Finally a battery book that treats me like an engineer, not a shopper. I've been maintaining a fleet of 30 barcode scanners for four years and the chapter on understanding voltage sag was worth the price alone - I had no idea why my 'fine' batteries were killing the device's real-time clock. The glossary is a lifesaver on the workbench, too. The only downside is I don't work with any sealed prismatic OEM packs so the business chapter felt less relevant, but everything else was spot on.

The installation and troubleshooting chapters are solid, and I've already used the first-charge protocol on a couple of Palms I pulled out of a drawer. It's nicely written and the chapter on buying to replace was... fine. It gets a little dry when discussing cycle life and the trade coverage on the business side felt like it was written for someone with a lot more capital than me. But for a hobbyist just trying to keep three working units going, it did the job. I ended up bookmarking the spec table in Chapter 2, it's that useful.