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Battery Comparisons - June 1999
The graph below shows the discharge curves for the LiIon camcorder battery types NPF750 (Sony); HL530 (equivalent to Sony NPF550); and the Motorola NiMH 5087 currently in use in the CyberJacket.
The NPF750 550mA curve was obtained with a 10 ohm (plus ammeter) load - a lighter load than the CyberJacket, but greater than that presented by the ShoppingJacket/BlazerJet/CyberBag.
The HL530 250mA and NiMH 200mA curves were both obtained with a 22ohm load.
The HL530 170mA curve was taken with a 32ohm load which gave a near identical power loading to the NiMH curve.
Typical loadings are shown in the table below.
Two NPF750's connected in series were chosen to provide power for the ShoppingJacket/Blazerjet/CyberBag. These provide sufficient battery life to enable meaningful trials to be undertaken in a package which fits neatly into a jacket pocket.
Maximum Output Voltage : 8.4 V Mean Output Voltage : 7.2 V Capacity : 21.6 Wh
Dimensions : 38.4 x 39.8 x 70.8 mm Mass : 200 g (7.1 oz)
CardPresso Load (with LocoMedia running)