In my opinion, the OEM battery size and capicity is inadequate for the ST1300. It pays to get the most powerful and durable battery out there.
ST1300s are hard on batteries anyway, especially with the heat they put out and power needs for starting cold.
I have found that the best AGM replacement battery for them is the Power Sonic 230 CCA 12 AH from BatteryWeb.com, $92 delivered.
http://www.batteryweb.com/motorcycle-batteries-detail.cfm?model=PTZ14S
My last one lasted over 5 years. Got my new one Monday. I charged it up completely, THEN did TWO load tests, which it passed,THEN put it in the ST1300 and turned the switch on, it started instantly, cold. Ran the bike for five seconds, THEN shut off the engine and burned the high beams for two minutes.
The machine started instantly. Try this with a Scorpion and you will get nothing but clicks.
ST1300s are hard on batteries anyway, especially with the heat they put out and power needs for starting cold.
I have found that the best AGM replacement battery for them is the Power Sonic 230 CCA 12 AH from BatteryWeb.com, $92 delivered.
http://www.batteryweb.com/motorcycle-batteries-detail.cfm?model=PTZ14S
My last one lasted over 5 years. Got my new one Monday. I charged it up completely, THEN did TWO load tests, which it passed,THEN put it in the ST1300 and turned the switch on, it started instantly, cold. Ran the bike for five seconds, THEN shut off the engine and burned the high beams for two minutes.
The machine started instantly. Try this with a Scorpion and you will get nothing but clicks.