Well 4.2v isn't 5v right? I entered iPOD wall charger into my browser and I got a ton of links to sites that seel ready-made chargers for as low as $7.95 US with others selling for under $10. That's hard to beat, knowing that you get a 3-year warranty on it and the connector meets factory spec. and the wires have molded on strain relief. Sometimes it's better in the long run to buy one ready made.
Hi,
From this topic, I have got a question. Is there any voltage regulator built-in in the mobile phone? Because I see some charger rated at 5 V, some 3.7 V.
Even if a phone is built to work within the possible voltage levels the battery can produce with a charge it still has to deal with being plugged into the wall, there has to be a regulator somewhere, either in the pack or in the phone.
If it's regulated from 5.0 volts down to the native lipoly's voltage the regulator might not be able to cope with 4.2 volts, the pack will never fully charge as th e regulator ceases to regulate.