[dcbrown]

Attached MK ES17-12 battery spec. Previous battery had max discharge of 230A for 5 seconds -- new battery is listed as 720A for 5 seconds! Zonks! That's really dumping power quickly! Same 18Ah rating as previous battery.

I haven't compared the derating associated with various levels of discharge curves yet, but anything at or over 20A will drop the available power to only 8Ah or less but it doesn't fall off much more from there up to a 50A draw down rate. It appears that anything close to 50A steady state will last one or maybe two matches. But I also note that if we discharge this battery to 100% of depth then we're only looking at some 100 cycles before the battery won't retain full capacity at charge.

Of maybe interesting note, I quickly threw the battery back on the new charger which is same model as previous years. After even 5 minutes you could easily measure the effect of surface charge. It measured 13.8v off the charger. We pushed the battery through a 50A load for 15-20s and the voltage dropped back into the "nominal" range of 12.7-12.8v which is what a fully changed AGM battery should read w/o surface charge. A suggested method of removing surface charge is 3CA (3*18=54 in this case... 50A was close enough) for 15-30 seconds depending on which document you read followed by a 10 minute rest period.


Bud