My Sherman had electronics in too, after 5 minutes it would stop working. I didn't care, I had planned on replacing the guts from the beginning. I've never had problems with my other Heng Long tanks from Mato
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HL Panzer III | HL Tiger | HL Jagdpanther | HL Panther | Mato Sherman
Hooben Elefant | HL Pershing | HL Bergepanzer IV | Tamiya Leopard 1A | WSN T-34
HL "Golden" Pan-Tiger | M16 Halftrack | HL Panzer IV | Tamiya KV-1 | Tamiya Tiger