Bassat wrote in post #18319063
I can't speak to your direct question, but can provide my own 'charger' experience. I have a new Panasonic Ni-MH charger that came with an 8-pack of Eneloops: output is 1.5V, 300mA. I have an old Panasonic Ni-MH 'Quick-Charger': output is 1.5V, 550mA. I primarily use the new one, but if I need 8 batteries charged and don't have time to wait, I use the old one also. I've never noticed a difference.
I suppose I am forfeiting a bit of battery life every time I use the old charger. I have 20 Eneloops, and don't use the old one often. Eneloops are cheap. I don't worry about them.
- 'old charger' 550mA output
- 'new charger' 300mA output
Per Battery University on the topic of NiMH charging
"It is difficult, if not impossible, to slow charge a NiMH battery. At a C rate of 0.1C to 0.3C, the voltage and temperature profiles do not exhibit defined characteristics to trigger full-charge detection, and the charger must depend on a timer. Harmful overcharge can occur when charging partially or fully charged batteries, even if the battery remains cold.... If you want to improve battery performance with a low-cost charger, estimate the battery state-of-charge and set the charge time accordingly. Remove the batteries when presumed full."
You can apply an initial fast charge rate of 1.0C and then drop to trickle rate of 0.05C (the 0.1C trickle rate of NiCd is not good for NiMH).
So assuming batteries are 2100AHr rated,
- 550mA is 0.26C
- 300mA is 0.14C
It looks like the supplied chargers for both your old and new Panasonic purchases are designed to eventually cause battery life reduction, and repurchase of new battery sets.
What is better is to charge at an intial higher rate (up to 1C) and monitor Voltage and Temperature, and drop current to 0.1C for final top off, then drop to a 0.05C rate....use of a 'smart charger'.