If you did not register your battery with Ridgid at the time of purchase there is a good chance they will NOT warranty them. Ya thanks for not telling me that Home Dept when I bought a combo kit. Anyway you can get these for about half what the Ridgid ones cost.

FYI: You can charge these on any Ridgid charger that charges lithium batteries. Here is one if you don’t have one.

This is a dual chemistry battery charger by the way. It will charge both NiCd and Lithium batteries, Ridgid or other brands.

Here is a two pack alternative battery if you cannot get Ridgid to warranty your non registered Ridgid battery.  Here are some specs on these non Ridgid batteries.

• Condition: Brand new Sub-Type: Replacement Battery Voltage (V): 18V Wattage: 90W Item Weight: 680g
• professional lithium battery for Ridgid 18V lithium battery R840087, R840083, R840085, R840086, AC840089, AC840085, AC840086, AC840087P Series.
• Works Fine: fit RIDGID 18V Lithium system of cordless drill tools, works with Ridgid 18-Volt lithium battery charger R86092.
• Fade-free Power: over 500 cycle times, high capacity 4.0Ah lithium battery 18V, long lasting/ more run-time and powerful in working
• Helper Design: with on-board fuel gauge, integrated LED battery charge level indicator allows user to monitor battery using. Built-in integrated microchip prevents overcharging and self-discharge.

18V Lithium Ion Replacement Battery Compatible with for RIDGID R840083 R840085 R840086 R840087 R840089 AC840085 AC840086 AC840087P AC840089 Series Drill Battery (2 Pack)

Click Here to Buy from Amazon

Let us know how they work for you.