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Charging a small battery?
I have a bluetooth earpiece.
Its charger is the usual 120v wall-type charger with a cylindrical connector to the earpiece charging port.
The output is 4.75v and .55A
I would like to cut off the 120v converter box and connect it to a standard USB cable making it combatible with my phone charger, tablet charger - it would just be a lot more convenient.
As I understand it usb connections operate at 5v.
I would like to know if it would cause problems with the battery (or batteries) in my earpiece to charge at 5v instead of 4.75v.
At a 5% increase I wouldn't expect it to make a world of difference, but I'm not sure how a watch sized battery would react to a slightly higher voltage charge.
Thanks
I measured the voltage coming out of the charger and got 5.1-5.15 so I'm pretty sure it's going to work fine.
2 Answers
- ?Lv 49 years agoFavorite Answer
it is most likely regulated internally to under 4.75V as a single cell is usually 3.6V (Lithium ion) , the 4.75V spec sounds like it was designed for use on USB where the voltage can droop that low on a longish cable and the 0.55A max is just acceptable for the standard USB port spec limit.
on that basis i doubt any harm will happen if you stick a USB plug on the end of the charge lead.
if you are concerned then stick a small germanium diode (schottky diode) in series with the + feed as it will drop ~ 0.3-0.4V .
