So it turns out that no-one on the internet seems to know how to open the new Ryobi batteries. You know, for repairs and stuff.
I have one that, er, sort of got left in the rain, and stopped working.
To open it, you’ll need to get a Torx anti-tamper driver, size whatever fits. Undo the corner screws on the base, then the one on the top of the neck. Now, it still won’t open.
Press in the battery release button, and jam a small crowbar or large screwdriver, and carefully lever the tool upwards. There is a concealed tab that sticks downwards off the black upper section, just to the front of the battery release catch. I had no problem getting it to release nicely.
Repeat on the other side.
Now, as you pull the two halves apart, you sort of need to bring the two battery release catches with it. They just slide up, then pop out.
Obviously you’ll want to take care. It’s a lithium pack and it put out well over 20A when I tested it. In fact, it blew the tip off the probe!
It consists of 5 18650 cells, and a load of circuitry, mostly for charge management. My 5 cells were all within 0.02 volts of each other, so clearly it works.
To re-assemble, line the release clips up first, then slide it back together, and replace the screws.