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.
curl -O https://raw.githubusercontent.com/wedsamuel1230/electronic-mcp-server/main/.github/skills/battery-selector/SKILL.mdgit clone --depth 1 https://github.com/wedsamuel1230/electronic-mcp-serverWrote 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.
[](https://agentmods.dev/skills/wedsamuel1230/electronic-mcp-server/battery-selector)<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.
<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>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00061 | $0.02876 |
| Opus 5 | $0.00030 | $0.01438 |
| Sonnet 5 | $0.00012 | $0.00575 |
| Haiku 4.5 | $0.00006 | $0.00288 |
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 10d ago.
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.
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.
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 |
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.
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.
- 10d ago First seen · 439 lines · 61 tokens per session scan A ac2d94db1a84
battery-selector is a skill published in the GitHub repository wedsamuel1230/electronic-mcp-server (1 stars, last pushed 8mo ago), licensed MIT. It adds 61 tokens to every session and 2,876 once invoked, about $0.0003 per session on Opus 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.
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