Antigravity ATZ 10 RS explained with specs, fitment, and charging notes
What the Antigravity ATZ 10 RS is
The Antigravity ATZ 10 RS is a 12.8-volt lithium iron phosphate powersports starter battery. It is designed as a lightweight replacement for several YTZ and YTX lead-acid battery sizes. Its main selling points are reduced weight and Antigravity’s RE-START function, which can place the battery into a protected sleep state before it is fully drained, leaving reserve energy for an emergency start.
In practical use, this model is most relevant to motorcycle, ATV, and similar powersports owners who want a compact LiFePO4 battery with built-in battery management protection. It is not a drop-in decision based only on case size, though. Lithium starter batteries have different charging, storage, and accessory-load limits than conventional lead-acid or AGM batteries.
Source note: Specifications and operating guidance in this article are based on Antigravity’s official ATZ10-RS product information, the Antigravity Powersports RS Batteries User Manual, and the company’s current price/specification sheet reviewed on October 15, 2026. For more workshop and battery technology coverage, see our Insight section.
Key specifications at a glance
The ATZ10-RS sits in the YTZ10 case-size class. That makes it a physical candidate for bikes and powersports vehicles that originally used certain compact lead-acid or AGM batteries. The rating labels still need careful reading. Antigravity lists 12 Ah as the lead-equivalent rating, while actual capacity is 6.1 Ah and energy is 78 Wh. These figures are not contradictory; they describe different ways of comparing a lithium starter battery with older lead-acid formats.
| Specification | Antigravity ATZ10-RS value | Why it matters |
|---|---|---|
| Battery chemistry | LiFePO4 lithium iron phosphate | Requires lithium-compatible charging and care |
| Nominal voltage | 12.8 V | Designed for modern 12-volt powersports systems |
| Cranking amps | 360 CA | Indicates starter burst capability |
| Capacity | 12 Ah PbEq / 6.1 Ah actual | PbEq is a lead-acid comparison, not the real stored amp-hour capacity |
| Energy | 78 Wh | Useful for comparing stored energy across battery types |
| Dimensions | 5.9 x 3.46 x 3.62 in / 150 x 88 x 92 mm | Critical for tray, strap, and terminal clearance |
| Weight | 2.6 lb / 1.17 kg | A major reduction versus many lead-acid equivalents |
| Maximum charge voltage | 14.6 V | Charging systems above this limit can damage lithium batteries |
| Maximum charge rate | 5 A on the ATZ10-RS label | Helps determine suitable external chargers |
A common selection error is to compare only the 12 Ah PbEq figure with the amp-hour label on the original lead-acid battery. For a starter battery, cranking output and voltage stability can be more important than reserve capacity during a short start event. For accessory-heavy bikes, however, actual amp-hours and parasitic drain deserve closer attention. Alarms, GPS units, USB outlets, heated gear controllers, and trackers can discharge a parked vehicle over time.
Fitment and replacement notes
Antigravity identifies the ATZ10-RS as a replacement for YTZ10S, YTZ12, YTZ14, YTX9, YTX9-BS, YTX7A-BS, and YT12A-BS lead-acid sizes. That list is a useful starting point, not a complete fitment check. Battery trays vary by motorcycle model year, aftermarket seat, accessory harness, and terminal routing. Before purchase or installation, compare the original battery’s length, width, height, terminal side, hold-down strap position, and cable reach.
The four-terminal design is one reason the ATZ10-RS can cover several applications. It allows the battery to be rotated so positive and negative cable positions are easier to match. That flexibility can simplify installation, but it does not remove the need to confirm polarity before tightening the cables. The Antigravity manual also specifies modest terminal torque, so the hardware should be secured firmly without over-tightening.
Antigravity describes the model as suitable for everyday use in bikes up to 1000 cc and states that it is not for automotive applications. That distinction matters. This is a powersports starter battery, not a car battery, not a deep-cycle power station, and not a general-purpose energy source for tools or camping loads. If a motorcycle has a high-compression engine, extensive accessories, or a non-standard charging system, the larger high-power version in the same case family may be worth comparing before choosing the ATZ10-RS.
How the RE-START feature changes the user experience
The RE-START system is the feature that separates this model from a simple lightweight replacement battery. According to Antigravity’s operating instructions, the battery can shut off terminal output when it senses severe over-discharge, preserving enough energy for a limited emergency start. To wake the battery, the user presses and holds the RE-START button on the top of the battery for about three seconds, turns off unnecessary electrical loads, and then attempts to start the vehicle.
This function is useful, but it should not be treated as extra capacity or a replacement for proper maintenance. It is a reserve strategy intended to reduce the chance of being stranded after lights, accessories, or parasitic drains have pulled the battery too low. After using RE-START, Antigravity instructs users to ride for at least one hour or fully recharge the battery as soon as possible with a proper LiFePO4 charger. That follow-up matters because the battery has just been recovered from a deeply discharged condition.
