The custom battery support on my Catrike Speed E-trike, and over a year of rough trail pavement, ruined the trike's 48-volt, 17.5 amp-hour battery's mount-to-battery electrical interface. I happened to have a spare 52v, 20ah battery, so decided to install it on the trike. The existing 48v controller in the trike's drive housing was rated for a maximum voltage of 56v, so I had to order an $85 (including shipping) 52v controller rated for 60v max (Max battery voltage at full charge is 59v). Took me 8 to 10 hours to accomplish the task. Had to lower the battery support, because the 52v battery Hailong Shark battery is over an inch taller than the 48v Hailong battery. That resulted in the chain rubbing on the support, so had to do some grinding on the aluminum support plate. Removed the drive from the trike to make changing out the controller easier. While I had the drive disassembled, lubed the drive gears on the right side of the drive with black moly (molybdenum disulfide w/graphite) grease recommended by drive vendor ECO Cycles.  
 
 
 
 
New controller prior to installation. Inserting the 3 large cables w/connectors in the small hole at the back of the motor/controller enclosure was a bear.                                                                                                                                
 
 
 
 
 
 
Installed controller                                                                                                                                              Installed battery. Very large and heavy (About 11 lb). I have it securely strapped down to hopefully lessen vibration                                                                                                                                                                            
                                                                                                                                                                         damage.
 
 

 
Installed a voltmeter to monitor battery voltage.

Quote from jrob_bent on Apr 11^th, 2022, 7:00pm:

 
Yeah, I'm liking it. Drive maintains high performance much longer than with a 48v battery.

Quote from jrob_bent on Apr 12^th, 2022, 8:35pm:

 
Jerry, I have the VLCD-5 display on my trike, so I have just 4 power levels. I'm staying away from ECO Cycles' Open Source Firmware (OSF) version of the Tongsheng drive (20 power levels), because they don't furnish a warranty with it.
 
ECO's OSF 750w, 52v drive probably puts out close to 1,000w at max battery charge voltage of 59v. A standard Tongsheng drive cuts assist at a 90 cadence. The OSF drive cuts assist at a 120 cadence. Assuming a trike with a 700c x 32 mm rear wheel and tire and a 58T chainring and 11T cassette gear, a speed of 50 mph is theoretically possible at a 120 cadence. Air resistance would be really high at 50 mph on an unfaired trike. Very doubtful an average rider could hit 50 mph. More likely to be achievable with an E-velomobile.  

17-May-22      TUE      Clown Ride

Didn't feel fast but it was, for a recumbent trike ride ON level 1 all the way. I would have estimated a full mph slower. Wind lighter than what it has been lately, and the high clouds made it feel perfect.
bike: CATRIKE 700; start time: 8:52; end: 11:55; avg:16.3; max: 25.1; climb: 840; miles: 40.27; mtd miles:515.81; ytd miles:3875.94
HIGH CLOUDS; wind: SE 8-17; start temp: 76; min: 73; avg: 82; max: 88; end: 88