The outer layer of the E-wheelchair battery is made of waterproof ABS material, which is insulated, anti-corrosive and wear-resistant. The inner layer has the advantages of low melting point, waterproof sealing, high adhesion, etc. Good safety performance, long service life, strong power, internal BMS protection, prevention of overcharge, overdischarge, overcurrent and short circuit, temperature control protection, balanced management and other functions. If you have any questions, please contact us. We are happy to serve you. [Product Details]: Model: lithium battery Nominal voltage: 24V Nominal capacity: 15Ah 18AH 20AH 25AH 30AH Battery size: 240 190 115mm Charger : 29.4V 2A Cycle life: more than 800 1000 times Safety precautions: Please check your device model and original battery size before buying. If you are not sure or the size of your electric wheelchair is inconsistent, please contact customer service. We can customize the size for you. Although the battery is designed to be waterproof and can be used in rainy days, please do not immerse the battery in water.After install the electirc bike battery according to the instrution manual, please recharge the lithium battery to fully before you use. We can offer the cable you need, if the connector is different according to your needs, contact us please. The Lithium ion battery capacity is recycled 800 1000 times, which is more environmentally friendly and lighter than ferric acid batteries.High battery capacity and density, good safety performance. Wheelchair battery use BMS protection, preventing overcharge, overdischarge, overcurrent and short circuit, temperature control protection, balanced management and other functions. The outer layer of the wheelchair battery pack is made of waterproof ABS material, which is insulated, anti-corrosion and wear-resistant. Make the battery can be use even in rainy day. Lithium battery is 24V 15Ah 18AH 20AH 25AH 30AH, suitable for 50-750W motor. Size: 240 190 115mm. Charger: 29.4V 2A.