I use a regular wider blade screwdriver to remove caps. I then use a turkey baster and distilled water to top up, which I check every month. I put in a new MB battery earlier this year and the old one was the original...pretty long life compared to Autozone batteries I used to puat in my Jeep Gr. Cherokke. Only good thing about the Autozone was the 3 yr replacement warranty which I used 3 times in 6 years!

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95 E420 ( 76K) SOLD
85 380SE(125k)
95 SL500(72k)