>The NPF 950 lithium battery is available, though, and has a rather high >(30+) watt hour rating. Has anyone out there tried this battery? Are they >huge? Sony's naming scheme for their lithium batteries seems to be NP-Fnc0 (e.g. for the NP-F950, n=9 and c=5), where n-3 is the number of 3.6v cells. So the NP-F530 has 5-3 = 2 cells, the NP-F730 has 4, the NP-F950 has 6. The cells are 2.5" long x .7" dia., i.e. about 4/3Af size, and are nominally 3.6v. Each pair of cells is connected in series to give 7.2v and then the pairs are connected in parallel. A PC board at one end and the plastic case add about .25" to the length and .1" to the height and width, making e.g. the NP-750 2.75" x 1.5" x 1.5". Haven't measured the NP-950 but on this theory it should be 2.75" x 1.5" x 2.2". No sign of an NP-F1150 yet but it would have the dimensions and amperage of two NP-F750's stuck together and connected in parallel. The c in NP-Fnc0 is either 3 (discontinued) or 5 denoting respectively 1.35 and 1.5 ampere-hours per battery. Multiply by (n-3)/2 to get the capacity of the whole unit, e.g. 1.5 * (7-3)/2 = 3 ampere-hours (= 3000 mAh, milliampere-hours) for the NP-F750. The AC-F750 by Ac-Delco is the same as Sony's NP-F750 in the above respects except it has 10% more capacity and is $5 cheaper, at least at www.batterybarn.com. No sign of an AC-F950, too bad. One way of reducing the profile of the NP-F950 for a wearable is to cut it open and distribute the 6 cells around your belt. If you preserve all the connections it will function electrically identically to when it's in its case. The PC board is a mite delicate so you'll want to give it some physical protection. Vaughan -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.ml.org
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