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Identify RS187M-M43-PMB-2 before buying parts
Portfolio model RS187M-M43-PMB-2 is a two-pack solar path-light kit associated with item 0688480. The archived product record describes pearl metallic bronze fixtures with integrated LEDs, clear lenses and individual solar charging. Keep both the model and item number in your notes because manuals and resale listings may index one but not the other. This is not a transformer-fed low-voltage set, so a central Portfolio power pack is not part of the diagnostic path.
The original battery specification matters
Each light uses one 3.2-volt 250 mAh 14430 lithium iron phosphate rechargeable battery. That chemistry is commonly abbreviated LiFePO4. Match chemistry, voltage, size, polarity and rechargeable designation when servicing the battery. A physically similar alkaline or different rechargeable chemistry is not an equivalent substitute because the solar charging circuit was designed around the original cell type.
One light works and the other does not
A two-light kit gives you an unusually useful diagnostic control. Put both fixtures in the same full-sun location for a complete charge cycle, clean both solar panels, and compare them after dark. If one remains dead while its mate operates, the problem follows the fixture rather than the landscape location. Swap the rechargeable batteries only if both batteries are confirmed compatible and installed with correct polarity. If the failure follows the battery, the battery is the likely service item; if it stays with the housing, inspect contacts, panel, switch and internal electronics.
Both lights have short runtime
When both lights fade early at the same time, look for a shared environmental cause before assuming simultaneous electronics failure. Seasonal sun angle, tree growth, dirty panels, several cloudy days and winter temperatures can all reduce the energy collected during the day. Give the pair a controlled test after a genuinely sunny day in an unshaded location. If both still have poor runtime and the batteries are original or similarly aged, battery capacity becomes a stronger suspect.
Use the 6-hour and 10-hour modes as a diagnostic clue
The product record documents selectable 6-hour and 10-hour operating modes with different brightness behavior. If a fixture appears to shut off “too early,” confirm its selected mode before diagnosing a battery failure. A light that behaves predictably in one timed mode but not the other may still be charging correctly. Record the switch position and actual runtime over two nights rather than relying on a single observation.
Dusk-to-dawn sensor problems can look like battery failure
The fixtures use photocell control to turn on after dark. A light tested under a porch lamp, security light or bright window may interpret that illumination as daytime. For a meaningful test, cover the solar panel/sensor area completely or move the fixture into true darkness after it has charged. If the LED then turns on, the battery and LED may be healthy and the issue may be nighttime ambient light rather than a failed part.
Broken stake or mounting pole: save the working electronics
A broken ground spike is a mechanical failure, not a reason to discard a functioning solar head. Remove soil from the pole, measure its outside and inside diameters, record the insertion depth, and photograph the original spike profile. A compatible universal stake can be a sensible repair when the dimensions match. Loosen compacted soil before reinstalling; pushing or hammering the assembled fixture into hard ground is a common way to crack replacement stakes.
Rust, finish damage and water intrusion need different responses
The original fixture is described as stainless steel with a pearl metallic bronze finish and an IPX4 splash-water rating. Surface discoloration is different from water inside the electronics compartment. Clean exterior oxidation gently and avoid abrasives that strip the finish. If water repeatedly reaches the battery compartment, look for a damaged seam, displaced cover or crack. Corroded battery contacts can sometimes be cleaned, but severe circuit-board corrosion usually makes a donor fixture or complete replacement more practical.
Dim light after a full charge
The product was marketed around roughly 10-lumen output. If one fixture is visibly weaker than its mate after equal charging, clean the clear lens and solar panel first, then compare batteries. A hazy lens reduces delivered light without changing LED output. A tired battery may allow the LED to start normally but sag quickly. Because the LED is integrated, replacing a consumer bulb is not the normal repair path.
Replacement shopping: match more than the bronze finish
If the electronics are beyond repair, record the original approximate 5.7-inch width, 12.98-inch height, warm-white appearance, solar power source, dusk control and two-light spacing before shopping. A replacement can be electrically independent yet look wrong beside surviving originals because of height, lens shape, color temperature or brightness. When only one original survives, replacing the pair may produce a cleaner visual result than mixing generations.
Do not convert this solar model to a transformer system by accident
RS187M-M43-PMB-2 does not need a Portfolio low-voltage transformer. If you decide to replace the solar pair with wired low-voltage path lights, that is a system conversion requiring cable routing, transformer sizing and connector decisions. Use the site’s low-voltage guides for that project rather than treating a wired fixture as a direct drop-in part for this solar model.
Build a small service record before discarding a failed light
Write down which light failed, battery voltage/chemistry printed on the cell, whether the failure follows the battery, hours of direct sun, selected runtime mode, and whether the light responds in complete darkness. Those observations turn a vague “solar light stopped working” complaint into a repeatable diagnosis and help avoid replacing a good housing because of a worn rechargeable cell.
Related Portfolio repair resources
Use the Portfolio solar lighting guide for broader solar diagnosis, the model parts directory for exact-model research, the manuals library for surviving documentation, and the landscape lighting hub for mechanical and placement issues. If you are considering a wired replacement, continue to the Portfolio low-voltage lighting guide before buying fixtures.
Use the surviving mate as your parts template
If one fixture is damaged beyond repair, do not discard the second light before recording dimensions and construction details. Measure the ground spike, mounting pole, lens diameter, top-housing diameter and battery compartment. Photograph how the lens and pole lock together. Those measurements can identify a compatible donor or universal mechanical part even when the original Portfolio replacement number is unavailable. Keeping the working fixture intact also gives you a reference for correct battery polarity, switch position, brightness and nighttime behavior after a repair.