Thats awesome you got long time from your battery !!! . . . amazing what can happen when the battery is kept 'topped' up (charge wise), and topped up liquid wise too (I use distilled water) - that is if you can pop the caps off and check the fluid level in the cells. My MB I bought in 2015, the shop said the battery "should be replaced" . . . lol, thanks. I have kept the battery maintainer on it when not driving car, and it battery lasted til last fall !!! . . . nine years out of a "bad" battery - damn good !!! lol . . .