If you are looking to buy a "used" battery, you actually have three distinct paths ranging from cheapest (but riskiest) to the most balanced:
1. Remanufactured & Reconditioned Packs (Highly Recommended)
: Opening your current dead battery and only replacing the specific failed internal modules (usually costing around $30 to $50 per module). This requires mechanical inclination and strict high-voltage safety knowledge. 🔍 Understanding the Different Used Options