FLEX "P-Set 18-88 R" XLITHIUM Battery Pack (18V) 1 Stück

FLEX P-Set 18-88 R Cordless Kit XLITHIUM — maximum capacity for FLEX high-performance tools in professional use

What is the FLEX P-Set 18-88 R? The FLEX P-Set 18-88 R is an 18-volt XLITHIUM battery kit with a powerful 8.8 Ah high-capacity battery pack and the matching FLEX charger — the premium battery kit for extreme continuous use with FLEX 18V high-performance tools.

When capacity counts and charging interruptions are not an option, the FLEX P-Set 18-88 R XLITHIUM is the answer. At 8.8 amp-hours, this battery pack is the most powerful element in the FLEX 18V system — designed for high-performance tools under continuous load, for long-haul polishing protocols without breaks, and for workshop operations where time literally means money. The XLITHIUM label at FLEX stands for high-performance cell technology, which enables this capacity value with professional reliability.

Compared to the P-Set 55 R with 5.0 Ah, the P-Set 18-88 R delivers almost double the capacity. This not only means longer runtimes but also a larger energy reserve for high-load situations — when the FLEX XFE 2-15 18 EC is running on paint with an abrasive compound pad under full pressure, it draws significantly more current than during a light finisher pass. The 8.8 Ah pack has the reserves for this situation — stable voltage, no power drop, no premature shutdown of the electronic protection circuit.

The P-Set 18-88 R includes the matching FLEX charger for XLITHIUM battery packs. XLITHIUM cells have specific charging requirements that a charger designed for this pack optimally serves — faster, gentler, and with longer preservation of cell properties than a generic charger or one designed for smaller packs. The kit is the complete, coordinated solution for the XLITHIUM segment.

• 8.8 Ah XLITHIUM battery pack — maximum capacity for extreme continuous use without charging interruption. With 8.8 Ah, the XLITHIUM pack delivers the longest runtime in the FLEX 18V system: on an orbital polisher at medium load, over 90 minutes of uninterrupted operation. This corresponds to a complete three-step protocol on a mid-range vehicle in a single charging cycle. For professional detailers who want to work through a vehicle from start to finish without battery pauses, the 8.8 Ah pack is the right tool.
• XLITHIUM cell technology — high-performance cells for stable power even under maximum load. The XLITHIUM technology in this battery pack stands for high-performance cells with particularly good properties under high current draw: stable internal resistance, low heat generation under load, high cycle stability. On high-performance tools such as powerful polishers or saws, the XLITHIUM pack shows its advantage over standard battery packs: no voltage drop under load, consistent power delivery until actual discharge.
• Incl. XLITHIUM charger — charging optimized for the 8.8 Ah pack for maximum service life. The charger included in the P-Set 18-88 R is designed for the specific requirements of the XLITHIUM battery pack. The charging algorithm considers the cell properties of the high-capacity XLITHIUM cells and charges quickly without stressing the cells with too high a charging current. This significantly extends the service life of the 8.8 Ah pack compared to charging with uncoordinated devices.

Practical tip from Detailing1: The FLEX P-Set 18-88 R makes sense if you polish many vehicles daily or use high-performance tools that heavily stress the battery. However, if you polish one to two vehicles per day with a normal three-step protocol, the P-Set 55 R in alternating operation is more economical and more comfortable in terms of weight. The 8.8 Ah pack is heavier than the 5.0 Ah pack — you feel this weight at the end of a long workday. For absolute high-performance professionals and workshops with extreme throughput, the XLITHIUM pack is the right investment; for the normal professional detailer, the P-Set 55 R offers optimal value for money.

XLITHIUM Technology — what 8.8 Ah capacity means in practice

The XLITHIUM designation at FLEX not only stands for a higher capacity number — it describes a specific cell technology developed for extreme requirements. XLITHIUM cells are designed to continuously deliver high currents without excessive heating or cell voltage drop. For professional tools that are continuously operated at full load, this is a relevant technical advantage.

What 8.8 Ah means compared to 5.0 Ah: not simply "more of the same," but a qualitatively different experience in continuous operation. A 5.0 Ah pack, operated under high load, reaches the critical discharge phase after about 45–60 minutes, where the cell voltage begins to drop. At this point, you often notice a slight but measurable power decrease in the tool. The 8.8 Ah pack, due to its larger cell reserves, has pushed this critical area further back — it remains in the optimal voltage range longer and delivers more consistent power over the entire period of use.

For paint correction with abrasive compound, this consistency is important: If the polisher runs under the pressure of a cut pad and the battery voltage begins to fluctuate, the speed of the orbital also fluctuates slightly. This manifests itself in an uneven cutting pattern — in some places, the device polishes more aggressively, in others more gently. With the XLITHIUM pack, the speed remains more consistent throughout the session, leading to a reproducible, professional cutting pattern.

