In most applications, batteries are installed in an upright position, but in some situations there is a need to tilt them (sometimes at very extreme angles) or lay them completely flat on their backs.
Conventional "wet" style batteries should never be mounted in any orientation other than upright since there is liquid electrolyte that could escape the battery. Maintenance-free, absorbed glass mat (AGM) style batteries offer more flexibility regarding mounting angles because the electrolyte is absorbed, not flowing freely. Different battery models have different limitations regarding mounting angles. For questions pertaining to specific batteries or specific vehicle applications, please contact Yuasa Battery.