Zenless Zone Zero's Version 1.5 brings a critical double drop event for Routine Cleanup from February 7-12, 2025. With Battery Charge capping at 240 and regenerating 1 point every 6 minutes, strategic pre-farming maximizes event value. This guide covers daily regeneration management, Inter-Knot Level 40 preparation, and material priority frameworks.
Understanding Battery Charge System
Battery Charge caps at 240 points, regenerating 1 point every 6 minutes. This equals complete 24-hour restoration from zero to full, providing predictable resource planning.
Version 1.2 introduced Backup Battery Charge with 2400 maximum capacity. However, automatic regeneration stops once active Battery Charge exceeds 240, making daily consumption critical. Weekly natural regeneration totals 1680 Battery Charge.
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Daily Regeneration Rate and Cap Limits
The 6-minute interval creates 240 points daily through natural recovery. Daily coffee at Coff Cafe restores 60 Battery Charge (80 with Version 1.2's Tin Master Special). Combined with natural regeneration: approximately 300 Battery Charge daily without premium currency.
Ether Batteries provide 60 Battery Charge per use, available through Inter-Knot Level rewards at levels 15, 20, 25, 30, 35, and 40. New Eridu City Fund Basic Plan grants additional batteries at levels 5, 15, and 25.
Polychrome refills offer emergency restoration with maximum 8 refills per 24 hours. First refill costs 50 Polychromes for 60 Battery Charge, escalating to 75 for the second. By eighth refill: 900 total Polychromes for 480 cumulative Battery Charge—viable only during critical double drop windows.
Battery Charge Consumption by Game Mode
Combat Simulation: 20-100 Battery Charge depending on difficulty
Expert Challenge: 40 Battery Charge per attempt for targeted skill materials
Routine Cleanup: 60 Battery Charge per run—primary focus during February 7-12 double drop event
Notorious Hunt: 60 Battery Charge after exhausting 3 free weekly attempts
Hollow Zero: No Battery Charge required
At Inter-Knot Level 40, Routine Cleanup guarantees S-Rank Drive Disc drops, transforming it into the most valuable Battery Charge investment.
1.5 Double Drop Event Details and Timeline
Version 1.5 launches with Phase 1 Banners from January 22 to February 12, 2025, introducing S-Rank Ether Support Astra Yao with signature W-Engine Elegant Vanity. Phase 2 runs February 12 to March 3, 2025, featuring S-Rank Fire Attack Evelyn with W-Engine Heartstring Nocturne.
Advanced Bounty Routine Cleanup double drop event: February 7-12, 2025—6-day window for maximized Drive Disc farming.
Expected Value Increase
Double drops effectively halve Battery Charge cost per material. 60 Battery Charge Routine Cleanup runs become 120 Battery Charge equivalent value. For Inter-Knot Level 40 players with guaranteed S-Rank drops, this represents the single most efficient farming period in Version 1.5.
The 6-day duration allows:
1440 natural Battery Charge (240/day × 6)
360-480 from coffee
Total: 1800-1920 Battery Charge without refills
Translates to 30-32 Routine Cleanup runs, or 60-64 effective runs with double drops
Pre-Farming Strategy: 2-Week Preparation
Strategic preparation begins two weeks before February 7, focusing on Inter-Knot Level progression and Ether Battery accumulation. Players below Level 40 should prioritize reaching this threshold—guaranteed S-Rank drops dramatically increase efficiency.
Week 1: Account Audit
Review Drive Disc inventory: identify incomplete sets and needed main stats
Focus on Support agents (Energy Regeneration Rate), Attack agents (Crit Rate/Crit Damage), Defense agents (Impact/Anomaly Proficiency)
Calculate total Ether Battery reserves—avoid consuming before event
Stockpiling 5-10 batteries provides 300-600 bonus Battery Charge
If below Level 40, redirect all Battery Charge toward Inter-Knot experience
Week 2: Battery Charge Banking
Maintain Battery Charge at/near 240 cap during final week
Consume exactly 240 daily while collecting coffee rewards
Complete all 3 free weekly Notorious Hunt attempts before event (reset Monday 04:00 UTC+8)
Reserve Polychromes for event-period refills when double drop justifies expenditure
8 daily refills = 900 Polychromes for 480 Battery Charge
Material Priority Tier List
February 7-12 event exclusively affects Drive Disc farming. All other materials receive no efficiency bonus—farm outside event window.
