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Ive had a Yellow top D34 for comming up 2 years now, sits under the seat in my old suzuki, runs the fridge and power inverter thats all, gets charged buy a super cheap auto dual batery kit, and the car only gets used once a month, but the battery is always in tip top shape, and ive forgotted to turn the fridge off before and left it in the car running for 2 weeks, jumped in the car and checked the battery, seemed a lil flat, but started the car charged for half hour and the thing shows no signs of deteriaration, the thing is great for a second battery, It may not have a high discharge rate, but unlike the cheaper AGM deep cycles it will handle the abuse and beeing draided to an inch of its life and then charged back up weeks later and still keep powering away,
As far as a start battery goes, I run the big arse Amaron AGM battery, which also runs my 12000lb winch without a care in the world, so depends what your using the battery for, if i was running it for a second battery only id go the optima, as a primary battery you cant look past Amaraon!
best of both worlds, get one of each ;)
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well i ended up dropping a red top in, had to massage the battery lead ends a lil to get them to fit, but it fits.....
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... Also .... the yellow/blue tops can be recharged WAY faster than a traditional wet or calcium style battery .... so the yellow D31 (900cca) might only be 75A/Hr, but it recharges way faster than an equivalent calcium battery that the D2 runs.
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I've had one and wouldn't buy one again. I used to run mutliple amplifier car stereo and they just don't cut the mustard. I use an endurant marine battery MMF27-780 worth about au$150(nz$200) and they work very well.
Common opinion from most car audio forums i'm on is that the optimas are lucky to last a couple of years and are overpriced.
