"A 4 cell charger is worthless"
I have this cool technology in my house called a power strip. It allows me to install multiple battery chargers in parallel, effectively allowing me to charge 4, 8, 12, or even 1,247 batteries at a time, all based on how many separate chargers I buy!
Think of it like a rack mount server with truly efficient multi-processor scaling.
FWIW, my family and I use a lot of (standard size) batteries, and have a total of two 4-cell chargers supporting us. Between low-self-discharge batteries (eneloops rule), reasonable organization (if 12 batteries need to be charged, 4 sit next to the charger and the chargee checks back to swap their set in the next day), and healthy supply of extra batteries (aforementioned chargee generally just grabs another set of batteries from the bin), it all just seems to work.
BTW, anyone looking for eneloop batteries, the best place I've found for them is Costco (and I just checked today to make sure they are still selling them). They sell a large pack of them, including a throw-away charger and more useful carrying case, for $26. That's $10 less than Amazon charges for the identical set, and you pay for the gas to/from Costco instead of shipping. For crying out loud: don't buy the $60 set of 8 batteries which Amazon seems to be hawking (alongside 4 batteries for $14 ...)!