Battery Chargers
RP4S RapidPro 4s
• **DISCONTINUED**ADVANCED LITHIUM BATTERY CHARGER
• CELL BALANCING TECHNOLOGY
• OVERCHARGE PROTECTION
• 4A MAX CHARGE CURRENT
• FAST AUTO CHARGE MODES
• Simple to operate: just connect the RapidPro 4s charger between a power source and a pack. No
jumpers, plugs or dials to set! Charger automatically determines pack capacity and sets optimal
current, then dynamically adjusts charge rate as needed. Manual charge rates of 0.25A to
4A (in 0.25A increments) allow for special situations.
• Charges Lithium Polymer, Lithium Ion, Lithium Manganese and A123© chemistries. Adapters
are available.
• Each cell is charged independently, providing exceptional charging safety and elevating RC
packs to the safety level of cellphones.
• Charges LiPo packs having one to four cells and any capacity up to 32Ah. Typical packs of up
to 4Ah capacity charge in 50 minutes or less using charger’s 2C Auto Current Mode.
• Multifunction display shows operating mode, individual cell voltages, charge current, supply
voltage, and amount of charge (mAh) put into pack. Plus, the unique Fuel display shows percent
capacity remaining in a pack.
• Viewer software (a free download) displays real-time data and graphs.
• Latest technology provides the ultimate in safety. Even charges packs having hidden physical
damage without danger of fire. A pack will not charge if individual cell voltages don’t equal total
pack voltage.
• Cell balancing to 10mV and automatic overcharge protection assure longest pack life. Automatic
temperature monitoring prevents pack overcharging at low ambient temperatures and
charger damage at high ambient temperatures.
• Low Voltage Restore feature automatically attempts to repair overdischarged packs. Cells discharged
as low as 0.5V may be repaired to as much as 98% of capacity.
• Cold Weather Charge stops charging at 4.10V/cell when temperature is below 55°F to prevent
cell damage.
• Operates from any 12–16V DC, 5A (minimum) power source. Inputs and outputs are protected
against reverse polarity.
Please note that Mains Adapter is sold seperately.
Battery type: Lithium Polymer, Lithium Ion, Lithium Manganese and A123 packs; charger can be used with 1s to 4s packs having node connectors and connected to charger with an appropriate adapter cable
Pack capacity: 250mAh to 32Ah (charge time limited to maximum of 8 hours)
Input voltage: 12 to 16VDC*, reverse polarity protected
Input current: 5A minimum*
Power conversion: 62.5kHz switcher operating at 90% efficiency
Nominal output voltage: 4.20 volts per cell for all except A123 packs 3.60 volts per cell for A123 packs
Output current: Up to 4A, reverse polarity protected; 3A on 4s packs
Number of cells (output): 1 to 4 cells in series
Cell balancing: To within 10mV
Voltage calibration: Cell voltage measurements are factory calibrated to a standard traceable to NIST; calibration is to ±6mV
Current calibration: Charge current is factory calibrated on a 4A standard; calibration is to ±6mA
Measurement accuracy: Voltage: ±10mV Charge current: ±1% Capacity added to pack: ±1% Percent capacity (“Fuel”): ±5%
Serial data output: 19.2kbps, 8 bits, 1 start bit, 1 stop bit, no parity