Antigravity RE-START Car Batteries: How Wireless Jump Starting Works and When You Actually Need It

The Antigravity RE-START automotive battery does something no lead-acid battery has ever done: it monitors its own voltage continuously, puts itself to sleep before it dies completely, holds back enough energy to start the car one more time, and lets you activate that reserve from the driver's seat without opening the hood. It's a legitimate engineering solution to a problem every track driver, weekend warrior, and daily driver has run into at some point — a dead battery at the worst possible time.

This guide covers how the RE-START system actually works at a mechanical level, when that function saves you, which group sizes are available, how to pick the right amp-hour rating for your application, and what the BMS does beyond just jump starting.

How the RE-START System Actually Works

The RE-START function is built into the Battery Management System that lives inside every Antigravity automotive lithium battery. It's not a separate add-on or an external device — it's part of the battery itself. Here's what happens step by step when the system engages.

Continuous Voltage Monitoring

The BMS monitors the battery's voltage in real time, all the time — whether the vehicle is running, parked, or sitting in storage. It's watching for the voltage curve that indicates over-discharge is approaching: the point where a lithium cell starts heading toward damage territory and where a lead-acid battery would simply die.

Sleep Mode Activation

Just before the battery hits a critically low voltage — the threshold where a conventional battery would be dead and unrecoverable without external charging — the BMS pulls the battery into a protected sleep state. It disconnects the main circuit to stop the drain. Critically, it does this while there's still enough charge in reserve to produce a high-current starting burst.

The Reserve Start Pulse

That reserved energy isn't just sitting there passively. When you press the wireless keyfob button, the BMS reconnects the circuit and delivers a high-current discharge pulse to the starter motor — enough to crank the engine and get you going. The keyfob range is sufficient to activate from inside the car without opening the hood. There's also a manual button on top of the battery itself as a backup if the keyfob isn't handy.

After RE-START

Once the engine starts, the alternator takes over and begins recharging the battery normally. The BMS returns to its active monitoring state. The RE-START function resets and is available again once the battery has been sufficiently recharged. It is not a repeatable emergency drain — if you RE-START, drive away, and then immediately kill the engine without giving the alternator time to recharge, the reserve won't be available again immediately.

When You Actually Need RE-START

It helps to think through the real scenarios where this matters. RE-START isn't a gimmick — it targets a specific failure mode that happens far more often than most drivers account for.

Lights Left On at the Track

At a track day or HPDE event, you run a session, pull into the paddock, kill the engine, and start reviewing data or talking to your instructor. The headlights are on because you were running in grid or because your car's DRLs don't shut off with the ignition. Two hours later, dead battery. With RE-START, the BMS catches the discharge before it's fatal, and you press the keyfob instead of hunting for jumper cables in a crowded paddock.

Parasitic Drain from Electronics

Modern performance cars carry significant parasitic loads — ECU memory, alarm systems, data loggers, Bluetooth modules, dash cameras, phone chargers left plugged in. On a car with a standard lead-acid battery these drains are managed because lead-acid tolerates a slower discharge curve. Lithium batteries, without BMS protection, can be damaged by this kind of sustained low-level drain. The RE-START BMS handles it by cutting off before damage occurs and preserving enough for one more start.

Extended Paddock Parking

For multi-day events — a weekend endurance race, an out-of-town track weekend — the car sits overnight in the paddock. Climate control, security systems, and ECU keep-alive circuits run the whole time. A stock lead-acid battery in marginal condition might not make it. An Antigravity RE-START battery holds charge significantly better due to lithium's lower self-discharge rate, and if it does dip too low, RE-START is there.

Storage Between Events

A dedicated track car that sits between events is one of the highest-risk use cases for any battery. Lithium chemistry handles extended storage far better than lead-acid — much lower self-discharge rate means it holds charge for weeks or months without a tender. But if a parasitic drain does pull it down, RE-START catches it.

When RE-START Won't Save You

RE-START is not a substitute for a healthy charging system. If your alternator is failing, your voltage regulator is spiking, or your battery has been over-discharged below the point where the BMS can still hold a reserve, RE-START won't help. It also won't help if the battery has been deeply discharged over an extended period — in that case, a lithium-compatible charger is the solution, not the keyfob.

The Full BMS: What Else It Does

RE-START is the most visible feature of the Antigravity automotive battery, but the BMS that powers it also does a lot of work that you'll never notice because it's preventing failures rather than recovering from them.

Over-Discharge Protection

Lithium cells are damaged by deep discharge in a way that lead-acid is not. A lead-acid battery can be brought back from a dead state repeatedly — it just loses capacity over time. A lithium cell taken below its minimum voltage threshold can be permanently damaged in a single event. The BMS's low-voltage cutoff prevents this from ever happening during normal use.

Over-Charge Protection

On the other side, lithium cells are also sensitive to over-voltage. A failing voltage regulator that spikes above the battery's maximum charge voltage will damage lithium cells. The BMS monitors for over-charge conditions and cuts off the circuit before damage occurs. This is the most common cause of lithium battery warranty claims — a bad regulator pushing too much voltage — and the BMS is the only thing that can prevent it.

Cell Balancing

A lithium battery is made up of multiple cells. Over time, those cells can drift apart in their state of charge, with some cells working harder than others. The BMS continuously balances the cells, keeping them in sync. This is what enables Antigravity to rate expected lifespan at 7 to 9 years — the BMS is actively extending cell life throughout the battery's service life.