Another aspect of XLITHIUM technology is heat generation. High-capacity cells that are discharged at high currents can heat up more than normal lithium-ion cells. FLEX has designed the XLITHIUM cells so that heat generation remains within an acceptable range even under maximum load. This protects both the battery pack and the power tool — and extends the lifespan of both components.

P-Set 18-88 R in use — for which tasks the XLITHIUM pack makes the difference

The P-Set 18-88 R is not the right kit for every application — it is the right kit for specific high-performance applications where capacity and consistency are crucial. These scenarios particularly benefit from the 8.8 Ah of the XLITHIUM pack.

Paint correction on heavily damaged vehicles: If a vehicle with deep swirls and holograms requires an intensive multi-step cut, the orbital polisher works under continuous high load. In this situation, the 8.8 Ah pack shows its advantage: stable voltage, consistent speed, no premature activation of the protection circuit. A detailer who continuously corrects a heavily damaged vehicle from hood to trunk appreciates the range of the XLITHIUM pack.

Complete vehicle paintwork with ceramic coating: If, after polishing, a ceramic coating is applied mechanically with a polishing pad, the polisher runs over the entire vehicle again. With a weaker battery, this second complete pass would require at least one charging process. With the 8.8 Ah pack, the entire coating pass runs without interruption — and for many ceramic applications, it is relevant to perform the work in one go.

Use on power-intensive non-polishing tools: The FLEX TL 4000 18 LED construction light, powerful FLEX angle grinders or saws draw significantly more current than a polisher under normal load. The 8.8 Ah pack supplies these tools with sufficient capacity for long uses — a 5.0 Ah pack reaches its limits faster with this class of tools.

P-Set 18-88 R charge management — efficient handling of the high-capacity pack

An 8.8 Ah battery pack charges slower than a 2.0 Ah pack — this is simply due to the larger amount of energy that needs to be transferred to the cells. The charger from the P-Set 18-88 R charges the XLITHIUM pack as fast as technically sensible and gently possible. The specific charging time depends on the discharge state: A full charge of a completely discharged 8.8 Ah pack takes correspondingly longer than with smaller packs.

For professional operation with the P-Set 18-88 R, we therefore recommend alternating operation with at least two packs: While pack 1 is running on the tool, pack 2 charges. The charging cycle of the 8.8 Ah pack is long enough that unavoidable waiting times arise without a second pack. Two P-Set 18-88 R kits or the combination of one 18-88 R with a 55 R as a second pack are the professional solution for uninterrupted daily operation.

The FLEX WHP-2 AC/DC Wall Mount Hook System is particularly recommended for charge management with the 18-88 R: Charge both packs simultaneously and store them neatly on the wall — the next working day begins with two fully charged XLITHIUM packs in the holders. For workshops that work intensively with FLEX 18V high-performance tools every day, this combination of P-Set 18-88 R and WHP wall mount is the professional standard.

P-Set 18-88 R vs. P-Set 55 R — when the XLITHIUM pack is the right choice

The honest assessment: Not everyone needs the XLITHIUM pack. The P-Set 18-88 R is the right choice for a specific area of use — and the P-Set 55 R is the optimal solution for the rest of the professional sector. The decision depends on the actual usage profile.

We recommend the P-Set 18-88 R for: workshops with very high daily vehicle throughput (more than 4–5 full detailings per day), use with power-intensive high-performance tools with high power requirements, detailers who choose maximum runtime without compromise out of conviction and value-for-money reasons, and as a third secondary pack alongside two 5.0 Ah packs for maximum rotation flexibility.

The P-Set 55 R is for: normal professional operation with one to three vehicles per day, alternating operation with two packs, ergonomically conscious work where the slightly lower weight of the 5.0 Ah pack makes a difference over the day. For the majority of professional detailers, the P-Set 55 R offers optimal value for money.

Buy FLEX P-Set 18-88 R — the premium battery kit for the most demanding professional

The FLEX P-Set 18-88 R XLITHIUM is the top model in the FLEX 18V battery system and is aimed at professionals who accept no compromises in terms of capacity and power consistency. It is the right kit for high-performance operation, for intensive vehicle throughput, and for anyone working at the absolute performance limit with FLEX 18V tools.

The kit contains battery pack and charger as a coordinated XLITHIUM system — no compromises in charging performance, no service life reductions due to incompatible chargers. Like all FLEX 18V battery packs, the 8.8 Ah pack is fully compatible with all FLEX 18V tools — the XLITHIUM capacity is available for the entire 18V tool portfolio.

Anyone starting with the P-Set 18-88 R starts at the top end of the FLEX 18V battery system. All smaller capacities are downward additions — but for starting with maximum reserve capacity, the XLITHIUM pack is a decision you won't regret.