Battery access is another practical detail. On some motorcycles, the battery is under the seat and easy to reach. On others, access may require tools or panel removal. Antigravity offers a remote switch accessory for difficult battery locations, but the operational point is straightforward: know how to reach or trigger the RE-START function before relying on it during a roadside situation.
Charging, storage, and maintenance limits
Lithium starter batteries require different charging habits than traditional lead-acid batteries. The Antigravity manual says the battery should be charged with equipment intended for 12.8-volt LiFePO4 motorsport batteries, with a maximum charging voltage of 14.6 V. It also warns against chargers made specifically for lead-acid batteries unless the correct lithium profile is selected. A charger that uses lead-acid desulfation or the wrong voltage behavior can damage a LiFePO4 battery.
The vehicle’s charging system matters as much as the external charger. Antigravity notes that modern stock 12-volt motorcycle charging systems are generally appropriate under normal operating conditions, but it also warns about defective voltage regulators and older or custom charging systems. The manual specifically flags older pre-1995 motorcycles and custom setups as areas where overcharging can become dangerous. If a bike’s regulator allows voltage to exceed 14.6 V most of the time, the charging system should be tested before the battery is blamed. See also: Tool Categories.
Storage is another area where the ATZ10-RS rewards planning. Antigravity’s manual says the battery can hold charge for many months when disconnected, but in-vehicle storage depends on parasitic draw and accessory loads. The manual recommends storage mode or disconnection for storage longer than two months, plus voltage checks every four to five months. Storage mode is activated by holding the RE-START button for about 10 seconds, which cuts voltage at the terminals. Waking the battery again requires a shorter three-second press.
Cold weather also changes lithium behavior. A LiFePO4 battery can feel sluggish on the first start attempt in very cold conditions because internal resistance rises when cold. Antigravity’s manual describes a self-warming approach, such as brief starter bumps or leaving lights on briefly to get current flowing, before making a full start attempt. In hard-freezing conditions, a battery warmer or a more conservative battery choice may be appropriate.
When the ATZ10-RS makes sense and when it may not
The ATZ10-RS makes the most sense for riders who want a lighter replacement battery in a compatible YTZ10-size application, ride often enough to keep the battery charged, and are willing to use lithium-specific charging equipment. The low weight, 360 CA rating, integrated BMS, and RE-START reserve function are meaningful upgrades over a basic lead-acid replacement when the motorcycle’s electrical system is healthy.
It may be less suitable for owners who rarely ride, leave multiple accessories connected, cannot easily access the battery, or use an older charging system that has not been tested. It is also not the right product for someone who wants a deep-cycle battery to run electronics for long periods while the engine is off. In those situations, a higher-capacity battery, an accessory power plan, or a conventional AGM battery with a maintainer may be the safer choice.
The practical takeaway is to evaluate the ATZ10-RS as part of the vehicle’s electrical system, not only as a spec sheet. The battery, voltage regulator, charger, accessory load, and storage routine all have to work together. If those pieces are matched correctly, the ATZ10-RS offers a lightweight lithium option with a useful emergency-start feature. If they are not matched, the battery’s protection electronics can only compensate so much.
Frequently asked questions
Is the Antigravity ATZ10-RS the same as a jump starter?
No. It is a starter battery with a reserve wake-up function. The RE-START feature can preserve enough energy for an emergency start after over-discharge, but it is not the same as carrying a separate jump starter pack.
Can I charge the ATZ10-RS with a regular lead-acid charger?
Only if the charger has a correct 12 V LiFePO4 profile and stays within the battery’s voltage and current limits. Antigravity warns against lead-acid-only chargers, especially chargers with modes that are not intended for lithium iron phosphate batteries.
What vehicles does the ATZ10-RS replace?
Antigravity lists it as a replacement for several compact lead-acid sizes, including YTZ10S, YTZ12, YTZ14, YTX9, YTX9-BS, YTX7A-BS, and YT12A-BS. Physical dimensions, terminal position, cable routing, and the vehicle’s charging condition should still be checked before installation.
What does 12 Ah PbEq mean?
PbEq means lead-equivalent amp-hours. It is a comparison number used to relate lithium starting performance to lead-acid batteries. The ATZ10-RS actual capacity is listed as 6.1 Ah, with 78 Wh of energy, so buyers should not treat 12 Ah PbEq as the same as 12 actual amp-hours.
Does the ATZ10-RS need maintenance during winter storage?
Yes. It has low self-discharge, but accessories and parasitic loads can still drain it when installed in a vehicle. For storage beyond two months, Antigravity recommends storage mode or disconnection, periodic voltage checks, and recharging when necessary with a compatible LiFePO4 charger.