DWSG wrote: ↑
Sat Jan 02, 2021 8:29 pm
@sparkE , I’m on day 3 of a diy battery reconditioning of my Prius from a company called hybrid automotive who sells a kit of a charger, discharger and harness that attaches to hv battery . Same thing the refurbisher people do. Hopefully it works
Well, the "std", "traditional" Priuses had NiMH batteries. Some of the plug-in Priuses had NiMH and some had Li-Ion. The NiMH can benefit from a "recondition" cycling, the Li-Ion not so much. All that kit does is cycle the battery through several charge-discharge cycles. The other thing that the "refurbishers" (mechanics) do is identify any weak cells (lower capacity) and swap those out with higher capacity cells (which involves disassembling part of the car and at least part of the battery unit). The battery is only as good as the weakest cell. You should be able to look at the cell voltages and see if they are all the same using an OBD dongle/reader and an app on your cell phone. If they are all the same voltage when half empty or empty, then you don't have a weak cell. If you have a traditional Prius hybrid, you can drain the batteries by just getting on a road that allows you to drive 35-40 mph without stopping, let the gas engine turn off and use the electricity in your hybrid batteries (~ 1.5 kWh) to maintain speed.
If your Prius isn't the "plug-in" type, then that kit should help quite a bit. Using it every 2000-4000 miles should keep your NiMH battery "as good as it can be" (which isn't going to be 100%, based on its age).
Oh, and any BEV should be put on a trickle charger (for the 12V 'accessory' battery) once a month or so to insure good health for the lead-acid battery that "boots" your car's computer and runs all the accessories. Unless you routinely drive over an hour a day.