BBS02 surge/deceleration

Converted 1993 Stumpjumper to have Bafang BBS02 750 W with Hailong 48 V battery

Symptoms:

Mostly: surging/deceleration at level 2 (or any other level). Charge level drops, increases without heavy loading – even at coasting.

Occasionally: powers off when coming to a stop.

Noted: powering up: display sometimes takes long time (10+ secs) to indicate full charge.

Actions taken:

Tested Battery: full voltage

Cleaned: Connectors with topical fluid cleaner

Mounted on bike stand for testing after cleaning connectors: power up normal, stepping for 0-5 ok.

After bike stand test, road test. Fails with surging/deceleration, and charge level drops, increases without heavy loading.

Suggestions????

Additional questions: is there an inexpensive controller tester that can test Bafang’s controller such as

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