Make tighter mv celldiff for pylon #2246

Job	Run time
build-batteries (esp32:esp32:esp32, BMW_I3_BATTERY, BYD_CAN)	2m 32s
build-batteries (esp32:esp32:esp32, BYD_ATTO_3_BATTERY, BYD_CAN)	2m 31s
build-batteries (esp32:esp32:esp32, CHADEMO_BATTERY, BYD_CAN)	2m 32s
build-batteries (esp32:esp32:esp32, IMIEV_CZERO_ION_BATTERY, BYD_CAN)	2m 32s
build-batteries (esp32:esp32:esp32, JAGUAR_IPACE_BATTERY, BYD_CAN)	2m 26s
build-batteries (esp32:esp32:esp32, KIA_HYUNDAI_64_BATTERY, BYD_CAN)	2m 45s
build-batteries (esp32:esp32:esp32, KIA_HYUNDAI_HYBRID_BATTERY, BYD_CAN)	2m 33s
build-batteries (esp32:esp32:esp32, NISSAN_LEAF_BATTERY, BYD_CAN)	2m 32s
build-batteries (esp32:esp32:esp32, PYLON_BATTERY, BYD_CAN)	2m 28s
build-batteries (esp32:esp32:esp32, RJXZS_BMS, BYD_CAN)	2m 29s
build-batteries (esp32:esp32:esp32, RENAULT_KANGOO_BATTERY, BYD_CAN)	2m 24s
build-batteries (esp32:esp32:esp32, RENAULT_ZOE_GEN1_BATTERY, BYD_CAN)	2m 44s
build-batteries (esp32:esp32:esp32, RENAULT_ZOE_GEN2_BATTERY, BYD_CAN)	2m 31s
build-batteries (esp32:esp32:esp32, TESLA_MODEL_3Y_BATTERY, BYD_CAN)	2m 29s
build-batteries (esp32:esp32:esp32, VOLVO_SPA_BATTERY, BYD_CAN)	2m 25s
build-batteries (esp32:esp32:esp32, TEST_FAKE_BATTERY, BYD_CAN)	2m 33s
build-batteries (esp32:esp32:esp32, SERIAL_LINK_RECEIVER, BYD_CAN)	2m 31s
	42m 57s

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