Features: 1. Safety: safest Lithium battery, CE UN approved, built-in PCM/BMS 2. Long life cycle:> 5000 times, 6-8 times of lead acid battery 3. Small size and light weight: 1/2 size& weight of lead acid battery 4. Low self-discharge rate: < 3% monthly 5. Easy to connection: Can be replaced directly, all case made by customer's requirements