In order to meet the charging requirements of most batteries and prevent the battery from bursting, the output power of the universal charge is appropriately reduced, and the direct charge is dedicated, so the best output is used. That's why it's fast.
Mobile phone battery charging, should not use universal charger, universal charger on the market is good and bad, some have no charging protection device, so in use, a little mistake, it may be due to overcharging, the battery charge drum, so that the battery standby time is greatly shortened, or the battery scrap.
The universal charger you buy, the output voltage is not consistent with the Nokia charging input voltage (generally high), so the board is broken, because the board has been broken so the original charger is not supported. It is recommended to use the original charger to charge, most of the domestic universal charger in order to reduce costs and use inferior, sub-quality components and reduce some necessary protection circuits for no reason, and then use it as a last resort!