Reention Black Eagle (Aventon Soltera) Battery — Compatibility Guide

The Reention Black Eagle is a slim 36V downtube case — most familiar as the battery on Aventon's Soltera line. If your Soltera's range has dropped, you don't have to pay Aventon's ~$500: aftermarket Black Eagle packs typically run well under that. But it is a different case from the 48V Dorado, so match carefully.

Schematic of a Reention Black Eagle e-bike battery case showing where to measure length, the connector, the voltage and model label, and the charge port. — Check these before buying a Black Eagle pack — measure the length first.

What decides fit

Voltage — Black Eagle here is 36V. Never cross it with a 48V Dorado pack.
Case length — owners report some Black Eagle packs are too long for the Soltera. Measure your original end-to-end.
Discharge connector — confirm the plug matches yours.
Removable vs integrated — confirm yours is a removable downtube pack.

Verified models in the Black Eagle family

Aventon Soltera.2 — Soltera.2 & Soltera.2 Step-Through
Aventon Soltera / Soltera 7 — Original Soltera (SS) & Soltera 7 (7S)
Aventon Soltera 2.5 / SR — Soltera 2.5 & Soltera SR

Don't confuse this with the 48V Reention Dorado used by the Pace and Aventure — that is the wrong voltage and the wrong case for a Soltera.