After much investigation years ago I decided to go with Powerex from Maha.
MAHA / POWEREX MH-C204W 1-Hour Worldwide Travel Conditioning Charger
Been using them for years (dedicated to my audio recorders) without one hiccup. I make sure I drain them completely with cassette units before recharging.. nothing like motors to really run down the cell to zero.
I tested the MR1000 with them when I first got it and after 3 hours it was still going strong.
Good luck.