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From there you can press the ENTER button once to display the data from the charge process, as
well as use the +/ – buttons to scroll through other screens, including the screen that features the
Battery.IR function to check the Internal Resistance (IR) of the battery and/or individual cells by
pressing the ENTER button (while on those screens). Or, on most other screens you can press the
ENTER button to exit the charge process completely.
Charging LiPo Batteries for use in Series on Separate Ports
The dual port flexibility and convenience of the TP820CD makes it an excellent choice for charging
LiPo batteries up to 8S 29.6V separately on each port for use in series up to 16S 59.2V in large-scale
airplanes, helicopters and other applications. Other popular examples include charging 5S and 6S
4400-5000mAh batteries for use in series as 10S and 12S setups in F3A, F3C and 3D helicopter
applications at rates up to 4C for charge times of as little as 15 minutes or less.
Charging each battery that will be used in series separately on each port is quick and easy to do.
Simply connect one battery to each port and set them to charge at the same rates. And while in some
cases there may be slight variations in the time it takes to charge each battery (meaning one may
finish charging before the other), because the two ports are calibrated very closely, the batteries
should be charged to almost exactly the same level which can also save substantial time over having
the two ports attempt to charge/balance together simultaneously.
Also, due to potentially slight differences in the condition/performance of each battery, we suggest
checking to ensure that both batteries are charged to within approximately 0.05V (or less) after the
charge process is complete for each. From there the batteries are ready to use in series, and we
suggest, as with all LiPo batteries, to discharge no more than 80-85% capacity to ensure maximum
performance and longevity.
Charging Split LiPo Batteries up to 16S on Separate Ports
The dual ports of the TP820CD are also an excellent choice for charging ‘split’ batteries that feature
interconnect leads (for transport/shipping as non-dangerous/non-hazardous goods when the leads are
left disconnected) up to 16S 59.2V. The split/interconnect configuration of most of these batteries
allows them to be charged as two lower cell count batteries. For example an appropriately configured
10S split battery with interconnect leads, such as all Thunder Power RC G4 and G6 10S 3300-
5000mAh batteries, can be charged as two separate 5S batteries. And in the case of 10S 5000mAh
split batteries in particular, you can charge each 5S ‘half’ on each port at rates up to 4C for charge
times of as little as 15 minutes or less for the complete 10S battery.
Using the dual ports of the TP820CD to charge split batteries requires only a few additional
accessories and setup steps to make it relatively quick and easy. And using a Thunder Power RC
10S 5000mAh battery equipped with the factory-installed 4mm bullet connectors on the interconnect
leads and a female Deans Ultra Plug connector on the main power leads as an example, the following
accessories are required (as shown in the photo below):
10-14 AWG charge lead with a male Deans Ultra Plug connector; 1pc
10-14 AWG negative charge lead with a male 4mm bullet connector on both ends; 1pc
10-14 AWG positive charge lead with a male 4mm bullet connector on one end and a female
4mm bullet connector on the other end; 1pc
TP6P10E (6-Pin Balance Connector Extension w/10" Color Coded Wires); 2pcs (OPTIONAL)
