Hi Tony Ive used my lithium bike battery on my HEQ5 only, Ive used for about 5 hrs with no probs so far and its super light and charges real quick, not bad price. Laptop is another story but could prob be jury rigged to work with its own battery. Tried a few Supercheap portable crank starters but their not really suitable. Hope this helps. chrz Brenton...
http://www.ebay.com.au/itm/SSB-Power...8AAOSwepJXWrIy