Antigravity ATX30 specs, fitment and lithium battery trade-offs
What the Antigravity ATX30 is and why it gets searched
The Antigravity ATX30 is a lithium powersports starter battery family for riders, builders and workshops looking to replace large lead-acid motorcycle batteries with a lighter option. In most searches for “antigravity atx30,” the comparison usually comes down to two related models: the ATX30-RS, which includes Antigravity’s RE-START reserve-starting feature, and the ATX30-HD, a higher-capacity heavy-duty version without RE-START. Both use the YTX30 case size and are commonly considered for touring motorcycles, large V-twins, powersports vehicles and some race-only projects where weight, cranking output and packaging are important.
The ATX30 should not be treated as a generic lithium upgrade. The model choice changes the practical trade-off. The ATX30-RS is built around recovery from an over-discharged condition, while the ATX30-HD gives priority to higher capacity and cranking output. For more workshop and battery-related explainers, visit the Taodili Insight section.
Antigravity ATX30 specifications at a glance
Antigravity’s published product information lists the ATX30-RS as a lithium-ion, LiFePO4-based replacement for YTX30 lead-acid batteries, as well as some YIX and GYZ battery models. The ATX30-HD is described as the heavy-duty version in the same general case size. The table below summarizes the decision-relevant specifications from the manufacturer’s current product pages and manuals.
| Specification | ATX30-RS | ATX30-HD |
|---|---|---|
| Primary role | YTX30-size lithium powersports battery with RE-START | Heavy-duty YTX30-size lithium powersports battery |
| Case size | About 6.5 x 5 x 6.8–6.89 in | About 6.5 x 5 x 6.8 in |
| Cranking output | 880 cranking amps | 970 cranking amps |
| Capacity listing | 32 Ah PbEq, 16 Ah actual, 204 Wh | 48 Ah PbEq, 24 Ah actual, 307 Wh |
| Weight | 5.75 lb | 7.81 lb |
| Chemistry | LiFePO4 lithium | LiFePO4 lithium |
| Battery management | Full BMS with protections and cell balancing | Full BMS with protections and cell balancing |
| Special feature | RE-START built-in reserve-starting function | Lighted voltage indicator; no RE-START |
| Mounting | Manufacturer states it can be mounted in any orientation | Manufacturer states it can be mounted in any orientation |
The capacity line deserves close attention. PbEq is a lead-acid equivalent rating used for comparison in starter battery marketing. Actual amp-hours and watt-hours are more useful when estimating reserve time, accessory load tolerance and how long a battery may handle parasitic draw before it needs charging.
ATX30-RS versus ATX30-HD
The ATX30-RS is the model many riders associate with the Antigravity ATX30 name because it includes RE-START. Antigravity describes RE-START as a system that monitors battery status and puts the battery to sleep before it is fully depleted, leaving reserve energy available to start the vehicle after the rider activates the battery button or a compatible remote accessory. That makes the RS model relevant for motorcycles that sit between rides or for users concerned about accidental key-on drain.
The ATX30-HD takes a different approach. It raises the published output from 880 to 970 cranking amps and increases listed capacity from 32 Ah PbEq to 48 Ah PbEq. Its actual energy capacity is also higher at 24 Ah and 307 Wh. Antigravity positions the HD version for heavier-duty use cases, including heavily accessorized touring motorcycles, racing and street performance vehicles, experimental aircraft and similar applications. The trade-off is clear: the HD model does not include RE-START, so the buyer gives up the built-in rescue function in exchange for more capacity and output.
A practical way to choose is to start with the problem the battery needs to solve. If the main concern is avoiding a no-start after slow drain, the ATX30-RS is the more distinctive option. If the vehicle has higher accessory demand, needs more reserve energy or can benefit from the higher cranking rating, the ATX30-HD may be the better fit. Neither decision should be based only on the headline cranking number. Battery compartment size, charging system behavior and real accessory load all need to be checked.
Fitment considerations before replacing a lead-acid YTX30
The ATX30 family targets the YTX30 footprint, but “same case size” does not automatically mean “correct for every vehicle.” Before replacing any lead-acid battery with lithium, confirm the original battery group, terminal orientation, hold-down clearance and cable reach. Antigravity’s four-terminal design is intended to simplify installation across different layouts, but physical fitment should still be verified against the vehicle and the removed battery.
Electrical compatibility is just as important as the tray dimensions. Antigravity’s product information states that these models are not for general automotive use and advises contacting the manufacturer for possible race-only automotive applications. That warning is easy to miss because the ATX30 has high published cranking output. In service, however, a starter battery must work with the regulator, charging voltage, accessory loads and standby drain of the vehicle. A battery that suits a powersports application may still be a poor match for a modern street car or for a system with incompatible smart charging behavior.
For motorcycles and powersports vehicles, the most relevant checks are straightforward:
- Verify that the original battery is a YTX30, YTX30L-BS, compatible YIX or compatible GYZ-style unit.
- Measure the battery tray and hold-down space rather than relying only on model names.
- Check for parasitic draw from alarms, trackers, radios or aftermarket electronics.
- Confirm that the charging system does not exceed the battery’s stated maximum charging voltage.
- Use a lithium-compatible charger instead of a desulfating lead-acid charger.
This is where the RS versus HD decision becomes more than a specification comparison. A mostly stock motorcycle that sits between rides may benefit from RE-START. A touring bike with heated gear, lighting upgrades and several accessories may benefit more from the HD model’s added capacity, provided the charging system and installation are suitable.
