The battery charger (1) has a rechargeable battery (2). Temperature (T) is measured. A low current charger at a constant voltage (8) provides the charge current. The charge current is set below a temperature dependent level providing a low current.

The method involves passing an effective charging current through each of at least 2 cells connected in series for a charging period in a charging cycle and passing a lower refresh current in an at least occasionally following refresh cycle. The refresh cy...

The method involves measuring the time taken for the battery voltage to fall to a threshold value after fully charging or replacing the battery. The measured discharge time is compared with a reference value and the battery is fully discharged if the measu...

A power charger which charges and provide conditioned power from at least one of a super-capacitor and a secondary battery. The type of energy device is user selectable, such that the user can select super-capacitors because of their much longer charge/dis...

The invention relates to a battery discharger comprising a controlled switch (46) which is conductive for discharging a battery when the voltage of this battery is greater than a first reference voltage (Vr1). The controlled switch is periodically opened a...

The invention relates to a battery discharger comprising a controlled switch (46) which is conductive for discharging a battery when the voltage of this battery is greater than a first reference voltage (Vr1). The controlled switch is periodically opened a...

A method for charging a lead battery is provided. In the method, a SOC is controlled so as to be less than 100%, and when the lead battery has not been charged and discharged for a predetermined time, refresh charge is performed so that the SOC becomes at ...