An updated overview of how cell phone chargers work: simple versus smart chargers, Li-ion CC-CV charging, fast-charge negotiation (USB-C/PD/PPS), connector standardization, and practical safety tips.
A concise update on Sony camera batteries: modern Li-ion packs (NP-FW50, NP-FZ100, NP-BX1), compatibility guidance, charging options including USB-C, care tips, and safety advice for today's mirrorless and video shooters.
Overview of cordless phones, modern battery chemistries (NiMH, Li-ion), compatibility tips, and practical advice for replacements and power-outage readiness.
Practical guidance on caring for and understanding IBM/Lenovo laptop batteries - what chemistries are common today, how to extend life, how to calculate watt-hours and runtime, and where to find replacements.