The Battery Tender 081-0157 is a battery voltage indicator designed to sit on the SAE quick disconnect leads already running from your battery. It connects inline with any SAE quick disconnect system and displays battery voltage through a three-color LED indicator. Its plug uses the same two-pin J563 standard as the rest of the Battery Tender lineup. Compared with a stock setup that offers no quick battery check, this unit lets you read charge state without a multimeter. Per the manufacturer, a press of the indicator button shows battery state without tools or opening the engine bay. That makes it useful for track-day trailers, powersport garages, and bikes that sit between rides.
Installation centers on the Battery Tender ring-terminal harness. The manufacturer describes attaching the indicator to the ring terminal harness, after which the charger plugs into the indicator's output connector. The manufacturer also recommends that the indicator stay connected to the battery's ring terminal harness permanently. Before buying, confirm the display type. The manufacturer's current page for this connection describes a green, yellow, and red LED readout and points customers wanting exact numeric readings to a different model, the LCD Voltage Indicator with USB+USB-C (081-0159). Search terms this part fits include Battery Tender 081-0157 install, SAE quick disconnect voltage indicator, inline 12V battery voltage monitor, and motorcycle battery charge state tester.
Details vary by source. The manufacturer's page for this connection describes a three-color LED state readout and directs exact numeric readings to the 081-0159 model. Confirm the display type with the manufacturer before purchase.
Yes. The manufacturer recommends leaving the indicator connected to the battery's ring terminal harness permanently.
The manufacturer states the indicator uses the same SAE J563 quick disconnect connector as its chargers and accessories, and the charger plugs into the indicator's output connector.
The indicator is a plug-in accessory, so installation is simple if a Battery Tender ring-terminal harness with an SAE quick disconnect is already on the battery. The manufacturer describes attaching it to the ring terminal harness, with the charger then connecting to the indicator's output. Confirm the harness is SAE-type before ordering, since the indicator is built for that connector. Mount the harness to the battery terminals with the correct polarity first, then plug in the indicator. Keep it connected, as the manufacturer advises, so the readout is always available.
