People should remember a fully discharged battery is a mere empty vessel. For gaining negative charge, it would be necessary to plug it in backwards direction and allowing it to charge in that manner. The other possibility, though a rare one, is reversing the polarity after activation process. This means, for the positively charged battery to reverse itself, it would have to be fully discharged, and then the reverse charging can be applied. Technically, a battery can be charged negatively and used, but such a situation will typically result in a ruined battery. The major reason for this is incorrect formatting.
With the Young Energy’s chargers, this is no longer a cause for worry. In fact, your battery will continue to operate normally because of the fantastic anti-reverse function present in our chargers. We can assure you that the charger and battery will not be damaged at all, even when you accidentally plug the charger with the wrong polarity. Once you connect the battery in the correct manner, the charging will return to normal operation. So, even when you use an old style battery, and short the terminal by mixing up the wiring, or placing it in incorrect terminals, Young Energy’s chargers can save the day and make your life a lot easier.

Young Energy’s charger has detection function to check whether the battery and the charger is connected. When the battery is disengaged from the charger, the charger will shut down protectively. So when the charger is not connected with the battery, the charger cannot work, and the charger is not output.

Fully considering the international standards(UL 61058), the shell temperature of all series of full-seal chargers with no fan does not exceed 75℃. The actual test in the most extreme conditions: the 100VAC input, the maximum output power, 45℃ ambient temperature, shows the maximum shell temperature is about 70℃, meet the UL standards.

Absolutely not! We recommend that, where possible, you leave the charger plugged in and switched on, with the batteries connected, until you next need the battery for use.
There are several reasons for this. At the end of the charge cycle, when the green ready light is on, the charger is trickle charging the battery in constant voltage float/standby mode, nominally at 2.3 Volts per cell. This is the same charge method used for batteries in standby applications such as alarm panels or emergency lighting, where the battery is intended to be charged 24 hours a day, every day. At this voltage, the battery will not be gassing so loss of electrolyte is minimal. The charge current drops exponentially to a very low level, sufficient to maintain the battery in a fully charged state and to compensate for any self-discharge. Over time this low rate of charge will tend to equalize charge imbalance between the cells, which can extend the battery life.
By leaving the charger switched on, you will prevent any risk of damage to the battery from sulphation (which can be caused by allowing the battery to stand in the discharged state). The energy consumed in standby mode is minimal, typically about 10 Watts for a medium size charger, so one unit (One KWHr) of electricity is used every 100 hours, which costs about one and a half pence per day. The only exception to this recommendation is in cases where the battery manufacturer specifically states that the battery is not suitable for constant voltage float operation, or when running from an intermittent AC supply such as a generator.

A battery charger is a type of DC power supply unit (PSU) which is specifically designed for charging batteries. While any DC PSU can be used to charge batteries, there are serious potential pitfalls to using a generic PSU as a battery charger. For example, a DC PSU may include regulation circuits, which may be damaged if a battery is connected to the output, before the AC PSU is switched on. The regulation circuit in a power supply is not designed to reduce parasitic load and so may draw power from the battery if left connected when AC power is switched off.
These two issues can be addressed by adding a blocking diode, but then the volt drop of the diode (which is temperature dependent) needs to be allowed for. Generic PSUs do not provide multiple stage charging with different voltage limits, or temperature compensation of the charge voltage, or reverse battery connection protection. In general, it’s better to use a battery charger that was designed for the job, rather than a general purpose DC PSU, for battery charging. If using our chargers, there is no need to fit any external blocking diode or contractor to prevent current flow from the battery back into the charger, when the AC supply is off, as may be required with some generic power supplies.