P108 BMS PCBA for Ryobi 18V ONE+ P103 to P108 Battery Packs

A pack that has stopped charging often needs its protection board replaced rather than new cells. This P108 BMS PCBA is a bare circuit board for 10-cell 18650 builds, specified for Ryobi 18V ONE+ packs P103, P104, P105, P106, P107 and P108. It suits repairers rebuilding a pack with their own cells.

A replacement board for rebuilding Ryobi 18V packs

✅ Rebuild instead of replace When a pack stops holding charge, the board can be swapped while the cells and housing stay, keeping it a repair.

✅ Made for ten-cell builds It suits a 10 × 18650 Li-ion pack, the cell arrangement of the Ryobi 18V models specified here.

✅ Six pack models covered It is specified for P103, P104, P105, P106, P107 and P108, so mixed packs can share one spare board.

✅ Charging protection on board The board carries the charging protection circuit for the pack, replacing the original when a fault or a rebuild leaves it unusable.

Nothing in the pack arrives assembled: the board comes on its own, without cells, and has to be built into a pack housing with a 10-cell 18650 group. That makes it a part for someone who already rebuilds packs rather than a drop-in battery.

PCB colour varies with stock, and the layout can change between batches while the function stays the same, so do not expect a visual match to the board you are removing. Fit it by the connections, not by the colour of the board.

Check the pack before ordering. The board is specified for the Ryobi 18V ONE+ models P103 to P108, and a pack from another range, or one built around a different cell count, falls outside that fit.

Fitting means soldering the board into the pack and testing the finished battery, so it is a job for someone with the tools and a way to check the result. On a pack that is otherwise sound, that is far less work than replacing the whole tool battery.

Technical details

• Model: P108
• Type: Li-ion battery BMS PCBA, bare board
• Compatibility: Ryobi 18V ONE+ P103, P104, P105, P106, P107, P108
• Cell configuration: 10 × 18650 Li-ion
• Function: Charging protection circuit
• Cells included: No
• Package contents: 1 × BMS PCBA board
• PCB colour: Varies with stock
• PCB layout: May change between batches, function unchanged

Match the board to your pack model, then rebuild the pack instead of buying another one.

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