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FROM THE DESK
I opened my flashlight during a power outage once and got about 30 seconds of dim, flickering light before it died completely. The batteries had been in there for over a year, slowly discharging. A flashlight with dead batteries is a tube. A flashlight with fresh batteries is a tool. The difference is a system for managing the little cylinders of energy that power half our preparedness gear.
Here's what I've got this morning.
THE BRIEF
Battery Management: The Boring System That Keeps Everything Working
Batteries power your flashlights, radios, walkie-talkies, headlamps, weather stations, smoke detectors, and remote controls. In a disruption, they power your lifeline to information and communication. Yet most households have no system for tracking, storing, or rotating them.
Standardize where possible. Choose one or two battery sizes for your emergency gear and stick with them. AA and AAA cover the vast majority of devices. If you're buying new gear, prioritize items that use these common sizes. Fewer battery types means simpler inventory.
Rechargeable batteries have matured significantly. Modern eneloop-style NiMH rechargeable batteries hold their charge for months (up to 70% after 5 years in storage), last for 500 to 2,100 charge cycles, and perform comparably to alkaline batteries in most devices. A 4-pack of AA eneloops with a charger costs about $20 and replaces hundreds of disposable batteries over its lifetime.
Store batteries correctly. Cool, dry locations away from metal objects (which can cause short circuits). Remove batteries from devices you won't use for extended periods, because even quality batteries can leak and corrode. Store alkaline and rechargeable batteries separately and labeled.
Rotation is the key habit. Every six months (align it with your seasonal kit swap from Issue 78), test batteries in all emergency devices. Replace any that test below 80% charge. Move those partially-used batteries to non-critical devices (remote controls, clocks) where their remaining charge is useful.
A battery tester costs $8 to $15 and tells you the charge level of any battery in seconds. This small tool prevents the scenario where you grab a flashlight in an emergency and discover dead batteries.
Keep a designated battery box or drawer. All fresh batteries go here. When you need one, you know exactly where they are. When you buy replacements, they go in the box. When you test and find weak ones, they go to the "use soon" section for non-critical devices.
For power stations and battery banks, the same principles apply. Charge them to 60% to 80% for long-term storage (full charge and full discharge both accelerate degradation). Top them off when you know a storm is coming or quarterly at minimum.
ONE THING THIS WEEK
Test the batteries in every flashlight and radio you own.
Grab each one, turn it on, and assess brightness. If it's dim, replace the batteries now. Dispose of dead batteries properly. Takes 10 minutes.
ON THE RADAR
NERC Flags More US Grid Regions at Elevated Blackout Risk Than Any Prior Assessment
NERC's May 19 Summer 2026 Reliability Assessment identified more at-risk regions than any previous report in the agency's history. Texas's far west zone, New England, and the Pacific Northwest all face potential supply shortfalls under extreme summer conditions. The driving force: AI data center electricity demand is outpacing new generation capacity. NERC added 58 gigawatts of new resources since last summer — but elevated risk remains for any heat-wave scenario with low wind output.
Source: NERC / Daily Energy Insider
LESSON FROM: JOEL LAMBERT
Joel Lambert's military career required meticulous equipment management. In A Navy SEAL's Bug-In Guide, he writes about the military concept of "preventive maintenance" applied to personal gear: the time to discover a dead battery is during a weekly check, not during the operation.
Lambert's system is simple: designated maintenance days. In the military, these are scheduled and non-negotiable. For civilians, he recommends monthly gear checks where you verify power levels on every battery-operated device. Lambert argues that a ten-minute check prevents a ten-hour problem. The discipline of regular maintenance separates reliable preparedness from a closet full of dead gear.
WHAT'S HAPPENING
Second Chinese Combat Patrol Buzzes Taiwan in a Week — 100+ Vessels Deployed Since Xi-Trump Summit
China's PLA conducted its second joint combat-readiness patrol near Taiwan in less than a week, with Taiwan's Ministry of National Defense tracking 29 aircraft — including fighter jets — and 7 warships. Twenty-four of those aircraft crossed the Taiwan Strait median line. Taiwan's National Security Council Secretary General Joseph Wu stated China has deployed over 100 vessels surrounding the island since the Trump-Xi Beijing summit ended May 15. Xi reportedly warned Trump the situation could lead to a direct US-China clash if "handled poorly."
Source: ZeroHedge, Al Jazeera
WHAT I'M TESTING
Panasonic Eneloop Pro AA Batteries (8-Pack with Charger)
I've been running eneloop Pro rechargeable AAs in my flashlights, radios, and headlamps for about a year. These are the high-capacity version (2,550mAh versus 2,000mAh for standard eneloops), and they hold about 85% charge after 12 months of storage.
The included charger handles AA and AAA cells and indicates charge level with LED indicators. A full charge takes about 4 hours. I charge a rotation of 16 batteries and swap them through my devices on a schedule.
The long-term savings are significant. At roughly $1 per alkaline battery, my 16 rechargeable cells have replaced about 200 disposables in a year. The environmental impact is a bonus. About $40 for an 8-pack with charger.
Budget alternative: Standard Panasonic eneloops ($15 for a 4-pack with charger). Lower capacity but lower cost, and the self-discharge rate is even better (retains charge longer in storage).
OVERRATED / UNDERRATED
Overrated: Stockpiling hundreds of alkaline batteries. They degrade in storage (losing 5% to 20% per year), they leak, and they're single-use. A set of quality rechargeable batteries with a solar-chargeable battery charger provides indefinite power for a fraction of the long-term cost.
Underrated: A battery tester. An $8 tool that tells you in two seconds whether a battery is full, half, or dead. It prevents the frustrating discovery of dead batteries during emergencies and extends battery life by directing partially-used batteries to appropriate devices.
THE LINK DUMP
Wirecutter: Best Rechargeable Batteries — Independent comparison of rechargeable battery brands and chargers.
Battery University — Technical resource on battery chemistry, storage, and maintenance.
Grokipedia: Battery Energy Storage Systems — Background on battery technology types and applications.
Call2Recycle.org — Find battery recycling locations near you.
NEXT ISSUE
The apartment prepper's guide. A complete framework for building significant preparedness in small living spaces.
PS: I now keep a battery tester on top of my battery box. Every battery goes through it before it goes into a device. Eight-dollar investment. Zero dead-battery surprises since.
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