I have a Husqvarna pressure washer that has an electric start powered by a 12v rechargeable battery. The battery is recharged using a power converter that plugs into a standard 120v AC outlet. The battery is only charging to 11.48 volts DC even after being connected to the charger over night. It won't turn the 3.5 HP engine over to start it with only 11.48 volts. Would it be unwise for me to connect my standard 12v battery charger to the posts of the sealed battery and put the charger on engine start mode to see if it will turn the engine over? I would essentially be bypassing the charging system so I don't see how that would be an issue but I'm unsure about the seal rechargeable battery being subjected to the amperage engine start mode might send to it. I thought about just retrofitting a stardard 12v lead acid lawn mower battery to it (I would have to modify the bracket/battery compartment). I've included a photo of the battery in the pressure washer... would the lawn mower battery be a better solution? No more often than I use the pressure washer I just don't get much life out of a the rechargeable batteries and their a little pricey ($75). Thanks for reading and I welcome your comments.