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Jack

@jackcoder0

May 31

His iPhone battery health dropped to 78% after just 1 months of use.

He took it to the Apple Store expecting a free battery replacement under warranty.

The Genius Bar technician ran every diagnostic. The battery passed every test. The phone wasn't defective.

Then she said something he wasn't expecting:

"This battery isn't broken. It's been worn down. There are 8 default settings on your iPhone right now that are aging the battery faster than they should and they're all on by default. Apple ships every iPhone with them enabled. Most customers come in here thinking the battery is bad. It's not. The settings are."

He asked the obvious question: "Why doesn't Apple turn them off by default?"

She didn't answer.

She just opened Settings and started walking him through them.

Here's everything she showed him in the next 10 minutes. 🧵

The first thing she pointed at: Background App Refresh.

It was set to "On" for all 67 apps on his phone.

She explained what this actually does:

Every app on your phone is allowed to wake up in the background every few minutes — silently — to check for updates, sync data, pull in new content, and "stay ready" for when you open them next.

Most apps don't need this. Most users don't realize it's happening.

Every wake cycle costs battery. Every wake cycle generates heat. Heat is the #2 killer of lithium batteries, right after voltage stress.

The fix:

Settings → General → Background App Refresh → either turn it OFF entirely, or set it to **Wi-Fi only** and disable it for individual apps.

Apps that genuinely need it: Mail, Messages, your bank.
Apps that don't: Instagram, TikTok, every game, every shopping app, every social platform.

He disabled it for 54 of his 67 apps. Battery drain dropped 22% overnight.

The second culprit: Location Services running on apps that don't need it.

She opened Settings → Privacy & Security → Location Services.

He had 41 apps with location access. Of those, 17 were set to "Always Allow."

She listed what shouldn't have constant location access:

— Social media apps (Instagram, TikTok, Twitter)
— Shopping apps (Amazon, Target, eBay)
— Games
— Note-taking apps
— Photo editing apps

Every app with "Always Allow" is continuously pinging GPS, Wi-Fi triangulation, and cellular signal to track your location even when you're not using it.

This is one of the single biggest battery drains on any iPhone.

The fix:

— Set most apps to "While Using the App"
— Set very few (Maps, Find My, Uber) to "Always"
— Set none to "Always" unless you actively need them to track location in the background

He changed all 17 "Always" apps to "While Using." Battery life improved noticeably the same day.

Read 10 tweets

Jack

@jackcoder0

May 30

His android phone said it was ''out of space'' but he barely had any apps installed

128 GB of internal storage.

He had 24 apps. Maybe 800 photos. No downloaded movies. No music files.

The phone kept saying "Storage space running out."

He took it to a Samsung repair shop ready to trade it in for a higher-storage model.

The technician opened Settings → Storage and laughed before the customer even finished his sentence.

"Don't trade it in. Sit down. There are 7 things on every Android phone right now silently eating storage. Samsung, Google, OnePlus, Xiaomi they're all the same. Most users have no idea any of this exists."

Here's what he walked him through in the next 9 minutes. 🧵

The first culprit: "Cached Data" buried in every single app.

His cached data alone was using 19 GB.

Every Android app stores temporary files, images, thumbnails, page previews, video buffers to "make the app faster next time you open it."

The problem: most apps never delete this cache. Ever.

The technician pulled up the breakdown:

1. Instagram: 4.2 GB cached
2. TikTok: 6.1 GB cached
3. Chrome: 2.3 GB cached
4. Facebook: 1.8 GB cached
5. WhatsApp: 3.4 GB cached
6. Snapchat: 1.2 GB cached

That's 18.9 GB of "temporary" files the apps had no intention of ever removing.

The fix:

Settings → Apps → tap each app individually → Storage → Clear Cache

Or on Samsung phones: Settings → Battery and device care → Storage → tap each category → clear.

He recovered 17 GB in 4 minutes by clearing cache on his top 10 apps.

The apps still worked perfectly. They just stopped hoarding files.

The second culprit: WhatsApp Media, the silent storage killer.

WhatsApp on its own was using 11 GB.

Why? Because of one default setting every WhatsApp user ignores:

Auto-download media is set to ON.

This means every photo, video, voice note, GIF, and meme sent in any group chat you're part of gets **automatically downloaded to your phone, whether you watched it or not.

If you're in 8 family group chats, 3 work groups, and a few friend chats, your phone is silently downloading hundreds of files a day.

The technician showed him the fix:

1. Open WhatsApp → Settings → Storage and Data → Media Auto-Download
2. Set "When using mobile data," "When connected on Wi-Fi," and "When roaming" all to **No Media**

Then: WhatsApp → Settings → Storage and Data → Manage Storage → "Larger than 5 MB" → delete in bulk.

He recovered 9 GB instantly. WhatsApp still worked exactly the same.

Read 10 tweets

Jack

@jackcoder0

May 29

GEMINI HAS BRUTAL FEATURES MOST PEOPLE ARE NOT USING 🤯
99% of people still use Gemini for basic prompts.

But Google quietly packed it with tools that can research, analyze files, build custom assistants, create apps, automate tasks, and turn messy ideas into real outputs.

You’re probably using less than 10% of what Gemini can actually do.

