2 Pack P100 Replacement 18V Ryobi Battery - Upgraded 3600mAh

Our review of the 2 Pack P100 Replacement 18V Ryobi Battery finds it best suited for homeowners and hobbyists who need longer runtime from their Ryobi compatible tools without paying for original-brand cells. The main reason to buy is the increased 3600mAh capacity, which delivers noticeably extended run time on drills, saws and sanders compared with many stock packs. Installation is straightforward and the pack fits P100 and P101 style mounts and P117 chargers, making it an easy swap when you need more working time for mid-length projects.

Key Features

• Upgraded capacity: The 3600mAh Ni-Mh cells provide extended runtime so users can finish longer tasks between charges.
• 18 Volt compatibility: Works with Ryobi 18V tools including drills, saws, vacuums and sanders for broad utility around the workshop or job site.
• Multi-pack convenience: Two batteries in the kit let you keep one charged while using the other for continuous work on longer jobs.
• Built-in protection: The replacement kit includes safeguards against overcharge, over-discharge, overload, over-temperature, overcurrent and short circuit to protect both battery and tool.
• Charger and fit compatibility: Designed to be compatible with P117 chargers and the P100/P101 battery form factors so installation is plug-and-play.

Who It's For

This replacement battery pack is a practical choice for DIYers, weekend remodelers and homeowners who use Ryobi 18V tools for intermittent to moderate-length tasks and want better runtime without the premium cost of OEM packs. The kit is also useful for small contractors who need an economical way to add battery capacity to their kit.

It is less suitable for users who require peak professional endurance under heavy continuous load or who insist on lithium chemistry for lower weight and faster charging; some users noted heat during heavy use and Ni-Mh chemistry is heavier than modern lithium alternatives.

Pros & Cons

Pros

• Higher 3600mAh capacity extends run time over many stock batteries.
• Good physical fit and compatibility with P100, P101 packs and P117 chargers for easy replacement.
• Includes multiple safety protections to reduce the risk of overcharge, over-discharge and short circuit.
• Two-pack offers value by providing a spare for continuous work.

Cons

• Some users report the batteries become warm under load and a few mention reduced charge retention compared with newer battery chemistries.

Specifications

Type	Ni-Mh
Capacity	3600mAh
Voltage	18Volt
Compatibility	Replacement for Ryobi 18V P100, P101; compatible with P117 chargers
Included	Two 3600mAh replacement batteries and a Battery User Manual
Protections	Overcharge, over-discharge, overload, over-temperature, overcurrent, short circuit

Our Verdict

For homeowners and hobbyists who need longer runtime from Ryobi 18V tools without an OEM price, this two-pack delivers solid value thanks to its upgraded 3600mAh capacity and good fit with P100/P101 style tools and P117 chargers. It is a cost-effective way to add backup power, though those needing the lightest weight or longest life under heavy professional use may prefer lithium options.

Frequently Asked Questions

Will these batteries fit my Ryobi 18V tools?
Yes, they are made as replacements for P100 and P101 style Ryobi 18V batteries and are compatible with P117 chargers, so they should fit common 18V tool mounts.

Are these lithium batteries?
No, these are Ni-Mh (nickel metal hydride) cells with 3600mAh capacity, which are heavier than lithium but offer reliable chemistry and built-in safety features.

Do they hold charge well in storage?
Most users report good performance in regular use, though some have observed reduced charge retention over time compared with newer lithium packs; store charged packs in a cool place to maximize retention.