Comments about Rollei Rollei Rapid Charger f/6001/3/8:
this was one option - i bought a Rolleiflex SLX with a battery (but without a charger) - it was very hard to find one - some articles suggested a universal charger but i couldn't verify it would work without tinkering with the battery itself - no used units were available - this unit isn't cheap, but it is utterly reliable, durable, and perfectly compatible with the stock battery