Charging and maintenance limits that should not be ignored
Antigravity’s user manual lists these batteries as 12.8 V nominal LiFePO4 units and gives 14.6 V as the maximum charging voltage. It also specifies lithium iron phosphate chargers designed for 12.8 V motorsport batteries. This is not a minor service note. Charging compatibility is one of the main differences between maintaining a lithium starter battery and maintaining a conventional lead-acid battery.
Many older battery tenders and chargers were designed for flooded, AGM or gel lead-acid batteries. Some include desulfation or recovery modes that use voltage patterns not intended for lithium batteries. Using the wrong charger can shorten battery life or trigger protection behavior. The safer approach is to use a charger explicitly marked for 12.8 V LiFePO4 motorsport batteries and to follow the charger and battery manuals together.
Storage practices also change. Lithium starter batteries have low self-discharge compared with lead-acid batteries, but they are not immune to drain. A motorcycle with a clock, security module, ECU memory load or tracker can still pull a battery down over time. If the vehicle sits for weeks or months, check voltage periodically, disconnect unnecessary loads where appropriate and charge with compatible equipment before the battery reaches a deeply discharged condition.
The RE-START system can reduce the risk of being stranded, but it should not be treated as a substitute for proper maintenance. It is a reserve-starting feature, not an unlimited backup battery. After RE-START is activated and used to start the vehicle, the battery still needs the charging system or a compatible charger to restore energy. See also: Tool Categories.
Lithium battery advantages and trade-offs for powersports users
The clearest advantage of the ATX30 family is weight reduction. A YTX30-size lead-acid battery is often one of the heavier components that can be changed without fabrication. At 5.75 lb for the ATX30-RS and 7.81 lb for the ATX30-HD, these lithium models can remove meaningful weight from motorcycles and powersports vehicles while still offering high published cranking output.
Packaging flexibility is another advantage. Antigravity states that the ATX30-RS and ATX30-HD can be mounted in any orientation. For custom builds, powersports machines and race-focused layouts, that can make battery placement easier than with many conventional lead-acid units. According to Antigravity’s product information, the built-in BMS also adds protections such as over-discharge, over-charge, thermal protection and cell balancing.
The trade-offs matter just as much. Lithium starter batteries usually cost more than lead-acid replacements. They also rely more heavily on correct charging equipment and a healthy vehicle electrical system. Capacity can be misunderstood if buyers look only at PbEq values instead of actual amp-hours and watt-hours. Cold-weather behavior can also differ from lead-acid batteries, so riders in low-temperature climates should consult the battery manual and follow the recommended wake-up or starting procedure for lithium batteries.
For a workshop, dealer or serious DIY owner, the ATX30 comparison is a reminder that battery upgrades are not only about cranking amps. The right choice balances fitment, real capacity, charging compatibility, accessory demand and the rider’s tolerance for maintenance. The ATX30-RS and ATX30-HD both address weight and output, but they solve different ownership problems.
Who should consider the Antigravity ATX30
The Antigravity ATX30-RS is most compelling for riders who want a YTX30-size lithium replacement and value the safety net of a built-in reserve-starting function. It fits the search intent of a rider comparing lithium motorcycle batteries because its main feature is not only lower weight, but also a practical response to accidental discharge.
The ATX30-HD is better suited to users who are less focused on RE-START and more focused on capacity and cranking output. Its higher published watt-hour rating makes it the stronger candidate for heavier accessory loads or more demanding builds, provided the application is compatible. For both versions, manufacturer fitment charts and vehicle-specific checks should carry more weight than broad online fitment claims.
Buyers should be cautious if they are considering the ATX30 for general automotive use. Antigravity’s own wording limits these models to powersports and certain race-only contexts rather than normal street-car replacement duty. That does not make the battery weak; it means the system around the battery matters. A powerful small battery can still be the wrong battery if the charging strategy, standby load or vehicle type is outside the intended use.
Frequently asked questions
Is the Antigravity ATX30 a direct replacement for every YTX30 battery?
It is designed around the YTX30 case size, and Antigravity lists compatibility with YTX30 lead-acid batteries plus some YIX and GYZ models. Buyers should still confirm dimensions, terminal layout, cable reach, hold-down clearance and vehicle charging compatibility before installation.
What is the difference between ATX30-RS and ATX30-HD?
The ATX30-RS has 880 cranking amps, 32 Ah PbEq, 16 Ah actual capacity and the RE-START feature. The ATX30-HD has 970 cranking amps, 48 Ah PbEq, 24 Ah actual capacity and a lighted voltage indicator, but it does not have RE-START. The RS model favors recovery convenience; the HD model favors capacity and output.
Can I use a regular lead-acid battery charger with the ATX30?
Use a charger specifically intended for 12.8 V LiFePO4 motorsport batteries. Antigravity’s manual lists 14.6 V as the maximum charging voltage and specifies lithium iron phosphate charger compatibility. Avoid lead-acid chargers with desulfation or recovery modes unless the charger maker explicitly approves them for LiFePO4 batteries.
Is PbEq the same as actual amp-hours?
No. PbEq means lead-acid equivalent and is mainly a comparison figure. Actual amp-hours and watt-hours are better indicators of stored energy. For example, the ATX30-RS is listed at 32 Ah PbEq but 16 Ah actual and 204 Wh, while the ATX30-HD is listed at 48 Ah PbEq but 24 Ah actual and 307 Wh.
Is the Antigravity ATX30 suitable for cars?
Antigravity states that the ATX30-RS and ATX30-HD are not for general automotive applications and recommends contacting the company for potential race-only automotive use. For normal street cars, use a battery designed for that vehicle’s battery group, charging system and electrical load.