A rechargeable cell loses capacity gradually with use, and that is normal — but check first whether the tool is simply working harder because the blade is dry or clogged.
The second cause is the one worth eliminating first, because it is free.
A blade running dry creates friction, and friction makes the motor draw more current. The runtime falls before the cutting does. Clean the blade, oil it if the maker requires oiling, and try again.
If runtime is still down after that, the cell has aged. No manufacturer on this site publishes a cycle count, so there is no schedule to compare against.
On most household tools the cell is not replaceable. Where the tool also runs plugged in — several clippers here do — a tired battery is an inconvenience rather than the end.
Check your own manual before you follow anything here. Temperatures, water ratings and supply voltages differ from model to model, and the maker’s own figures take precedence over anything written on this site. A supply of the wrong voltage is a failure rather than a slow charge, and the figure is printed on the tool — not inferred from a connector that happens to fit.
Last reviewed August 22, 2026