Bella was Armstrong and Rebecca Lowe’s record partnership led the Dragons to a seven wicket win in the Super Series50 interpro at Lisburn.
The pair shared a third wicket stand of 221 as they easily chased down what looked like a challenging 275 target set by the Scorchers.
Record stand for Rebecca Lowe and Bella Armstrong
New Zealander Armstrong top-scored with a 120-ball 154 that included 22 fours and two maximums, while Irish Under-19 international Lowe, playing at her home club, hit nine fours in a splendid 88.
Bella Armstrong made 154 not out - her 163* is still the record indivudual score for the tournament
Earlier, Louise Little had made 106 rom 86 balls (8 fours, 4 sixes), while Ireland captain Gaby Lewis scored 63 (8 fours, 2 sixes).
Pembroke all-rounder Little shared a century stand with Leinster's Ava Canning (30*), but they fell away losing four wickets for ten runs with Waringstown leg-spinner Cara Murray taking a five-wickets haul.
Waringstown leg-spinner Cara Murray took five wickets
Alice Tector was unable to resume her innings, having retired hurt on 35.
The win gives the Dragons their first points of the campaign.