AAh OK re Nicehash. Yeah I've had a play with it since your message. I was mucking around with an old Sony Vaio AIO PC with Radeon graphics - gets about 6 hashes a second. See Sony at https://zcash.flypool.org/miners/t1W1pBsaXuSoKddGuLbPkotprsz5awAsVPH

I have two full time miners at the moment

• one is an AMD 7870. It seems to get about 160 Hash/Sec on Zcoin.
• The other (card I actually bought) is an RX 460 which seems fairly slow, but has enough memory to mine Ethereum at 10 MH/Sec

I have a third card on the way from eBay - a Radeon HD 7850. Not sure what I'll get it to do yet.

I'm actually mining for heat and fun rather than making much money - I'm in a cold climate where we get down to freezing many nights over winter with tops 7-14 degrees c; so the waste heat is useful.

Re the Prospero X1 - would you be interested in selling one? I enjoyed having it as a novelty item up and running, and was sad when it got fried. I still have my old BFL 5GHz miner which also died.

PS - Great idea with the LiIon battery packs, glad they're all fused to 3A since they seem to be in parallel - there's a heap of potential current there if one shorted internally. I'd still be nervous having them near or in my house though since they can be unstable.