There is an interesting thread running over at MoDaCo which is worth to read. It's about the standby time of HTC's Voyager (aka Orange SPV E200, i-Mate Smartphone2) and I couldn't believe it when I read it first but it seems to be true:
The main battery drainer of the Smartphone isn't Bluetooth at all but it's the SD/MMC card you might use with your device. lutzh wrote:
86 % battery w/o card - 1 day, 3 hrs, 40 min left
85 % battery w MMC card - 14 hrs, 25 min left
85 % battery w SD card - 14 hrs, 24 min. left
All numbers taken from smartbatt plugin with an HTC Voyager with Bluetooth on!
I made the test myself last night and left the device switched on but removed the MMC card and while it usually left up to 3 bars on the next morning this morning it hadn't left a bar! 8O
So far I've recommended to install as much as possible applications on an external flash card to save storage space on the Smartphone itself but with the HTC Voyager it seems a better idea to install the apps on the device and not using a SD or MMC card to save battery and increase the standby time, which is much more important at all!
Hmmm... I'm a little bit clueless now and hope HTC gets this bug fixed soon!
Cheers ~ Arne
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