Bundle: 4PCs 3500mAh 10A 18650 EASTSHINE E35U Flat Top Li-ion Batteries with Nitecore D4 Battery Charger 1. 100% Customer Satisfaction: 30 Days Free Returned or Refund, 5 Years D4 Charger Warranty, 18 Months Warranty Eastshine for E35U Battery, 12 Hours Reply about Customer Issues. 2. Excellent Compatibility Performance: NITECORE D4 operate well with batteries of almost all types: IMR / Li-ion / Lifepo4: 26650, 22650, 18650 18350 18490 18500 17670 17500 14500 10440 16340 RCR123; Ni-MH / Ni-Cd: AA AAA AAAA C. 3. Excellent Smart Performance: NITECORE D4s Integrated microprocessor automatically identifies battery types and selects appropriate charging voltage and current, automatically detects battery status and selects the appropriate charge mode: CC,CV,and -dV / dt. 4. Excellent for Opearation Mode Performance: NITECORE D4 offer maximum power without risk of overcharging for Ni-MH/Ni-Cd battery, Provide end voltage within safe limits for IMR battery, Design specail Lifeo4 mode, Introduce low current charging program for small capacity battery. 5. Buy Together: Get D4 Charger + 4PCs Eastshine E35U Bundle with Extra 4PCs 3500mAh Flat Top 18650 Battery(B01CHQ75AW) together, Can Save $4.95 with Code (COD4E35U).