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electronic-mcp-server: Skill for Claude Code

.github/skills/battery-selector/SKILL.md

battery-selector is a skill for Claude Code, Codex from wedsamuel1230/electronic-mcp-server. It costs 61 tokens per session (2,876 once invoked), scanned A, a copy of battery-selector, MIT.

A guide for choosing batteries and charging circuits for Arduino, ESP32, and RP2040 projects. It covers battery chemistry, voltage regulation, charging, and safety.

In plain words
What is it for?
Selecting a battery for a portable project, comparing rechargeable and disposable options, estimating runtime, and choosing a suitable charging setup.
Why use it?
It helps avoid choosing a battery with the wrong voltage, runtime, charging method, or safety requirements.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

This is wedsamuel1230/electronic-mcp-server's own configuration. It tells Claude Code and Codex how to work on electronic-mcp-server itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything electronic-mcp-server configures →

not rated 1repo 10mo ago A scan 61 tokens copy · 89% MIT
View source ↗ wedsamuel1230/electronic-mcp-server
Reuse

Borrowing it

Nothing to install: this file belongs to wedsamuel1230/electronic-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/wedsamuel1230/electronic-mcp-server/main/.github/skills/battery-selector/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/wedsamuel1230/electronic-mcp-server

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for battery-selector

README.md
[![agentmods](https://agentmods.dev/badge/skills/wedsamuel1230/electronic-mcp-server/battery-selector/github.svg)](https://agentmods.dev/skills/wedsamuel1230/electronic-mcp-server/battery-selector)
Your own site
<a href="https://agentmods.dev/skills/wedsamuel1230/electronic-mcp-server/battery-selector"><img src="https://agentmods.dev/badge/skills/wedsamuel1230/electronic-mcp-server/battery-selector/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for battery-selector

Your own site · 80×15
<a href="https://agentmods.dev/skills/wedsamuel1230/electronic-mcp-server/battery-selector"><img src="https://agentmods.dev/badge/skills/wedsamuel1230/electronic-mcp-server/battery-selector.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,876 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 89% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00061 $0.02876
Opus 5.5 $0.00024 $0.01150
Sonnet 5.5 $0.00012 $0.00575
Haiku 4.5 $0.00006 $0.00288

Measured 2mo ago against content hash ac2d94db1a84, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

battery-selector scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/compare_batteries.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

89% identical to battery-selector — 15 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.github/skills/battery-selector/SKILL.md · 439 lines

How it starts

The opening of the file, as written. The whole thing — 439 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Battery Selector

Guides battery chemistry and charging circuit selection for embedded projects.

Resources

This skill includes bundled tools and references:

  • scripts/compare_batteries.py - Battery comparison calculator with 15+ battery types
  • references/safety-guidelines.md - Comprehensive safety guide for all chemistries

Quick Start

Interactive selection:

uv run scripts/compare_batteries.py --interactive

Command line:

# Find battery for 50mA project, 24h runtime
uv run scripts/compare_batteries.py --current 50 --hours 24

# Require rechargeable
uv run scripts/compare_batteries.py --current 100 --hours 12 --rechargeable

# List all batteries in database
uv run scripts/compare_batteries.py --list

When to Use

  • "What battery should I use?"
  • "How do I charge this project?"
  • "Lithium vs alkaline?"
  • "Is this battery safe?"
  • Planning portable/battery-powered projects

Decision Flowchart

START
  │
  ▼
Is project rechargeable? ──No──► Alkaline/Lithium Primary
  │                              (Disposable batteries)
  Yes
  │
  ▼
What voltage does MCU need?
  │
  ├── 5V ──► LiPo + Boost converter
  │          OR 3x/4x NiMH
  │
  ├── 3.3V ──► Single LiPo (3.0-4.2V)
  │            Directly compatible!
  │
  └── 12V+ ──► Multi-cell LiPo pack
               OR Lead-acid
  │
  ▼
How much current?
  │
  ├── <50mA ──► Small LiPo (500-1000mAh)
  │             OR Coin cell (CR2032)
  │
  ├── 50-500mA ──► Standard LiPo (1000-3000mAh)
  │                OR 18650 cells
  │
  └── >500mA ──► Large LiPo (3000mAh+)
               OR Multiple 18650s
               External power recommended

Battery Chemistry Comparison

Quick Reference

Chemistry Voltage Rechargeable Energy Density Cost Safety
Alkaline 1.5V/cell No Medium Low Very safe
Lithium Primary 3V No High Medium Safe
NiMH 1.2V/cell Yes Medium Medium Safe
LiPo/Li-ion 3.7V Yes Very High Medium ⚠️ Needs care
LiFePO4 3.2V Yes High High Safer than LiPo
Lead-acid 2V/cell Yes Low Low ⚠️ Acid hazard

Read the full file on GitHub · 439 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 439 lines · 61 tokens per session scan A ac2d94db1a84

Subscribe to this mod's changes

battery-selector is a skill published in the GitHub repository wedsamuel1230/electronic-mcp-server (1 stars, last pushed 10mo ago), licensed MIT. It adds 61 tokens to every session and 2,876 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 89% identical to battery-selector, differing in 15 lines, and is treated as a copy.

Hardware and IoT
Related

battery-selector compared with skills from other repositories

battery-selector next to 6 skills from other repositories
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battery-selectorwedsamuel1230/electronic-mcp-serverSkill110mo agoMITA61Claude Code, Codex
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