Are there charging stations or electricity at the Mount Rinjani crater rim campsites?

No, there is no electricity for guests at the crater rim campsites, and there are no charging stations anywhere on the mountain. The solar panels you may hear about at Plawangan Sembalun belong to the park’s eco-toilet facility, and they power that building, not a bank of sockets for trekkers. Every recharge for your phone, headlamp, or camera must come from batteries you carry up yourself.

The planning standard is a power bank of roughly 10,000 to 20,000 mAh for a three-day trek. That covers three or four full phone charges after conversion losses, which is comfortable for photography, offline maps, and messaging whenever you cross a signal pocket. Keep the bank warm, because rim nights drop toward the single digits Celsius and cold measurably drains lithium cells, so sleep with it inside your sleeping bag or jacket rather than in a tent pocket. Put the phone in airplane mode, since a phone hunting for signal through the forest burns more power than its camera does, and bring the cable, which is the single most forgotten item on this mountain.

Phone signal is a separate question from power, and it deserves its own plan. Coverage at the rim is patchy, with better reception on some exposed sections and dead zones in the valleys and lower forest, so what you get depends on your carrier, handset, weather, and exactly where your tent is pitched. Do not build your safety plan on a bar of signal appearing when you need it.

That is why we run a check-in routine instead: our guides report positions to our office and to the park through agreed times and methods, and guests’ families get a defined contact plan before the trek starts, so nobody at home is refreshing a silent phone at midnight. Carry your own power, agree the communication plan in advance, and treat any signal you find on the rim as a bonus rather than a lifeline.