Recently I've purchased a 48Wh, 11.4V battery from Dell but I noticed the old battery used in my laptop is in fact at 62Wh, 7.6V. Upon some readings online, I came to realization that it is unsafe to replace a battery with different voltage. Interesting enough, the battery specification of Latitude E5470 on Dell official website is actually 62Wh, 11.4V, which confused me even more. I have never changed the battery before this. Can you please shed some light on this issue? Thank you.