Short-Circuit and Thermal Protection

The BMS includes short-circuit protection that cuts the circuit instantly if an abnormal load is detected, and thermal protection that monitors cell temperature and limits charge/discharge if the battery gets too hot. Both protect the battery and the vehicle from the kind of failure modes that make lithium batteries in consumer electronics a concern — but that are essentially non-issues in a properly BMS-managed automotive application.

Available Group Sizes and Specs

Antigravity RE-START automotive batteries come in exact OEM group sizes — they drop into the factory battery tray without modifications. H5, H6, and H7 together cover approximately 90% of modern European and American performance cars.

Battery weight varies by model but runs 8.5 to 17 lbs across the lineup — compared to 35 to 60 lbs for a lead-acid battery in the same group size. That 25 to 55 lb reduction comes out of a fixed location, almost always at the front of the engine bay, which affects weight distribution and front end feel measurably on a prepared car.

Choosing the Right Amp-Hour Rating

Within most group sizes, Antigravity offers multiple amp-hour options. This is where most buyers get stuck. Here's how to think through it.

Higher AH = More Reserve Capacity and More Weight

A 60Ah H6 battery weighs more than a 24Ah H6 battery and costs more. The tradeoff is reserve capacity — the amount of energy available to run electronics, ECU keep-alive circuits, and other loads with the engine off before the battery starts running low. For a daily driver or a car with significant electronics, more amp-hours is the right call. For a stripped track-only car where the battery does nothing but start the engine, a 24Ah model is lighter and still has plenty of cranking power.

Race-Only Track Cars

Antigravity explicitly offers 24Ah versions of the H6 and other sizes for race use only — cars that don't sit overnight, don't have accessories running with the engine off, and where the priority is minimum weight. These batteries still produce 1000 cranking amps, which is more than enough for any normally aspirated or forced-induction race engine. If your car lives at the track and goes back on a trailer, 24Ah is worth considering.

Street/Track Dual-Use Cars

For a car that does track days but also drives to and from events, 40Ah in the H6 or H7 is the practical sweet spot. Enough reserve capacity to handle normal driving demands, plenty of cranking power, and still substantially lighter than a lead-acid equivalent.

High-Electronics Vehicles

Cars with factory infotainment, multiple camera systems, complex alarm setups, or advanced ECUs — particularly Ferraris, late-model Porsches with the full PASM suite, and similar — can benefit from 60Ah or the H8 in 80Ah. Antigravity specifically notes that Ferraris and cars with heavy electronic loads should go H8 to avoid dashboard flags from insufficient amp-hour capacity.

Installation Notes

RE-START automotive batteries are OEM drop-in replacements in the listed group sizes. No additional modification or custom tray is needed. That said, there are a few things worth doing before and after installation.

• 1 Charge the battery before installation. Antigravity ships batteries partially charged, not at full capacity. Use a lithium-compatible charger (the Antigravity SC-series or a CTEK lithium mode) to bring it to full charge before first install. Do not use a lead-acid charger.
• 2 Check your voltage regulator and charging system. Use a multimeter to verify your alternator output is within spec — should be 13.8V to 14.4V at idle. A failing regulator that spikes above 14.4V will trigger the BMS's over-charge protection and, over time, can damage the cells. Fix charging system issues before you install a lithium battery.
• 3 Pair the keyfobs. Each RE-START battery ships with two wireless keyfobs. Follow the pairing procedure in the included documentation before relying on wireless activation. Keep one keyfob on your keyring and one as a backup in your gear bag.
• 4 Check for parasitic drains. If your car has known parasitic drain issues — a clock, alarm, data logger, or ECU keep-alive drawing current continuously — quantify the draw before installing a lithium battery. The BMS will protect the cells, but a large parasitic drain will trigger sleep mode faster than expected if the car sits for several days.

Frequently Asked Questions

How many times can I use RE-START before I need to recharge?

RE-START is a one-use emergency function per discharge event. After using it to start the car, drive long enough for the alternator to recharge the battery before relying on it again. It's not designed for repeated back-to-back starting attempts from a depleted state.

Can I use RE-START if the battery is completely dead?

No. RE-START requires that the BMS was able to enter sleep mode before the battery fully discharged. If the battery was drained past that threshold — by a very large parasitic load, a failed alternator, or external discharge — RE-START won't have a reserve to work from. A lithium-compatible charger is needed to recover in that case.

Does the keyfob work through the car body?

Yes. The wireless activation is designed to work from inside the vehicle, through the body panels, without opening the hood. You don't need to be near the battery for it to work.

Will an Antigravity RE-START battery work with my OEM battery management system?

For most vehicles, yes. The one known exception is Ford vehicles with PCM Controlled Smart Charging — the factory charging system doesn't play well with RE-START models. For all other makes, the battery drops in as an OEM replacement and the BMS handles compatibility internally.

How do I know which group size my car takes?

Your owner's manual lists the battery group size. It's also stamped on a label on your current battery. Antigravity's website has a vehicle fitment lookup tool if you're unsure. If you're still not sure, reach out to us at Track Ready Products and we'll help identify the right model.

Do I need to do anything special for long-term storage?

For storage over 30 days, charge the battery to full before parking the vehicle. If there are significant parasitic drains, disconnect the battery or use a lithium-compatible maintainer on the Antigravity SC-series. The low self-discharge rate of lithium means a fully charged Antigravity battery will hold charge for months without a tender under normal conditions.