I recently needed to replace my five year old Sears P1 AGM battery. The best replacement I found is the X2 Power SLI34-78AGMDP sold by Batteries Plus: https://www.batteriesplus.com/battery/c ... 34=78agmdp It is an AGM type, 880 CCA, five year warranty, and currently 10% off. It includes side terminals which might be useful for connecting accessories. It is manufactured by Northstar which looks to have a good reputation. The bright blue top looks good too!

I am getting much improved cold starts now.

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06 CRD Frankenlift, SEGR, Suncoast, Mopar lift pump, GDE eco tune
15 Jetta TDI/EA288

North Star AGM Batteries are very good and well made batteries! But they can be a bit pricey....
I got two of them; just put a new group 65 in my Jeep when I installed the Week's battery tray.
Pulse Cranking Amps 1,750 A
CA/MCA at 32°F 1,050 A

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve