I had been looking for a supply of batteries, to use for a HV IMA booster pack, like Mike has done. These Pb/acid came available recently at a low price, so I got a pallet of them. They are 12v 20 Ah capacity, and with acid-pac, weigh 15 lbs each. Not near as robust as the Trojan pack in Mike's Insight, but with my conservative driving style, an extra 15 or so Amp/hours (compared to the 4 available in the factory IMA pack), should do nicely on my commute. It will be awhile before I get started on this, as I am making myself finish another mod first.