Here are 10 hidden Gemini features worth using 👇🏽👇🏽

1. Deep Research

This is one of the strongest Gemini features.

Instead of asking Gemini one question and getting a short answer, Deep Research can break down a big topic, search across the web, compare sources, organize the information, and create a full research report.

Use it for market research, product comparisons, competitor research, content ideas, business reports, travel planning, buying decisions, and understanding complicated topics.

This is not “Google search with a nicer answer.”
This is Gemini doing the research process for you.

2. Gems

Gems are custom Gemini assistants.

Instead of using the same normal Gemini chat for everything, you can create a Gem for one specific job.

A content strategist Gem.
A fitness coach Gem.
A coding tutor Gem.
A customer support Gem.
A marketing assistant Gem.
A study tutor Gem.

You give it instructions once, then reuse it whenever you need that task.

This is how Gemini stops being a random chatbot and starts becoming a set of assistants for different parts of your life.

Read 11 tweets

Jack

@jackcoder0

May 26

🚨NotebookLM can now turn Articles, PDFs, and YouTube Videos into Structured Insights — like having an MIT researcher working alongside you.

Here are 10 prompts that will completely change how you analyze information 👇

1. Executive Summary (like a senior MIT researcher)

“Analyze all sources and generate an executive summary including:
→ Main findings.
→ Key insights.
→ Conclusions.
→ Practical implications.
→ Actionable recommendations.
Present the output in clear, professional language for an executive audience.”

2. Critical Insight Extraction (the ideas that change the game)

“Identify the 10 most important findings from the sources. For each one, explain:
→ Why it matters.
→ What evidence supports it.
→ How it can be applied in the real world.
→ What impact it could create”

Read 11 tweets

Jack

@jackcoder0

May 25

Last month, I had to learn an entire industry in 2 weeks for a client meeting.

50+ PDFs. 20 podcasts. 8 industry reports. Normally a month of work, minimum.

I did it in 3 days using NotebookLM + Claude.

Here are the 8 prompts that compressed the research:🧵👇

Prompt 1: Hand Claude the Real Question After NotebookLM Ingests

Most people ask NotebookLM their hard questions and get shallow answers.

The smart move: use NotebookLM as the librarian. Claude as the analyst:

I just used NotebookLM to extract the following
from [X SOURCES]: [PASTE NOTEBOOKLM SUMMARIES,
KEY POINTS, OR EXTRACTS]

Context for what I'm trying to figure out:
- The decision I'm trying to make: [DESCRIBE]
- What I already know: [LIST]
- What I'm trying to learn: [QUESTION]
- The deadline pressure: [TIMELINE]

Now do what NotebookLM can't: think with me.

1. The 3 most important insights buried in
these extracts (not topics — INSIGHTS)
2. The argument these sources are collectively
making — even if no single one states it
3. The contradictions across sources I should
resolve
4. The blind spot — what's MISSING from this
research that I should look for next
5. The 1 insight that changes my decision
6. The 3-sentence synthesis I could share with
a smart stakeholder
7. The single follow-up question worth ingesting
into NotebookLM next

NotebookLM gave me the library. Now help me
think.

Prompt 2: Build a Defensible Thesis From Scattered Research

Most research dies as scattered notes.

The 1% turn it into a thesis they can defend in a meeting:

Act as a senior strategy consultant who builds
defensible theses from messy research.

Here's what I've extracted from NotebookLM
across [X SOURCES]: [PASTE KEY EXTRACTS]

My working hypothesis: [WHAT I CURRENTLY THINK]
The decision this supports: [DECISION]

Build me a research thesis:

1. The CORE THESIS in one defensible sentence
2. The 3 strongest pieces of evidence FOR it
3. The 2 strongest pieces of evidence AGAINST
it (steelman)
4. The argument a smart skeptic would make
5. My response to that skeptic
6. The "confidence level" I should hold this
thesis with (60% / 80% / 95%)
7. The data point I'd need to flip my position
8. A 3-paragraph executive summary I could
send to a CEO

Don't make me sound certain. Make me sound
RIGHT.

Read 10 tweets

Jack

@jackcoder0

May 16

🚨Most people have no idea how powerful Claude has become.

It is no longer just an AI assistant.
It can now act like a researcher, strategist, analyst, editor, and operator all at once.

Here are 12 prompts that make Claude dramatically more useful for complex work:
(save this)

https://x.com/jackcoder0/status/2055347785185255736

1. Expert Problem Solver

Prompt
Act as a senior expert in [insert field].
I need help solving the following complex problem:
[Describe the problem]

Break the solution into the following steps:

1. Clarify the core problem
2. Identify root causes
3. Evaluate possible solutions
4. Recommend the best strategy
5. Provide an implementation plan
6. Highlight risks and mitigation strategies

Explain each step clearly and professionally.

https://x.com/jackcoder0/status/2055347785185255736

2. Deep Research Assistant

Prompt
Act as a professional research analyst.
Research the following topic:
[Insert topic]

Provide:

• Key concepts and definitions
• Current trends
• Important statistics
• Major players or companies involved
• Opportunities and challenges
• Future predictions

Present the findings in a clear, structured report.

Read 13 tweets

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