A 220Ah lead-acid battery like the Victron Gel Deep Cycle 12V 220Ah only delivers about 110Ah usable at the 50 percent depth of discharge that keeps lead healthy, roughly 1,320 Wh. Because LiFePO4 safely uses about 80 percent of its capacity, you need only around 129Ah of lithium to match it, at a fraction of the weight.
Best-value lithium replacement
Power Queen 12V 200Ah PLUS
Gives 2,048 Wh usable against about 1,320 Wh from your lead, and saves roughly 48 kg.
Fit: your Group 8D box is 527x283x250 mm, the lithium is 522x240x220 mm. Fits the original tray
Renogy 12V 300Ah (Self-Heating)
Before you swap
A lithium battery that fits the tray is not automatically plug and play. Check your charger profile, fit a DC-DC charger if you charge from an alternator, set any solar MPPT to lithium, review fusing and cable, add a shunt monitor, and never mix lithium with lead. For your setup see the marine, campervan and off-grid guides.