S-Tier: Drive Disc Sets for New Agents
Astra Yao (Ether Support)
Swing Jazz (4-piece) for Energy Regeneration Rate
Freedom Blues (4-piece) for Anomaly Proficiency
Priority: Energy Regen Rate on slot 5, Anomaly Proficiency/Impact on slot 6
Evelyn (Fire Attack)
Woodpecker Electro (4-piece) for Crit Rate/Crit Damage
Inferno Metal (4-piece) for Attack scaling
Priority: Crit Rate on slot 4, Crit Damage/Attack% on slot 6
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A-Tier: Universal Sets
Hormone Punk (4-piece): Universal Attack% bonuses for most damage dealers
Puffer Electro (2-piece) + Thunder Metal (2-piece): Flexible Penetration Rate for various team comps
By Account Progression
Early-game (Level 1-30): Prioritize reaching Level 40 before event
Mid-game (Level 31-50): Farm universal sets like Hormone Punk for immediate roster improvements
End-game (Level 50+): Focus on min-maxing substats—target 3-4 optimal substats (Crit Rate, Crit Damage, Attack%, Penetration Rate)
Optimized Farming Routes
Routine Cleanup becomes exclusive Battery Charge target during February 7-12. Calculate total available Battery Charge for 6 days and commit entirely to this activity.
Combat Commission Efficiency Outside Event
Schedule Combat Simulation for February 1-6 (pre-event) and February 13+ (post-event). Skill materials receive no double drop bonus during Routine Cleanup events.
Expert Challenge's 40 Battery Charge provides targeted farming for new agent skill materials. Brilliant Overture event (January 22 to March 11, 2025) rewards 10 Encrypted Master Tapes; Before the Curtain Rises (January 13-29) provides 480 Polychromes.
Notorious Hunt Priority
3 free weekly attempts (reset Monday 04:00 UTC+8) = 180 Battery Charge equivalent without expenditure. Schedule during non-event weeks.
After free attempts, 60 Battery Charge cost matches Routine Cleanup. During double drops, Routine Cleanup's doubled efficiency makes it superior unless specific boss materials create immediate bottlenecks.
Daily Allocation Formula
Daily available Battery Charge: 240 (natural) + 60-80 (coffee) + 60× (Ether Batteries) = Total Daily
During 6-day event: Total ÷ 60 = Number of Runs (each provides double rewards)
With Polychrome refills: Add 60 per refill. Eighth refill's cumulative 900 Polychrome cost for 480 Battery Charge = 8 additional runs = 16 effective runs with double drops.
Common Mistakes to Avoid
Critical Error: Consuming Ether Batteries Before Level 40
Limited-availability batteries provide maximum value during double drop events at guaranteed S-Rank threshold—potentially doubling/tripling effective return versus premature consumption.
Misconception: Battery Banking Beyond Cap
Regeneration stops at 240. Can't save up natural regeneration beyond cap—requires daily consumption. Missing a day wastes 240 potential Battery Charge.
Backup Battery's 2400 maximum provides emergency reserves but shouldn't replace consistent daily farming.
Mistake: Farming Low-Priority Materials During Double Drop
Event exclusively benefits Routine Cleanup. Spending Battery Charge on Combat Simulation, Expert Challenge, or Notorious Hunt wastes double drop multiplier—effectively halving efficiency.
Error: Neglecting Inventory Management
Drive Disc inventory caps create storage pressure. Audit before event, dismantle suboptimal pieces. Maintain 50-100 empty slots.
