Field notes from the MEHAR application engineering desk: chemistry selection, BMS behaviour, cycle life under real Indian duty cycles, and the specification decisions that determine whether a commercial pack survives its warranty.
NMC buys you energy density. LFP buys you roughly twice the cycle life. For a delivery fleet running two charges a day, that trade decides the economics — and our own catalogue shows the gap clearly.
An IP rating is two independent digits, not one quality score. Over-specifying costs money and weight; under-specifying costs you the pack. How to match the rating to where the battery actually sits.
A cycle life rating is meaningless without the depth of discharge it was measured at. Two packs quoting 3,000 cycles can differ by years of service life. Here is how to read the spec properly.
A BMS protects the pack. Telemetry tells you what it is doing. Which protocol you specify determines whether you find out about a failing cell before or after it strands a vehicle.
