From a PhD EE - The internal charge controller in these shavers seems to keep track of how much running time it can accumulate between charges before the battery voltage drops below 1.00v/cell. It will refuse to allow the shaver to start to run if either the battery voltage is low or the charge controller thinks it’s running time is depleted. This strategy for tracking the state of charge of a battery pack can’t track the self-discharge rate of the battery. When the shaver sits unused the battery self discharges and becomes depleted quickly setting a low running time. A very short time allows the shaver to be turned on just once between charges. Likewise when a battery is replaced the chip still retains the estimated life of the battery that was replaced. One way to get the chip to use a longer running time is to charge the shaver and start it and leave it running until it stops because the battery voltage falls too low then charge it fully.
From a PhD EE - The comment about a device designed for NiCd batteries being unable to charge NiMH batteries is incorrect, all of the charging strategies used for NiCd are equally effective for NiMH cells. The type of smart-charger used in this product delivers a rapid charge using a peculiar property common to both NiCd and NiMH batteries to terminate rapid charging and switch to trickle charging for a fixed time period before stopping completely. As NiCd and NiMH cells are charged the cell voltage gradually rises, but after it is nearly fully charged the cell voltage slowly falls. At this point charged cells start to heat up rapidly so the charge control IC switches to a low-rate charge for a fixed time before switching off all together. Heat was used by early 30 minute chargers for laptops and RC toys. NiCd cells tolerate heating better than NiMH in the sense that a 250 cycle NiCd and a 1000 cycle NiMH both last less than 100 cycles using a temperature terminated rapid charger.
Однажды Они, Вы смогут просмотреть график вашего рейтинга, накопленного за всё время.
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