seems we have a real battery expert on board ... thanks for weighing in. yes your comment about BMW folks wanting a real 18amp hour battery is dead on. thanks for verifying my comment about it's not possible for a real 18amp hour battery to weigh only 2lbs. that's why a 20 amp hour lithium iron phosphate battery that weighs 6.5lbs is en-route. an external overcharge protection circuit will be used to prevent unlikely event of a battery fire. while lithium iron phosphate chemistry is extremely safe... there's several fires on record for the highly regarded and expensive A123 cells. lithium iron phosphate batteries using prismatic cells are fairly new, so feedback is thin as yet. vs a long history of lithium polymer packs with the RC folks. NO one runs battery packs harder than the RC crowd. seems lithium poly packs are still chemistry of choice (for RC) due to higher energy density and just as important voltage compatibility with existing chargers/controllers. which leads back to why IHMO li-ion batteries in motorcycles should have some type of protection circuit to prevent overcharge. over discharge will kill any battery... lead acid and li-ion included. just that li-ion operates on a narrow voltage range that may be different from your bike's charging system. it's my intention to do high amp discharge tests at low temp with different chemistry. results of discharge tests with lithium iron phosphate will be especially relevant.