Looks good craig but i'd be a bit concerned by this review;

Dont be fooled by cheap price. 50pcnt of the packs they send out are DEAD ! This makes the third time i have tried the lifepo4 Zippy packs no more

Im also told hobyking's customer support can be a bit iffy when it comes to returns. Might be worth seeing if you can buy direct from the supplier and cut out the middleman.