Lookup Modec on Wikipedia it appears there were 3 types fitted,
Lead acid, lithium ion phosphate and Sodium Nickel Chloride
If yours has the last type stay well clear and fit something else. These are a molten salt battery and run hot. Again see wikipedia
Lead acid, lithium ion phosphate and Sodium Nickel Chloride
If yours has the last type stay well clear and fit something else. These are a molten salt battery and run hot. Again see wikipedia