My XM3s went from a good 6 hour run time down to 2.5 hours in about 20 months. The last month alone has seen 30 mins wiped off them.
I went with the Varta A4 models bought from a Czech supplier called [Battex.cz](https://Battex.cz).
Varta are a pretty decent brand of battery (although their consumer AAs suck), would not expect it from them.
I had an Optima red top in my 89 4runner and that thing lasted for 12 fucking years. Needless to say I bought another one.
fits perfectly in a NB
Just did that on my 19 gsw, no battery management extra thing to deal with, just the two connectors and obd11 for coding to fleece (not binary agm). Only issue I have is the battery blanket doesn't fit the bigger size.
I just replaced my dead Zenipower OEM cells with Varta 1254 A3. So far the battery life is exactly as specified by Sony. We'll see if the Vartas can handle the charging regime.
The older VARTA battery could only hold a charge for 15 - 30 minutes at the end. It has been in use since January 2020 and was out of use for 8 months in 2022.
ZeniPower battery could still hold a charge for a long time. Estimating 5-7 hours.
Stay away from optima batteries unless your car specifies an AGM battery because they can be very problematic.
my 2009 had an optima and it only lasted 2 years
I have only had poor luck with optimas
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