[R 70 Judge]

So I've been having hard starting issues with my 70 TA since I switched to Holley Terminator X EFI. The starter was struggling to generate enough cranking RPM to get the crank and cam sensors to sync so the ECU would fire the coils. This led to lots of frustration and the occasional kick-back. My engine is a reasonably spicy 484" IA2, Stock Highports, Northwind, 105mm TB, 13.8:1, 270'ish - 280'ish @.050 around .710' lift. on pump E85.

Battery is located in the trunk and I did the "big 3" upgrade. Wires are from GP Audio oxygen free copper (OFC) 2/0 power and grounds. 1/0 OFC from battery to starter. Very heavy duty/nice wiring.
https://gpcaraudio.com/collections/i...-bs-ofhc-cable

Starter is a Powermaster XS 9510, which fits great in a 2nd gen with 2" Hooker headers.
https://www.summitracing.com/parts/p...0/make/pontiac

Previous battery was Napa Legend AGM 7565 Group 65 with 850CCA - 46.5 lbs
https://www.napaonline.com/en/p/BAX7...wUUZdngUGS7D7A

New batter is an Antigravity Battery Lithium Car Battery with Re-Start AG-24-60-RS BCI Group 24 - 1800CCA - 19.25 lbs
https://www.summitracing.com/parts/AVB-AG-24-60-RS

I used the Holley datalogging feature to record cranking RPM. I could not get an exact RPM until the crank and cam sensors were sync'ed but you can see on the graph where the cranking RPM was topping out for each battery. The AGM is on a scale of 0 - 300 RPM and the Lithium is on a 0 - 500 RPM.

Napa AGM: 13.1 volts resting voltage, 10.3 volts during cranking (ranged from 10.3 - 10.6 during cranking) 110 RPM cranking

Antigravity Lithium: 13.3 volts resting voltage, 12.5 volts during cranking (ranged from 12.5-12.8 volts during cranking) 325 RPM cranking The Antigravity battery maxed out the starter at 325 RPM. You can tell by the sound of it that it literally cannot spin any faster.

So there are some real-world results from the latest in battery technology. The Antigravity batteries are quite expensive but it was 100% worth it to me. It also has a "Re-Start" feature that rescues you if your battery happens to go dead. Prior to going lithium I was in the process of switching to an X2 AGM 1150 CCA battery but the 80 lbs weight got me looking at lithium's.