The test set is unusually clean by drop-in battery standards: twelve Battle Born 100Ah batteries purchased 12 December 2017, all on one inverter in a single indoor, air-conditioned off-grid system run by one family, each battery never charged or discharged above 15A, never exposed to vibration or temperature extremes. Prowse says all twelve are still inside their warranty period, and has published the raw test data for download.
In the first video (9 July), capacity tests at 99A, 75A, 50A, and 25A returned 26.8–60.2Ah across all twelve packs — against a 100Ah rating and a warranty threshold Prowse cites at 80% retention. Two of the four batteries tested at 99A overheated at a terminal, melting plastic; one case cracked open. Notably, internal-resistance readings looked close to spec on most units — only the capacity test exposed the degradation.
In the follow-up (13 July), titled "Final Battleborn Video," Prowse disassembled two batteries down to their welded parallel cell packs. All eight packs measured 13–70Ah individually. Breaking one pack apart cell by cell, he found 73% of the cylindrical cells at 0V, with the surviving cells delivering roughly half their rated capacity and, on a thermal camera, taking essentially all the current. His hypotheses — factory cell mismatch causing current-sharing problems across the nickel-strip interconnects, plus plastic creep loosening bolted internal connections over time — are his own; he says he'll send units to a laboratory for verification.
The context matters: Dragonfly Energy is suing Prowse for trade libel, alleging his earlier testing was out-of-spec and misleading, and these are the defendant's own published results from a single 12-battery system. Treat them as one documented, downloadable dataset — not a verdict. Owners on DIYSolarForum have begun posting their own capacity results from aged Battle Borns in a thread that is already 11+ pages deep (see Community Pulse).
