It's early days, but the new East Power 4200 MII cell seems to be close to the IB in terms of voltage and also a lot more reliable. Good value too.
Much-More Racing UK are now supplying them to the UK shops.
The first batch they got in doesn't suffer from the dead cell issues the IB's do (as many as 10% of factory fresh IB's are down to 0V by the time the reach the distributors, a lot of the cells can be brought back to life without any long term effects but it is still less than ideal).
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