HP 48V 171Ah Lithium Battery PackManufacturer battery page

    Trojan Battery Company

    Source: trojanbattery.com/products/onepack-hp-48v-171ah-lithium-battery-pack

    Retrieved September 15, 2026

  • Trojan Battery Company — OnePack S2 48V 105Ah Lithium BatteryManufacturer battery page

    Trojan Battery Company

    Source: trojanbattery.com/products/onepack-s2-48v-105ah-lithium-battery

    Retrieved September 15, 2026

  • Trojan Battery Company — T-105 6V flooded lead-acid datasheetManufacturer document

    Trojan Battery Company

    Source: iconev.com/wp-content/uploads/2022/09/Trojan-T-105-6V-Flooded-Lead-Acid-.pdf

    Retrieved September 15, 2026

  • Trojan Battery | T-105 6V Flooded Lead Acid BatteryManufacturer document

    Trojan Battery Company

    Source: trojanbattery.com/products/t-105-6v-flooded-battery

    Retrieved September 16, 2026

  • Archived document

    Source: golfcars.yamaha-owners-manuals.com/om/LIT-19626-A3-90.pdf

    Retrieved September 28, 2026

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