Group 48 dimensions are exact and the hold-down clamp sits flush — zero modifications needed. Took a couple of charge cycles to reach full capacity out of the box, which is typical for lithium but worth setting expectations on.

Pulled the old lead-acid Group 48 out and put the Antigravity in and the difference in how the front of the car feels is actually real — that much mass gone from the nose. Cranking is strong and it's been flawless for months.

H6 fitment was exact — posts landed right under the hold-down and the terminals lined up cleanly with the stock cables. Lithium chemistry means it holds a charge sitting on a jack stand for weeks without needing a tender.

Cold mornings that used to make the old AGM labor just don't faze this lithium H6 — it snaps the engine over confidently every time. Build quality is excellent, terminals are solid, and nothing rattles in the tray.

Lithium H6 performance is undeniably better than conventional — faster cranks, lighter weight, better charge retention over weeks of sitting. Price is real money, but if you keep your cars long-term the cycle life math makes it worth it.

Stock H6/Group 48 in my car was already on borrowed time so I went straight to lithium — cranking amps feel stronger, the battery barely warms up even on hot starts, and the weight reduction is a genuine bonus. Very happy with this Antigravity.

Picked this up expecting the usual heavy Group 48 brick and nearly dropped it — lithium weight savings are wild. Cranking power is excellent across a wide temperature range; no more sluggish starts after the car sits over a cold weekend.

Ran this Antigravity H6/Group 48 lithium through a full winter and it cranks just as hard in January as it did in August — lead-acid can't say that. The weight alone would have sold me, but the consistent cold-crank performance is what's making me never go back.

Build quality is excellent. Everything lined up perfectly. Feels way pricier than what it cost. Really well built. Can't complain.

Antigravity's H6/Group 48 lithium fit my factory tray perfectly and the cold-cranking difference versus the OEM AGM was apparent on the very first start — engine catches faster and the alternator settles down quicker. Half the weight of what came out and it shows.

Setup took no time. Exactly as described. Works right out of the box. Delivery was way quicker than expected. Love it so far.