"Although almost any type of charger will recharge a Marine/RV deep-cycle to some degree," notes Interstate, "short-term performance and long-term service life are directly proportional to proper recharging." This requires a charger specifically designed or set to match the voltage and current of the Nokia battery or battery pack. Modern "intelligent" chargers have settings for various types of batteries
(flooded or liquid electrolyte, Marine/RV, deep cycle, automotive, maintenance-free or AGM) and will reduce or taper the current (amperage) while regulating or monitoring the voltage.
It is important that the charger
* Matches, or can be set to match, the Battery for Nokia
voltage (6V, 12V, 24V, 36V)
* Provides correct charging amperage (Interstate recommends a maximum of 20A for each 100Ah of the Nokia battery rating)
* Have sufficient capacity to fully recharge the battery within eight to twelve hours
For best results,
* Select a charger that monitors and maintains the charge level
* Choose a maintenance-free charger with shut-off capability that either
o Shuts off after a specified time (timed charge)
o Shuts off when the Nokia battery reaches a full charge (voltage monitor).
A "trickle charger" (an inexpensive, low-current charger running at between one and four amps), will
* Sealed Lead-Acid Batteries for RV Use
* Deep Cycle Battery for Recreational Vehicles
* Sunforce 12V 1.8W Solar Battery Maintainer
* "lack the sophisticated electroniccircuitry to properly regulate currentor voltage"
* result in an extended charge time due to the low charge rate.
If such a charger must be used, Interstate recommends that the Wholesale Batteries
be monitored periodically for voltage level and temperature and charging stopped if the battery reaches 12.75V or becomes warm to the touch.