You can try your friend's charger at your own risk, because the voltage is close ( 7.4 v and 7.2v batteries both have the same number of internal cells ), but Li-on batteries normally require a variable charging voltage specially designed for that particular battery.
22.
The current to maintain the charge is so low that some systems apply the pre-charge at all times other than when charging batteries, while more complex systems apply pre-charge as part of the starting sequence and will defer main contactor closure until the pre-charge voltage level is detected as sufficiently high.
23.
This limit eliminates the option of an automotive electrical system with a nominal battery voltage of because at low temperatures the charging voltage of the battery can attain Also, the price, weight and volume of batteries are influenced by the number of cells, which must therefore be kept to a minimum.
24.
By adjusting the duty cycle of the charging voltage ( that is, the ratio of the on / off times ), the amount of power transferred to a load can be more easily controlled, though this control can also be applied to the input current, the output current, or to maintain constant power.
25.
Batteries with a lithium iron phosphate positive and graphite negative electrodes have a nominal open-circuit voltage of 3.2 V and a typical charging voltage of 3.6 V . Lithium nickel manganese cobalt ( NMC ) oxide positives with graphite negatives have a 3.7 V nominal voltage with a 4.2 V maximum while charging.
26.
And, along with the good safety characteristics of LFP batteries, this makes LFP a good potential replacement for lead-acid batteries in many applications such as automotive and solar applications, provided the charging systems are adapted not to damage the LFP cells through excessive charging voltages, temperature-based voltage compensation, equalisation attempts or continuous trickle charging.
27.
As far as I'm aware any worry about'leaving the battery charging'is unfounded-laptops use a lithium type battery ( which are not far off fireworks as far as energy density goes )-thus they have built in electronics which prevents things such as overcharging etc . A full battery can be easily detected since the resistance ( at a given charging voltage ) rises rapidly once it is full.
28.
The main 50 / 60 Hz transformer used to convert between line voltage and battery voltage needs to provide two slightly different turns ratios : One to convert the battery output voltage ( typically a multiple of 12 V ) to line voltage, and a second one to convert the line voltage to a slightly higher battery charging voltage ( such as a multiple of 14 V ).
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