Retention criteria:
Keep all S-Rank with correct main stats and 2+ optimal substats
Dismantle A-Rank unless perfect 4-substat combinations
Resource Calculator
Total available Battery Charge (February 7-12): (240 × 6 days) + (60-80 × 6 days coffee) + (Ether Battery reserves × 60) + (Polychrome refills × 60)
Example (10 Ether Batteries, no refills): 1440 + 360 + 600 = 2400 Battery Charge = 40 runs = 80 effective runs with double drops
Material Needs
Each agent requires approximately 12-15 optimized Drive Discs (4-piece set with correct main stats and competitive substats). Assuming 50% of runs produce usable pieces, 80 effective runs yield 40 potential keepers—sufficient for 2-3 character builds.
Players targeting specific substat combinations (Crit Rate + Crit Damage + Attack% + Penetration Rate) face lower success rates, potentially requiring 100+ runs for single perfect pieces.
Efficiency Metrics
Daily Routine Cleanup capacity during event: (240 natural + 60-80 coffee) ÷ 60 = 5-5.3 runs/day = 10-10.6 effective runs
Over 6 days: 60-64 effective runs baseline
Adding 2 Ether Batteries/day: 7 runs (14 effective), totaling 84 effective runs = 31% increase
Backup Plan
While February 7-12 appears in official announcements, maintain flexible strategies. If timing shifts, core principle remains: stockpile batteries and maintain 240 cap until confirmation, then commit fully during actual event.
Monitor official announcements from January 10, 2025 Version 1.5 Livestream (06:30 AM UTC-5) for final confirmation.
Advanced Strategies
Polychrome Refill Strategy
Free-to-play: reserve refills for final 2-3 event days after assessing results. Use premium currency only if specific Drive Disc gaps remain. Prevents wasteful early refills.
Coordinating with Shiyu Defense Reset
Shiyu Defense weekly resets provide Polychrome income for Battery Charge refills. Complete early in event week, immediately convert earnings into refills while double drop active.
Monday 04:00 UTC+8 reset means February 10 (during event) provides fresh attempts. Clear immediately, use rewards for 2-3 additional refills during final days.
Post-Event Management
After February 12, redirect Battery Charge toward skill materials and promotion materials. Double drop efficiency ends—Routine Cleanup returns to baseline while other activities maintain consistent returns.
Maintain reserve of 3-5 Ether Batteries for emergencies. Next Routine Cleanup double drop likely won't occur until May-June 2025 based on historical patterns.
Long-Term Planning
Version 1.5 establishes predictable patterns. Data Bounty Combat Simulation double drop scheduled December 24-29, 2025 indicates annual holiday events. Quarterly Routine Cleanup events suggest regular 3-4 month cycles.
Track Inter-Knot Level progression for consistent Ether Battery acquisition. Guaranteed batteries at levels 15, 20, 25, 30, 35, 40 = approximately 6 batteries total = 360 Battery Charge (12 runs = 24 effective runs during double drops).
New Eridu City Fund Basic Plan grants additional batteries at levels 5, 15, 25—increasing total stockpile for aggressive farming without premium currency.
FAQ
How much Battery Charge regenerates per day? 240 Battery Charge daily (1 point every 6 minutes). Adding coffee: 60-80 additional (80 with Tin Master Special). Total: approximately 300 daily without premium currency.
When is the 1.5 double drop event? February 7-12, 2025—6 days during Version 1.5 Phase 1, coinciding with Astra Yao and Evelyn banners.
Can you save Battery Charge for events? Active cap: 240 maximum. Regeneration stops above this. Version 1.2's Backup Battery stores 2400 overflow, but optimal efficiency requires daily consumption at 240 cap.
What is the Battery Charge cap? Active cap: 240 points. Backup Battery (Version 1.2): 2400 maximum for overflow. Automatic regeneration only functions when active Battery Charge ≤240.
Drive Discs or skill materials first? During February 7-12, prioritize Drive Disc farming exclusively. Skill materials receive no efficiency bonus—farm pre/post-event.
How to prepare for new characters in 1.5? Reach Inter-Knot Level 40 before February 7 for guaranteed S-Rank drops. Stockpile 5-10 Ether Batteries. Farm universal sets (Hormone Punk) or character-specific sets based on official kits.