Are the batteries in budget combo kits good enough?

Retailer reviews on Home Depot and verified-purchase Amazon reviewers repeatedly note that the 1.3Ah and 2.0Ah batteries shipped with entry-level kits are fine for drilling and driving but underpowered for saws and outdoor tools. A common community recommendation is to budget for at least one 4.0Ah or 5.0Ah battery as a near-term upgrade.