Antigravity Small Case 4-Cell Lithium Battery

Antigravity Small Case 4-Cell Lithium Battery Fitting a bulky battery into a custom chopper frame or a stripped-down track bike is incredibly annoying. Standard lead-acid units are just too blocky, heavy, and difficult to conceal cleanly. The Antigravity Small Case 4-Cell Lithium Battery (SKU: antAG-401 / Part Number: antAG-401) solves this exact packaging bottleneck without adding useless bulk.This particular model is the most compact option available across the entire Antigravity Small Case series. Its dimensions measure exactly 4.375 x 1.37 x 3.75 inches. Because the casing is so thin, you can easily mount it under a custom seat cowl, drop it into a tiny fabricated tray, or strap it near the swingarm pivot. Total weight is only 15.2 ounces. That replaces pounds of clumsy lead hardware with a battery weighing under a single pound. It still pushes out 120 cranking amps to fire up your starter motor fast. You don't have to deal with acid spills eating your fresh powder coating, and there are no vent tubes to rout down your frame rails.Features and BenefitsTiny footprint: Measures under an inch and a half wide, making it easy to hide in tight chassis locations where regular batteries won’t fit.Massive weight drop: Weighs a mere 15.2 ounces, instantly cutting several pounds of dead weight off your machine.120 cranking amps: Delivers immediate, fast starting power for small or race-tuned engines.Zero leaks: Dry cell design eliminates toxic liquid acids, meaning zero corrosion risk and no messy vent lines.Variant setup: Functions perfectly as a variant product configuration, allowing easy matching with your overall electrical build plan.Vehicle Fitment The AG-401 model is highly specialized for small displacements and closed-course racing. Verify your exact engine needs prior to installation:Daily street bikes: Suited for small scooters, mopeds, and small-bore custom motorcycles under 250cc.Vintage projects: Fits custom cafe racers up to 350cc. Note that if your machine was manufactured before the mid-1980s, you must upgrade the charging system to a modern voltage regulator so it does not overcharge and destroy the lithium cells.Race track use: Engineered for closed-course road racing on inline 4-cylinder engines up to 600cc, or electric-start MX and Enduro dirt bikes up to 450cc.FAQCan I use my standard automotive battery maintainer on this? No. Do not do that or you will destroy the cells. You must use a dedicated, lithium-specific motorsport charger. Regular garage trickle chargers will overcharge or permanently damage this specific battery chemistry.Does this small case version have an internal Battery Management System (BMS)? No, it does not. The Small Case series utilizes balance charging instead of an internal BMS chip to keep the total dimensions as tiny as possible. This is why the manufacturer designates them primarily for custom builds and race tracks.Will this battery go dead if my bike sits in storage for months? Lithium cells can hold a charge for up to a full year, but only if your electrical system has zero parasitic draw. If your bike has an active digital clock, an ECU, an alarm, or aftermarket gauges, those components continuously pull power and will drain the battery while the key is out. Unhook your ground cable if the bike sits idle for long periods without a proper lithium maintainer.